Generic selectors
Exact matches only
Search in title
Search in content
Post Type Selectors

MyMCQs

Facebook Instagram Youtube Linkedin
Submit Mcqs

MyMCQs

Generic selectors
Exact matches only
Search in title
Search in content
Post Type Selectors
Generic selectors
Exact matches only
Search in title
Search in content
Post Type Selectors

MyMcqs

Submit Mcqs

ENVIRONMENTAL SCIENCE ONE LINER MCQS

ENVIRONMENTAL SCIENCE ONE LINER MCQS  explores the relationship between humans and nature. These one-liner MCQs highlight essential topics such as pollution, climate change, biodiversity, and natural resources. Understanding environmental concepts helps students and aspirants analyze how human actions affect the planet. Moreover, these short questions simplify complex topics like ecosystems, renewable energy, and conservation practices. Whether you’re preparing for general science tests or environmental studies exams, mastering these one-liners boosts your confidence and conceptual clarity. Practice daily to strengthen your environmental knowledge and develop awareness about sustainability and ecological balance.

ENVIRONMENTAL SCIENCE ONE LINER MCQS

Environmental Science Basic One Liner MCQs

Short Paragraph:
ENVIRONMENTAL SCIENCE ONE LINER MCQS  is the study of the interactions between humans and the natural world. It examines ecosystems, pollution, conservation, and sustainability. The subject helps us understand environmental challenges like climate change, deforestation, and waste management.

    1. What is the study of the environment and its interactions called?
      Answer: Environmental Science

    2. Which gas is primarily responsible for global warming?
      Answer: Carbon dioxide

    3. The ozone layer protects us from:
      Answer: Ultraviolet radiation

    4. The main cause of deforestation is:
      Answer: Human activity

    5. Renewable energy includes:
      Answer: Solar energy

    6. Non-renewable energy source is:
      Answer: Coal

    7. The process of reusing waste material is called:
      Answer: Recycling

    8. The study of relationships between organisms and their environment is called:
      Answer: Ecology

    9. Which of these is a greenhouse gas?
      Answer: Methane

    10. The most abundant gas in Earth’s atmosphere is:
      Answer: Nitrogen

    11. Acid rain is caused by emissions of:
      Answer: Sulphur dioxide and nitrogen oxides

    12. The layer of the atmosphere where weather occurs is:
      Answer: Troposphere

    13. The term “biodiversity” refers to:
      Answer: Variety of life forms

    14. The main source of freshwater is:
      Answer: Rivers

    15. A species that no longer exists is said to be:
      Answer: Extinct

    16. The process of planting trees to restore forests is:
      Answer: Afforestation

    17. The natural home of an organism is its:
      Answer: Habitat

    18. Noise pollution is measured in:
      Answer: Decibels

    19. The main cause of soil erosion is:
      Answer: Deforestation

    20. Which organization focuses on environmental protection worldwide?
      Answer: UNEP (United Nations Environment Programme)

Short Paragraph:
ENVIRONMENTAL SCIENCE ONE LINER MCQS  studies human-environment interactions, sustainability, pollution control, and biodiversity conservation.

  1. The layer of atmosphere that protects Earth from meteoroids is:
    Answer: Mesosphere
    Explanation: Meteoroids burn up in the mesosphere due to friction with air.

  2. Biodegradable waste is:
    Answer: Can be decomposed naturally
    Explanation: Organic matter like food scraps decomposes through microbes.

  3. The term “ecology” was coined by:
    Answer: Ernst Haeckel
    Explanation: Ecology studies organisms and their environment.

  4. Eutrophication is caused by:
    Answer: Excess nutrients in water
    Explanation: Leads to algal blooms and oxygen depletion.

  5. Acidification of oceans is due to:
    Answer: CO₂ absorption
    Explanation: Increased CO₂ lowers pH, harming marine life.

  6. Soil fertility can be improved by:
    Answer: Composting
    Explanation: Organic matter replenishes nutrients in soil.

  7. Renewable energy not dependent on weather is:
    Answer: Geothermal
    Explanation: Geothermal energy comes from Earth’s heat.

  8. The ozone hole is mainly over:
    Answer: Antarctica
    Explanation: CFCs have caused ozone depletion in polar regions.

  9. Biomes are classified based on:
    Answer: Climate and vegetation
    Explanation: Temperature and rainfall determine biome types.

  10. Overfishing leads to:
    Answer: Decreased fish populations
    Explanation: Unsustainable fishing disrupts aquatic ecosystems.

  11. The largest freshwater reservoir is:
    Answer: Ice caps and glaciers
    Explanation: Polar ice holds most of Earth’s freshwater.

  12. Climate change impacts include:
    Answer: Sea level rise and extreme weather
    Explanation: Global warming melts ice and alters weather patterns.

  13. Endangered species are:
    Answer: At risk of extinction
    Explanation: Populations decline due to habitat loss, hunting, or pollution.

  14. The main cause of desertification is:
    Answer: Deforestation and overgrazing
    Explanation: Soil degradation and vegetation loss turn land into desert.

  15. Water pollution can be caused by:
    Answer: Industrial effluents
    Explanation: Toxic chemicals contaminate rivers and lakes.

  16. Noise pollution affects:
    Answer: Hearing and health
    Explanation: Long-term exposure can cause stress and hearing loss.

  17. Green buildings are designed to:
    Answer: Save energy and resources
    Explanation: They minimize environmental impact.

  18. Biodiversity hotspot means:
    Answer: Area rich in species and under threat
    Explanation: High species diversity and vulnerability define hotspots.

  19. Biomagnification refers to:
    Answer: Increasing toxin concentration up the food chain
    Explanation: Harmful chemicals accumulate in predators at higher levels.

  20. The main aim of sustainable development is:
    Answer: Meet present needs without harming future
    Explanation: It balances economic, social, and environmental goals.

Short Paragraph:
ENVIRONMENTAL SCIENCE ONE LINER MCQS  studies human-environment interactions, sustainability, pollution control, and biodiversity conservation.

  1. The layer of atmosphere that protects Earth from meteoroids is:
    Answer: Mesosphere
    Explanation: Meteoroids burn up in the mesosphere due to friction with air.

  2. Biodegradable waste is:
    Answer: Can be decomposed naturally
    Explanation: Organic matter like food scraps decomposes through microbes.

  3. The term “ecology” was coined by:
    Answer: Ernst Haeckel
    Explanation: Ecology studies organisms and their environment.

  4. Eutrophication is caused by:
    Answer: Excess nutrients in water
    Explanation: Leads to algal blooms and oxygen depletion.

  5. Acidification of oceans is due to:
    Answer: CO₂ absorption
    Explanation: Increased CO₂ lowers pH, harming marine life.

  6. Soil fertility can be improved by:
    Answer: Composting
    Explanation: Organic matter replenishes nutrients in soil.

  7. Renewable energy not dependent on weather is:
    Answer: Geothermal
    Explanation: Geothermal energy comes from Earth’s heat.

  8. The ozone hole is mainly over:
    Answer: Antarctica
    Explanation: CFCs have caused ozone depletion in polar regions.

  9. Biomes are classified based on:
    Answer: Climate and vegetation
    Explanation: Temperature and rainfall determine biome types.

  10. Overfishing leads to:
    Answer: Decreased fish populations
    Explanation: Unsustainable fishing disrupts aquatic ecosystems.

  11. The largest freshwater reservoir is:
    Answer: Ice caps and glaciers
    Explanation: Polar ice holds most of Earth’s freshwater.

  12. Climate change impacts include:
    Answer: Sea level rise and extreme weather
    Explanation: Global warming melts ice and alters weather patterns.

  13. Endangered species are:
    Answer: At risk of extinction
    Explanation: Populations decline due to habitat loss, hunting, or pollution.

  14. The main cause of desertification is:
    Answer: Deforestation and overgrazing
    Explanation: Soil degradation and vegetation loss turn land into desert.

  15. Water pollution can be caused by:
    Answer: Industrial effluents
    Explanation: Toxic chemicals contaminate rivers and lakes.

  16. Noise pollution affects:
    Answer: Hearing and health
    Explanation: Long-term exposure can cause stress and hearing loss.

  17. Green buildings are designed to:
    Answer: Save energy and resources
    Explanation: They minimize environmental impact.

  18. Biodiversity hotspot means:
    Answer: Area rich in species and under threat
    Explanation: High species diversity and vulnerability define hotspots.

  19. Biomagnification refers to:
    Answer: Increasing toxin concentration up the food chain
    Explanation: Harmful chemicals accumulate in predators at higher levels.

  20. The main aim of sustainable development is:
    Answer: Meet present needs without harming future
    Explanation: It balances economic, social, and environmental goals.

Short Paragraph:
ENVIRONMENTAL SCIENCE ONE LINER MCQS  studies human-environment interactions, sustainability, pollution control, and biodiversity conservation.

  1. The layer of atmosphere that protects Earth from meteoroids is:
    Answer: Mesosphere
    Explanation: Meteoroids burn up in the mesosphere due to friction with air.

  2. Biodegradable waste is:
    Answer: Can be decomposed naturally
    Explanation: Organic matter like food scraps decomposes through microbes.

  3. The term “ecology” was coined by:
    Answer: Ernst Haeckel
    Explanation: Ecology studies organisms and their environment.

  4. Eutrophication is caused by:
    Answer: Excess nutrients in water
    Explanation: Leads to algal blooms and oxygen depletion.

  5. Acidification of oceans is due to:
    Answer: CO₂ absorption
    Explanation: Increased CO₂ lowers pH, harming marine life.

  6. Soil fertility can be improved by:
    Answer: Composting
    Explanation: Organic matter replenishes nutrients in soil.

  7. Renewable energy not dependent on weather is:
    Answer: Geothermal
    Explanation: Geothermal energy comes from Earth’s heat.

  8. The ozone hole is mainly over:
    Answer: Antarctica
    Explanation: CFCs have caused ozone depletion in polar regions.

  9. Biomes are classified based on:
    Answer: Climate and vegetation
    Explanation: Temperature and rainfall determine biome types.

  10. Overfishing leads to:
    Answer: Decreased fish populations
    Explanation: Unsustainable fishing disrupts aquatic ecosystems.

  11. The largest freshwater reservoir is:
    Answer: Ice caps and glaciers
    Explanation: Polar ice holds most of Earth’s freshwater.

  12. Climate change impacts include:
    Answer: Sea level rise and extreme weather
    Explanation: Global warming melts ice and alters weather patterns.

  13. Endangered species are:
    Answer: At risk of extinction
    Explanation: Populations decline due to habitat loss, hunting, or pollution.

  14. The main cause of desertification is:
    Answer: Deforestation and overgrazing
    Explanation: Soil degradation and vegetation loss turn land into desert.

  15. Water pollution can be caused by:
    Answer: Industrial effluents
    Explanation: Toxic chemicals contaminate rivers and lakes.

  16. Noise pollution affects:
    Answer: Hearing and health
    Explanation: Long-term exposure can cause stress and hearing loss.

  17. Green buildings are designed to:
    Answer: Save energy and resources
    Explanation: They minimize environmental impact.

  18. Biodiversity hotspot means:
    Answer: Area rich in species and under threat
    Explanation: High species diversity and vulnerability define hotspots.

  19. Biomagnification refers to:
    Answer: Increasing toxin concentration up the food chain
    Explanation: Harmful chemicals accumulate in predators at higher levels.

  20. The main aim of sustainable development is:
    Answer: Meet present needs without harming future
    Explanation: It balances economic, social, and environmental goals.

Short Paragraph:

These Environmental Science one liner mcqs examines the interactions between humans and the natural world, focusing on ecosystems, resources, pollution, and sustainability.

  1. The largest reservoir of freshwater is:
    Answer: Glaciers
    Explanation: Most freshwater is stored as ice.
  2. Which gas causes acid rain?
    Answer: Sulfur dioxide
    Explanation: SO₂ reacts with water to form acids.
  3. Which layer contains the ozone layer?
    Answer: Stratosphere
    Explanation: It absorbs harmful UV rays.
  4. A species that is at high risk of extinction is called:
    Answer: Endangered
    Explanation: Such species need protection.
  5. Primary air pollutant from vehicle exhaust is:
    Answer: Carbon monoxide
    Explanation: CO is produced by incomplete combustion.
  6. The main cause of eutrophication is:
    Answer: Excess nutrients
    Explanation: Nitrates and phosphates cause algal blooms.
  7. Renewable resource among the following is:
    Answer: Wind energy
    Explanation: Naturally replenished by wind.
  8. Which process converts waste into useful products?
    Answer: Recycling
    Explanation: It reduces environmental burden.
  9. The branch that studies climate is:
    Answer: Climatology
    Explanation: It focuses on long-term weather patterns.
  10. Deforestation affects:
    Answer: Soil fertility
    Explanation: Trees prevent soil erosion.
  11. Solar radiation reflected back to space is:
    Answer: Albedo
    Explanation: High-albedo surfaces reflect more sunlight.
  12. Which gas is responsible for photochemical smog?
    Answer: Nitrogen oxides
    Explanation: NOx reacts with sunlight and pollutants.
  13. Water purification method includes:
    Answer: Filtration
    Explanation: Removes impurities and particles.
  14. Urban heat island effect occurs due to:
    Answer: Concrete surfaces
    Explanation: They absorb and retain heat.
  15. An organism that shows air quality is:
    Answer: Lichen
    Explanation: Sensitive to pollution, used as bioindicator.
  16. Composting converts waste into:
    Answer: Organic fertilizer
    Explanation: Decomposition produces nutrient-rich compost.
  17. The main cause of desertification is:
    Answer: Overgrazing
    Explanation: Exposes soil and reduces vegetation.
  18. The study of soil is called:
    Answer: Pedology
    Explanation: Deals with soil formation and morphology.
  19. Green buildings focus on:
    Answer: Energy efficiency
    Explanation: Designed to reduce environmental impact.
  20. The Earth Summit was held in:
    Answer: Rio de Janeiro
    Explanation: It focused on sustainable development (1992).

Short Paragraph:

Environmental Science one liner mcqs studies the interaction between humans and the environment, focusing on pollution, ecosystems, sustainability, and resource management.

  1. The thinning of the ozone layer is called:
    Answer: Ozone depletion
    Explanation: Caused mainly by CFCs.
  2. Major cause of air pollution in cities is:
    Answer: Vehicle emissions
    Explanation: Cars emit harmful gases like CO and NOx.
  3. The study of interactions between organisms and environment is:
    Answer: Ecology
    Explanation: Deals with relationships in ecosystems.
  4. Which energy source is non-renewable?
    Answer: Coal
    Explanation: Formed over millions of years, cannot renew quickly.
  5. The main component of natural gas is:
    Answer: Methane
    Explanation: CH₄ is the dominant gas.
  6. The process of converting waste into energy is called:
    Answer: Waste-to-energy
    Explanation: Waste burned to generate electricity.
  7. Which disaster results from movement of Earth’s crust?
    Answer: Earthquake
    Explanation: Caused by tectonic activity.
  8. The amount of water vapor in the air is:
    Answer: Humidity
    Explanation: Indicates moisture content.
  9. Which is biodegradable waste?
    Answer: Paper
    Explanation: Can be decomposed naturally.
  10. Largest producer of oxygen in the world is:
    Answer: Phytoplankton
    Explanation: Ocean plants produce most O₂.
  11. The main cause of global water pollution is:
    Answer: Industrial discharge
    Explanation: Toxic chemicals pollute water bodies.
  12. The gradual increase in Earth’s temperature is:
    Answer: Global warming
    Explanation: Caused by greenhouse gases.
  13. A group of organisms of same species in an area is:
    Answer: Population
    Explanation: Members share the same habitat.
  14. The process of removing salt from seawater is:
    Answer: Desalination
    Explanation: Produces freshwater from seawater.
  15. Which greenhouse gas is strongest per molecule?
    Answer: Methane
    Explanation: Has more heat-trapping ability than CO₂.
  16. Planting trees on large scale is called:
    Answer: Afforestation
    Explanation: Increases forest cover.
  17. Water cycle involves evaporation, condensation, and:
    Answer: Precipitation
    Explanation: Falls as rain or snow.
  18. Non-metal pollutant in agriculture water is:
    Answer: Nitrate
    Explanation: Comes from fertilizers.
  19. WHO stands for:
    Answer: World Health Organization
    Explanation: Works for global health and environment.
  20. The largest source of renewable energy worldwide is:
    Answer: Hydropower
    Explanation: Uses water for electricity.

Short Paragraph:

ENVIRONMENTAL SCIENCE ONE LINER MCQS  studies ecosystems, climate, pollution, energy resources, and human impacts on the natural world.

  1. The main source of indoor air pollution is:
    Answer: Smoke from cooking
    Explanation: It releases harmful particulate matter.
  2. The term for the variety of ecosystems in an area is:
    Answer: Ecological diversity
    Explanation: It includes forests, grasslands, wetlands, etc.
  3. The largest freshwater resource on Earth is:
    Answer: Glaciers
    Explanation: Most freshwater is stored as ice.
  4. The process of breaking down rocks by natural forces is:
    Answer: Weathering
    Explanation: Wind, water, temperature cause breakdown.
  5. A device used to measure air quality is:
    Answer: AQI sensor
    Explanation: AQI indicates pollution levels.
  6. The major cause of ocean acidification is:
    Answer: Excess CO₂
    Explanation: CO₂ dissolves in oceans, forming carbonic acid.
  7. The gas responsible for acid rain is:
    Answer: Sulfur dioxide
    Explanation: SO₂ reacts with water forming acidic compounds.
  8. The most environment-friendly fuel is:
    Answer: Hydrogen
    Explanation: Its combustion produces only water.
  9. Recycling of paper helps reduce:
    Answer: Deforestation
    Explanation: Less wood is cut when paper is reused.
  10. The layer responsible for weather changes is:
    Answer: Troposphere
    Explanation: It contains 75% atmospheric gases.
  11. Deforestation mainly leads to:
    Answer: Soil erosion
    Explanation: Roots that hold soil get removed.
  12. A species found only in one region is called:
    Answer: Endemic
    Explanation: Found nowhere else on Earth.
  13. Which renewable energy works at night?
    Answer: Wind energy
    Explanation: Wind turbines work whenever wind blows.
  14. The largest source of water pollution is:
    Answer: Industrial waste
    Explanation: Factories release chemicals into rivers.
  15. The study of interactions among organisms and environment is:
    Answer: Ecology
    Explanation: Examines relationships in ecosystems.
  16. Which country produces the most solar energy?
    Answer: China
    Explanation: It leads in global solar capacity.
  17. Green buildings use:
    Answer: Energy-efficient materials
    Explanation: They reduce heat loss and power use.
  18. The main pollutant from vehicles is:
    Answer: Carbon monoxide
    Explanation: Incomplete combustion produces CO.
  19. A sudden shortage of rainfall is called:
    Answer: Drought
    Explanation: Leads to crop failure and water scarcity.
  20. Nitrogen fixation in soil is done by:
    Answer: Rhizobium bacteria
    Explanation: They convert nitrogen gas into usable form.

Short Paragraph:

ENVIRONMENTAL SCIENCE ONE LINER MCQS  deals with climate, pollution, ecosystems, biodiversity, and how human activities affect the natural environment.

  1. The main gas responsible for ozone layer depletion is:
    Answer: CFCs
    Explanation: Chlorofluorocarbons break ozone molecules.
  2. The most efficient renewable energy source in coastal areas is:
    Answer: Tidal energy
    Explanation: Uses ocean tides for electricity.
  3. The study of soil organisms is called:
    Answer: Soil biology
    Explanation: It studies microorganisms living in soil.
  4. Drinking water quality is measured by:
    Answer: pH level
    Explanation: Indicates acidity or alkalinity.
  5. Which pollutant is responsible for respiratory diseases?
    Answer: Particulate matter
    Explanation: PM2.5 penetrates deep into lungs.
  6. The process of planting trees on non-forest land is:
    Answer: Afforestation
    Explanation: Adds new forest areas.
  7. Which energy source emits zero carbon during use?
    Answer: Solar energy
    Explanation: Produces electricity without pollution.
  8. The main factor causing species endangerment is:
    Answer: Habitat loss
    Explanation: Due to human activities like agriculture.
  9. Which of the following is biodegradable waste?
    Answer: Paper
    Explanation: Naturally decomposes.
  10. The term “carbon footprint” refers to:
    Answer: Total greenhouse emissions
    Explanation: From an individual or activity.
  11. The gas responsible for photochemical smog is:
    Answer: Nitrogen oxide
    Explanation: Forms smog under sunlight.
  12. The earth’s protective outermost layer is:
    Answer: Atmosphere
    Explanation: Shields from harmful radiation.
  13. The process of converting waste into usable materials is:
    Answer: Recycling
    Explanation: Reduces pollution and saves resources.
  14. Which ecosystem covers the largest area on Earth?
    Answer: Ocean ecosystem
    Explanation: Oceans cover 70% of planet.
  15. Water with dissolved salts is called:
    Answer: Saline water
    Explanation: Found in seas and oceans.
  16. Which is a greenhouse gas?
    Answer: Methane
    Explanation: Potent heat-trapping gas.
  17. The study of weather patterns is called:
    Answer: Meteorology
    Explanation: Deals with daily atmospheric conditions.
  18. Which pollutant destroys aquatic life by reducing oxygen?
    Answer: Sewage
    Explanation: Increases bacterial activity, reducing oxygen.
  19. Noise above 120 dB causes:
    Answer: Immediate pain
    Explanation: Extremely harmful to ears.
  20. The international day focused on environment is:
    Answer: June 5
    Explanation: Celebrated as World Environment Day.

Short Paragraph:

ENVIRONMENTAL SCIENCE ONE LINER MCQS  examines air, water, land, climate, energy, pollution, and how humans impact and manage the environment sustainably.

  1. Which gas forms the largest portion of the atmosphere?
    Answer: Nitrogen
    Explanation: Makes up about 78% of air.
  2. The main cause of eutrophication is:
    Answer: Excess fertilizers
    Explanation: Causes algal blooms that kill aquatic life.
  3. Which layer protects Earth from meteoroids?
    Answer: Mesosphere
    Explanation: Burns incoming meteors.
  4. The natural disaster caused by movement of tectonic plates is:
    Answer: Earthquake
    Explanation: Occurs due to shifting crust plates.
  5. The process of converting waste into energy is:
    Answer: Waste-to-energy
    Explanation: Produces electricity or heat.
  6. Which is the cleanest fossil fuel?
    Answer: Natural gas
    Explanation: Emits least carbon compared to coal and oil.
  7. The study of ancient climates is called:
    Answer: Paleoclimatology
    Explanation: Uses fossils and sediments to study past climates.
  8. Carbon monoxide is produced by:
    Answer: Incomplete combustion
    Explanation: Lack of oxygen produces CO.
  9. The natural process of water movement in the atmosphere is:
    Answer: Water cycle
    Explanation: Includes evaporation, condensation, precipitation.
  10. Which gas is responsible for global warming mainly?
    Answer: Carbon dioxide
    Explanation: Major greenhouse gas.
  11. The term for loss of tree cover in large areas is:
    Answer: Deforestation
    Explanation: Reduces biodiversity and increases erosion.
  12. Soil rich in humus is:
    Answer: Fertile soil
    Explanation: Contains decayed organic matter.
  13. Fish die in polluted water mainly due to lack of:
    Answer: Oxygen
    Explanation: Pollution reduces dissolved oxygen levels.
  14. Which energy source comes from Earth’s interior heat?
    Answer: Geothermal energy
    Explanation: Steam from Earth’s crust generates power.
  15. A species introduced in a new habitat is called:
    Answer: Invasive species
    Explanation: They spread rapidly and harm ecosystems.
  16. The study of birds is:
    Answer: Ornithology
    Explanation: Branch of environmental and biological sciences.
  17. Which pollution cannot be seen but can be heard?
    Answer: Noise pollution
    Explanation: Excess sound harmful to health.
  18. Rivers drying due to dams is an example of:
    Answer: Habitat alteration
    Explanation: Human actions change natural habitats.
  19. Which gas protects from UV radiation?
    Answer: Ozone
    Explanation: Found in the stratosphere.
  20. Lead pollution mainly affects the:
    Answer: Nervous system
    Explanation: Causes brain and developmental issues.

🌍 Short Paragraph:

ENVIRONMENTAL SCIENCE ONE LINER MCQS  studies interactions between humans and the natural world, focusing on climate, pollution, energy use, ecosystems, and conservation.

  1. The main cause of acid rain is:
    Answer: Sulfur dioxide
    Explanation: SO₂ reacts with water vapor to form sulfuric acid.
  2. Which gas absorbs harmful UV radiation?
    Answer: Ozone
    Explanation: The ozone layer protects Earth from UV rays.
  3. Deforestation mainly leads to:
    Answer: Soil erosion
    Explanation: Tree roots prevent soil from washing away.
  4. The main source of freshwater on Earth is:
    Answer: Glaciers
    Explanation: Most freshwater is locked in ice.
  5. Primary consumers are:
    Answer: Herbivores
    Explanation: They feed directly on plants.
  6. The process of turning waste into new products is:
    Answer: Recycling
    Explanation: It reduces waste and pollution.
  7. Noise pollution mainly affects the:
    Answer: Nervous system
    Explanation: High noise levels cause stress and hearing issues.
  8. The major component of air is:
    Answer: Nitrogen
    Explanation: It makes up about 78% of Earth’s atmosphere.
  9. Biodegradable waste includes:
    Answer: Food waste
    Explanation: It decomposes naturally through microbes.
  10. Which gas is responsible for acidification of oceans?
    Answer: Carbon dioxide
    Explanation: CO₂ forms carbonic acid in seawater.
  11. EIA stands for:
    Answer: Environmental Impact Assessment
    Explanation: It evaluates environmental effects of projects.
  12. A species found only in one area is called:
    Answer: Endemic
    Explanation: Endemic species have restricted habitats.
  13. The depletion of forests is known as:
    Answer: Deforestation
    Explanation: Cutting trees reduces biodiversity.
  14. Green algae belong to which kingdom?
    Answer: Protista
    Explanation: Many algae are part of the Protista kingdom.
  15. The study of relationships between organisms and environment is:
    Answer: Ecology
    Explanation: Ecology analyzes interactions within ecosystems.
  16. Water pollution due to fertilizer runoff causes:
    Answer: Eutrophication
    Explanation: Extra nutrients cause algal bloom and oxygen loss.
  17. Which renewable resource is the most widely used?
    Answer: Hydropower
    Explanation: Water energy is a major renewable source worldwide.
  18. The layer of gases surrounding Earth is called:
    Answer: Atmosphere
    Explanation: It protects life and supports climate.
  19. Green buildings aim to reduce:
    Answer: Energy consumption
    Explanation: They use eco-friendly materials and designs.

🌍 Short Paragraph:

ENVIRONMENTAL SCIENCE ONE LINER MCQS  examines ecosystems, pollution, climate, energy, and conservation to protect the environment and ensure sustainable development.

  1. The major cause of ozone layer depletion is:
    Answer: CFCs
    Explanation: Chlorofluorocarbons release chlorine that breaks ozone.
  2. The process of plant loss due to overgrazing is called:
    Answer: Desertification
    Explanation: Soil becomes dry and unproductive.
  3. The main pollutant from vehicles is:
    Answer: Carbon monoxide
    Explanation: CO is produced by incomplete fuel combustion.
  4. The term “ecotone” refers to:
    Answer: Transition zone between ecosystems
    Explanation: It contains species from both nearby ecosystems.
  5. Which water pollutant causes blue-baby syndrome?
    Answer: Nitrates
    Explanation: High nitrate levels reduce oxygen in infant blood.
  6. The largest freshwater lake by volume is:
    Answer: Lake Baikal
    Explanation: It holds the most freshwater on Earth.
  7. The heat trapped in Earth’s atmosphere is known as:
    Answer: Greenhouse effect
    Explanation: Greenhouse gases retain heat.
  8. Which solid waste is biodegradable?
    Answer: Cotton cloth
    Explanation: Cotton decomposes naturally.
  9. The layer directly above the troposphere is:
    Answer: Stratosphere
    Explanation: It contains the ozone layer.
  10. The main source of indoor air pollution is:
    Answer: Biomass burning
    Explanation: Wood and coal release harmful particles indoors.
  11. E-waste primarily contains:
    Answer: Heavy metals
    Explanation: Lead, mercury, and cadmium pollute soil and water.
  12. The cleanest renewable energy source is:
    Answer: Solar energy
    Explanation: Solar produces no emissions during use.
  13. The process of water passing through soil and rock is:
    Answer: Percolation
    Explanation: Water infiltrates underground layers.
  14. A species that indicates environmental changes is called:
    Answer: Indicator species
    Explanation: Frogs, lichens show pollution levels.
  15. The Rio Summit focused on:
    Answer: Sustainable development
    Explanation: Held in 1992 to protect the environment.
  16. The most abundant greenhouse gas is:
    Answer: Water vapor
    Explanation: It naturally regulates Earth’s temperature.
  17. Which disaster is measured using the Richter scale?
    Answer: Earthquake
    Explanation: Richter scale measures earthquake magnitude.
  18. Which ecosystem has the fastest nutrient recycling?
    Answer: Tropical rainforest
    Explanation: Warm, moist conditions speed decomposition.
  19. What does “biomass energy” use?
    Answer: Organic matter
    Explanation: It includes wood, crops, and waste.

🌍 Short Paragraph:

ENVIRONMENTAL SCIENCE ONE LINER MCQS  studies ecosystems, air, water, soil, energy, pollution, and the impact of human activities on the planet for sustainable living.

  1. The main source of outdoor air pollution in cities is:
    Answer: Vehicular emissions
    Explanation: Cars release CO, NOx, PM, causing smog.
  2. Which gas causes the “acid fog” phenomenon?
    Answer: Sulfur dioxide
    Explanation: SO₂ mixes with fog moisture to form acidic droplets.
  3. The most common greenhouse gas emitted by humans is:
    Answer: CO₂
    Explanation: Burning fossil fuels releases carbon dioxide.
  4. The “lungs of the Earth” are:
    Answer: Forests
    Explanation: They produce oxygen and absorb CO₂.
  5. Which energy is produced from organic waste?
    Answer: Biogas
    Explanation: Anaerobic microbes convert waste into methane.
  6. A species with a huge impact on ecosystem balance is:
    Answer: Keystone species
    Explanation: Removing it disrupts the entire ecosystem.
  7. The contamination of water with nutrients leads to:
    Answer: Algal bloom
    Explanation: Excess nutrients cause rapid algae growth.
  8. Which radiation is responsible for skin cancer?
    Answer: UV-B
    Explanation: UV-B rays damage DNA in skin cells.
  9. The most abundant pollutant in photochemical smog is:
    Answer: Ozone
    Explanation: Ground-level ozone forms due to sunlight + pollutants.
  10. Oceans absorb about what percentage of atmospheric CO₂?
    Answer: 30%
    Explanation: Oceans act as major carbon sinks.
  11. Which device reduces vehicle emissions?
    Answer: Catalytic converter
    Explanation: Converts harmful gases into less toxic ones.
  12. The study of animal behavior in natural habitats is:
    Answer: Ethology
    Explanation: It examines behavior in ecosystems.
  13. The greatest water user worldwide is:
    Answer: Agriculture
    Explanation: Irrigation consumes the largest share.
  14. The measure of water cloudiness is called:
    Answer: Turbidity
    Explanation: Caused by suspended particles.
  15. The largest carbon reservoir on Earth is:
    Answer: Oceans
    Explanation: They store dissolved carbon.
  16. Which organisms first colonize barren areas?
    Answer: Pioneer species
    Explanation: They start ecological succession.
  17. The major effect of melting glaciers is:
    Answer: Rising sea levels
    Explanation: More meltwater increases ocean volume.
  18. Bioaccumulation refers to:
    Answer: Build-up of toxins in organisms
    Explanation: Toxins increase at each food chain level.
  19. The cleanest fossil fuel is:
    Answer: Natural gas
    Explanation: It produces fewer pollutants.
  20. The study of soil organisms is called:
    Answer: Soil biology
    Explanation: It examines microbes that maintain soil health.

🌍 Short Paragraph:

ENVIRONMENTAL SCIENCE ONE LINER MCQS  studies ecosystems, climate, natural resources, pollution, conservation, and sustainability to protect Earth’s systems.

  1. The main gas causing acid rain is:
    Answer: Sulfur dioxide
    Explanation: SO₂ reacts with water to form sulfuric acid.
  2. The study of climate is called:
    Answer: Climatology
    Explanation: It deals with long-term weather patterns.
  3. The main cause of ozone depletion is:
    Answer: CFCs
    Explanation: They destroy ozone molecules in the stratosphere.
  4. Which is the largest carbon reservoir?
    Answer: Oceans
    Explanation: They store most of Earth’s carbon.
  5. The layer where weather occurs is:
    Answer: Troposphere
    Explanation: Contains clouds and weather systems.
  6. Which energy source is cleanest?
    Answer: Solar
    Explanation: It produces zero air pollution.
  7. What is e-waste?
    Answer: Electronic waste
    Explanation: Old computers, mobiles, appliances.
  8. Desertification is caused by:
    Answer: Overgrazing
    Explanation: Removal of vegetation exposes soil.
  9. The main greenhouse gas is:
    Answer: CO₂
    Explanation: It contributes most to global warming.
  10. Which country emits the most carbon?
    Answer: China
    Explanation: Due to large industrial activity.
  11. The process of converting waste into reusable material is:
    Answer: Recycling
    Explanation: Reduces pollution and saves resources.
  12. Water pollution indicator:
    Answer: BOD
    Explanation: Measures dissolved oxygen needed by microbes.
  13. Biogas mainly contains:
    Answer: Methane
    Explanation: Produced by anaerobic digestion.
  14. Noise above 120 dB causes:
    Answer: Immediate pain
    Explanation: Extremely loud sound damages ears.
  15. The Amazon rainforest is called:
    Answer: Lungs of the Earth
    Explanation: Produces oxygen and absorbs CO₂.
  16. Which ecosystem has highest productivity?
    Answer: Wetlands
    Explanation: Highly productive and diverse.
  17. The study of soil is called:
    Answer: Pedology
    Explanation: Deals with soil formation, properties.
  18. The thinning of forests is called:
    Answer: Deforestation
    Explanation: Removal of trees for human use.
  19. Which pollutant causes smog?
    Answer: Nitrogen oxides
    Explanation: NOx reacts with sunlight to form smog.
  20. The region with reversed winds yearly:
    Answer: Monsoon
    Explanation: Seasonal wind pattern in South Asia.

🌍 Short Paragraph:

Environmental Science examines pollution, energy, climate, ecosystems, disasters, and actions for sustainability and conservation of Earth.

NEW 20 

  1. The main source of atmospheric methane is:
    Answer: Agriculture
    Explanation: Rice fields and livestock release methane.
  2. The study of living organisms and their environment is:
    Answer: Ecology
    Explanation: Focuses on interactions within ecosystems.
  3. The process of converting waste into energy is:
    Answer: Waste-to-energy
    Explanation: Trash is burned or processed for electricity.
  4. Which biome has permanently frozen soil?
    Answer: Tundra
    Explanation: Permafrost covers most of the soil.
  5. Major cause of coral bleaching:
    Answer: Rising ocean temperature
    Explanation: Heat forces corals to expel algae.
  6. Water purification through soil layers is called:
    Answer: Natural filtration
    Explanation: Soil acts as a filter.
  7. The loudness of sound is measured in:
    Answer: Decibels
    Explanation: Unit for noise levels.
  8. The biggest freshwater lake by volume:
    Answer: Lake Baikal
    Explanation: Holds 20% of Earth’s freshwater.
  9. Which pollution causes blue baby syndrome?
    Answer: Nitrate pollution
    Explanation: High nitrates reduce oxygen in infants.
  10. Which gas causes photochemical smog?
    Answer: Ozone
    Explanation: Formed when sunlight reacts with NOx and VOCs.
  11. The process that returns CO₂ to atmosphere:
    Answer: Respiration
    Explanation: Organisms release CO₂ when breaking down food.
  12. Which renewable energy uses flowing water?
    Answer: Hydropower
    Explanation: Dams convert energy of water into electricity.
  13. Land pollution due to chemicals is called:
    Answer: Soil contamination
    Explanation: Caused by pesticides, industrial waste.
  14. Marine pollution includes:
    Answer: Oil spills
    Explanation: Oil harms marine ecosystems.
  15. Which region receives the highest rainfall?
    Answer: Equatorial region
    Explanation: Due to high convectional rainfall.
  16. A species found only in one location is:
    Answer: Endemic
    Explanation: Restricted to a specific region.
  17. In which layer do satellites orbit?
    Answer: Exosphere
    Explanation: Outermost atmospheric layer.
  18. The process of planting trees on damaged land:
    Answer: Reforestation
    Explanation: Restores soil and biodiversity.
  19. The device measuring earthquakes:
    Answer: Seismograph
    Explanation: Records seismic waves.
  20. Sustainable development means?
    Answer: Meeting present needs without harming future
    Explanation: Ensures resources remain for future generations.

🌍 Short Paragraph:

Environmental Science studies Earth’s systems, pollution, biodiversity, climate, energy resources, and ways to conserve natural environments.

  1. The uppermost layer of soil is:
    Answer: Topsoil
    Explanation: Rich in nutrients and organic matter.
  2. Which gas is responsible for bad smell in sewage?
    Answer: Hydrogen sulfide
    Explanation: Produced from decomposing waste.
  3. Which cycle involves evaporation and precipitation?
    Answer: Water cycle
    Explanation: Moves water through atmosphere and land.
  4. The main cause of glacier melting is:
    Answer: Global warming
    Explanation: Rising temperatures speed up melting.
  5. An organism depending on multiple food sources is:
    Answer: Omnivore
    Explanation: Eats plants and animals.
  6. The main source of marine pollution:
    Answer: Plastic waste
    Explanation: Causes harm to aquatic animals.
  7. Which disaster occurs due to shifting tectonic plates?
    Answer: Earthquake
    Explanation: Plates collide or slide.
  8. The use of natural resources without wasting them is:
    Answer: Conservation
    Explanation: Ensures sustainable use.
  9. Water with high salt content is called:
    Answer: Saline water
    Explanation: Found in oceans.
  10. Which gas is released during volcanic eruptions?
    Answer: Sulfur dioxide
    Explanation: Contributes to acid rain.
  11. Which energy is obtained from Earth’s heat?
    Answer: Geothermal energy
    Explanation: Uses natural underground heat.
  12. Which process converts solar energy into chemical energy?
    Answer: Photosynthesis
    Explanation: In plants, sunlight forms glucose.
  13. Aquatic plants are called:
    Answer: Hydrophytes
    Explanation: Live fully or partially in water.
  14. A species with very small population is:
    Answer: Endangered
    Explanation: At high risk of extinction.
  15. Which pollution affects visibility?
    Answer: Air pollution
    Explanation: Smoke and dust reduce visibility.
  16. Which disease spreads through polluted water?
    Answer: Cholera
    Explanation: Caused by contaminated drinking water.
  17. Greenhouse effect is caused by trapping of:
    Answer: Heat
    Explanation: By gases like CO₂ and methane.
  18. Deforestation mainly affects:
    Answer: Biodiversity
    Explanation: Loss of habitat causes species decline.
  19. Which gas filters harmful UV rays?
    Answer: Ozone
    Explanation: Located in the stratosphere.
  20. The study of birds is:
    Answer: Ornithology
    Explanation: Important in ecological monitoring.

Short Paragraph – Environmental Science

Environmental Science focuses on ecosystems, pollution, climate systems, biodiversity, sustainability, and the protection of natural resources.

  1. The main reason for ozone depletion is:
    Answer: CFCs
    Explanation: Chlorofluorocarbons break down ozone molecules.
  2. The study of human impact on the environment is called:
    Answer: Environmental impact assessment
    Explanation: It evaluates effects before projects start.
  3. Which gas causes acid rain?
    Answer: Sulfur dioxide
    Explanation: SO₂ mixes with water vapor to form acids.
  4. The largest freshwater reservoir is:
    Answer: Glaciers
    Explanation: Most of Earth’s freshwater is frozen.
  5. The process of planting trees again is called:
    Answer: Reforestation
    Explanation: It restores lost forests.
  6. Which pollution is caused by excessive fertilizers?
    Answer: Water pollution
    Explanation: Runoff leads to eutrophication.
  7. The Earth’s warmest layer is the:
    Answer: Thermosphere
    Explanation: It absorbs strong solar radiation.
  8. Green buildings are designed to reduce:
    Answer: Energy consumption
    Explanation: Sustainable materials and systems save energy.
  9. Primary pollutants are emitted:
    Answer: Directly from sources
    Explanation: Examples include CO, SO₂, NO.
  10. Which organism starts most food chains?
    Answer: Producers
    Explanation: Plants create energy-rich food.
  11. The main cause of soil erosion is:
    Answer: Deforestation
    Explanation: Tree roots hold soil in place.
  12. What does “zero waste” mean?
    Answer: No waste sent to landfills
    Explanation: Focus is on reuse and recycling.
  13. The process that warms the Earth naturally is:
    Answer: Greenhouse effect
    Explanation: Prevents Earth from freezing.
  14. Organic farming avoids:
    Answer: Chemical fertilizers
    Explanation: It uses natural compost and biological control.
  15. Which is an example of e-waste?
    Answer: Old mobile phones
    Explanation: Electronics contain metals harmful to the environment.
  16. Which energy is obtained from heated groundwater?
    Answer: Geothermal
    Explanation: Heat from Earth’s interior generates electricity.
  17. The world’s largest biome is:
    Answer: Marine biome
    Explanation: Oceans cover 71% of Earth.
  18. What is “biocapacity”?
    Answer: Earth’s ability to regenerate resources
    Explanation: It measures ecological sustainability.
  19. Noise pollution mainly affects:
    Answer: Hearing ability
    Explanation: High decibels damage ear cells.
  20. Which gas is increasing due to fossil fuel burning?
    Answer: Carbon dioxide
    Explanation: CO₂ is the major greenhouse gas.

🌍 Short Paragraph – Environmental Science

Environmental Science studies ecosystems, pollution, energy, climate change, and sustainability to conserve natural resources.

  1. The main greenhouse gas is:
    Answer: Carbon dioxide
    Explanation: Traps heat in the atmosphere causing global warming.
  2. Which pollutant causes smog formation?
    Answer: Nitrogen oxides
    Explanation: React with sunlight to form photochemical smog.
  3. The process of restoring trees on deforested land is:
    Answer: Reforestation
    Explanation: Helps reduce soil erosion and increase biodiversity.
  4. Which layer protects Earth from UV radiation?
    Answer: Ozone layer
    Explanation: Absorbs harmful ultraviolet rays.
  5. Excessive use of fertilizers causes:
    Answer: Eutrophication
    Explanation: Nutrient runoff causes algae blooms in water bodies.
  6. The largest source of energy on Earth is:
    Answer: Solar energy
    Explanation: Sun provides renewable energy for ecosystems.
  7. Which gas is released by livestock contributing to global warming?
    Answer: Methane
    Explanation: Produced during digestion in ruminants.
  8. Acid rain is mainly caused by:
    Answer: Sulfur dioxide and nitrogen oxides
    Explanation: These gases react with water in the atmosphere.
  9. Which resource cannot be replenished naturally?
    Answer: Fossil fuels
    Explanation: Take millions of years to form.
  10. Water suitable for drinking is called:
    Answer: Potable water
    Explanation: Free from harmful contaminants.
  11. Noise above 85 dB can cause:
    Answer: Hearing damage
    Explanation: Long-term exposure affects auditory nerves.
  12. The study of soil is:
    Answer: Pedology
    Explanation: Examines formation, structure, and fertility.
  13. A species found only in a specific location is:
    Answer: Endemic
    Explanation: Restricted to a particular region.
  14. The layer where weather occurs is:
    Answer: Troposphere
    Explanation: Contains clouds and rain.
  15. Which natural disaster is caused by tectonic plate movement?
    Answer: Earthquake
    Explanation: Sudden release of energy along faults.
  16. The main cause of water scarcity is:
    Answer: Overuse and pollution
    Explanation: Supply decreases while demand increases.
  17. The term “biodiversity” refers to:
    Answer: Variety of life
    Explanation: Includes plants, animals, and microorganisms.
  18. Which human activity contributes most to deforestation?
    Answer: Logging and agriculture
    Explanation: Clears forests for resources and land.
  19. Which renewable energy comes from flowing water?
    Answer: Hydropower
    Explanation: Dams convert kinetic energy into electricity.

Short Paragraph:
Environmental Science studies Earth’s systems, pollution, resources, climate, and human impacts, aiming to protect the environment and promote sustainability.

  1. The largest source of atmospheric methane is:
    Answer: Agriculture
    Explanation: Mainly from rice fields and livestock.

  2. The percentage of nitrogen in air is:
    Answer: 78%
    Explanation: Nitrogen is the major atmospheric gas.

  3. The process of turning waste into energy is:
    Answer: Waste-to-energy
    Explanation: Converts waste into electricity or heat.

  4. The gas responsible for acid rainfall is:
    Answer: Sulfur dioxide
    Explanation: Reacts with water to form sulfuric acid.

  5. Layer of Earth beneath crust is:
    Answer: Mantle
    Explanation: Contains hot, semi-solid rocks.

  6. The main cause of waterborne diseases is:
    Answer: Contaminated water
    Explanation: Carries microbes like bacteria and protozoa.

  7. Increase of nutrients in water is called:
    Answer: Eutrophication
    Explanation: Causes algal blooms and oxygen depletion.

  8. The practice of protecting wildlife is:
    Answer: Conservation
    Explanation: Ensures survival of species.

  9. The natural disaster measured on Richter scale is:
    Answer: Earthquake
    Explanation: Measures seismic magnitude.

  10. The most abundant renewable resource is:
    Answer: Solar energy
    Explanation: Comes continuously from the sun.

  11. The rise in average global temperature is called:
    Answer: Global warming
    Explanation: Caused by greenhouse gases.

  12. The gas given off by decaying organic matter is:
    Answer: Methane
    Explanation: Produced by anaerobic bacteria.

  13. The loss of fertile soil is called:
    Answer: Soil erosion
    Explanation: Caused by wind, rain, and human activity.

  14. The primary greenhouse gas in agriculture is:
    Answer: Methane
    Explanation: Emitted from rice paddies and livestock.

  15. The water layer of the Earth is called:
    Answer: Hydrosphere
    Explanation: Includes rivers, lakes, oceans.

  16. Burning of fossil fuels releases:
    Answer: Carbon monoxide
    Explanation: A harmful air pollutant.

  17. The biome with very low rainfall is:
    Answer: Desert
    Explanation: Supports drought-resistant plants.

  18. The practice of growing plants without soil is:
    Answer: Hydroponics
    Explanation: Uses nutrient solutions.

  19. The process of capturing CO₂ from the air is:
    Answer: Carbon sequestration
    Explanation: Helps reduce greenhouse gases.

  20. The most common indoor pollutant is:
    Answer: Smoke
    Explanation: From cooking, heating, or tobacco.

Environmental Science One Liner MCQs boost awareness of climate change, sustainability, and resource use. They help students grasp ecology, prepare for exams, and promote environmental responsibility.

Conclusion

Environmental Science One Liner MCQs help learners strengthen awareness about climate change, sustainability, and resource management. Practicing these questions develops a clear understanding of ecological systems and environmental protection policies. Moreover, they are useful for competitive exams like CSS, PMS, and general knowledge tests. By mastering these short questions, students not only improve exam performance but also become more conscious about their role in protecting the environment.

Q1. Why study Environmental Science MCQs?
They help build awareness about ecology and sustainability.

Q2. Are these MCQs helpful for competitive exams?
Yes, they’re ideal for general knowledge and environmental awareness tests.

Q3. How to remember environmental concepts easily?
Revise daily and link topics like pollution and conservation with real-life examples.

About Us

Welcome to MyMCQs.net, your ultimate destination for quality multiple-choice questions (MCQs) and exam preparation resources. Our mission is to provide students, educators, and professionals with a comprehensive platform to enhance their knowledge and skills in various fields. At MyMCQs.net, we understand the challenges of preparing for exams and assessments. That’s why we’ve created a user-friendly platform featuring a vast collection of MCQs across subjects like science, mathematics, business, history, and more. Whether you’re studying for school exams, certifications, or competitive tests, we have the resources to help you succeed. Stay ahead, stay confident with MyMcqs.net!

Email us:  mymcqss@gmail.com

Facebook Instagram Youtube Linkedin

Quick Links

Useful Links

Copyright © 2025 mymcqs.net All rights reserved.

Scroll to Top