BIOLOGY ONE LINER MCQS PDF Download Solved with Answers

BIOLOGY ONE LINER MCQS

Biology One-Liner MCQs are carefully designed to help students and job seekers revise essential biological concepts quickly. Additionally, these short and focused questions cover important topics such as cells, genetics, ecology, and human physiology. Moreover, each Biology One liner MCQs is concise, allowing you to prepare efficiently in less time. Besides, these Biology one-liners are ideal for competitive exams like NTS, FPSC, PPSC, and CSS. Consequently, practicing Biology One liner MCQs regularly enhances your conceptual understanding and factual recall. Meanwhile, by reviewing answers consistently, learners can strengthen their preparation for any biology-related test. Therefore, keep revising and testing yourself with our updated Biology One-Liner MCQs with answers to achieve excellent results in upcoming exams. Hence, this collection supports fast learning and continuous improvement. Also, it ensures better retention during quick revisions. Finally, keep practicing daily to master key Biology concepts effectively.

What is the basic unit of life?
Answer: Cell
Who is known as the father of modern biology?
Answer: Aristotle
Which cell organelle is called the powerhouse of the cell?
Answer: Mitochondria
Which pigment is responsible for photosynthesis?
Answer: Chlorophyll
What is the structural and functional unit of the kidney?
Answer: Nephron
Which organ is known as the detoxifying organ?
Answer: Liver
What is the largest gland in the human body?
Answer: Liver
Which vitamin is synthesized in skin by sunlight?
Answer: Vitamin D
Which blood group is the universal donor?
Answer: O Negative
Which blood group is the universal recipient?
Answer: AB Positive
What is the normal pH of human blood?
Answer: 7.35–7.45
Which blood cells fight infection?
Answer: White Blood Cells (WBCs)
What is the normal human body temperature in Celsius?
Answer: 37°C
Which is the largest organ in the human body?
Answer: Skin
Which mineral is required for hemoglobin formation?
Answer: Iron
What tissue connects bone to bone?
Answer: Ligament
What tissue connects bone to muscle?
Answer: Tendon
Which is the smallest bone in the human body?
Answer: Stapes
Which is the longest bone in the human body?
Answer: Femur
Which organ filters waste from blood?
Answer: Kidney
Which organ regulates blood sugar?
Answer: Pancreas
Which hormone regulates blood sugar?
Answer: Insulin
Which hormone is known as the fight-or-flight hormone?
Answer: Adrenaline
Which organ produces bile?
Answer: Liver
Which organ stores bile?
Answer: Gallbladder
Which part of the brain controls balance?
Answer: Cerebellum
Which part of the brain controls breathing and heartbeat?
Answer: Medulla Oblongata
Which is the control center of the cell?
Answer: Nucleus
Which cell organelle is responsible for protein synthesis?
Answer: Ribosome
What is the chemical name of Vitamin C?
Answer: Ascorbic Acid
Which vitamin prevents night blindness?
Answer: Vitamin A
Which vitamin is necessary for blood clotting?
Answer: Vitamin K
Which vitamin deficiency causes rickets?
Answer: Vitamin D
Which vitamin deficiency causes scurvy?
Answer: Vitamin C
Which vitamin deficiency causes beriberi?
Answer: Vitamin B1
Which vitamin deficiency causes pellagra?
Answer: Vitamin B3
Which is the largest artery in the human body?
Answer: Aorta
Which is the largest vein in the human body?
Answer: Vena Cava
Which blood vessels carry blood away from the heart?
Answer: Arteries
Which blood vessels carry blood to the heart?
Answer: Veins
What is the functional unit of the nervous system?
Answer: Neuron
Which part of the brain controls intelligence?
Answer: Cerebrum
What is the fluid that cushions the brain and spinal cord?
Answer: Cerebrospinal Fluid
What is the scientific name of humans?
Answer: Homo sapiens
Which is the hardest substance in the human body?
Answer: Enamel
Which protein is found in hair and nails?
Answer: Keratin
Which pigment gives skin its color?
Answer: Melanin
Which element is essential for thyroid hormone production?
Answer: Iodine
Which disease is caused by iodine deficiency?
Answer: Goiter
Which disease is caused by lack of insulin?
Answer: Diabetes Mellitus
Which organ removes old red blood cells?
Answer: Spleen
Which organ is called the “graveyard of RBCs”?
Answer: Spleen
Which organ produces red blood cells in embryos?
Answer: Liver
Which organ produces red blood cells in adults?
Answer: Bone marrow
What is the lifespan of a red blood cell?
Answer: 120 days
What is the lifespan of a white blood cell?
Answer: 2–3 days
What is the lifespan of platelets?
Answer: 7–10 days
What is the average human blood volume?
Answer: 5–6 liters
What is the blood clotting protein?
Answer: Fibrinogen
Which enzyme breaks down starch?
Answer: Amylase
Which enzyme breaks down protein?
Answer: Pepsin
Which enzyme breaks down fat?
Answer: Lipase
Which enzyme is present in saliva?
Answer: Ptyalin
Which enzyme is absent in gastric juice?
Answer: Lipase
Which plant tissue transports water?
Answer: Xylem
Which plant tissue transports food?
Answer: Phloem
What is the green pigment in plants?
Answer: Chlorophyll
What is the process of loss of water from leaves called?
Answer: Transpiration
What is the process of food production in plants called?
Answer: Photosynthesis
Which gas is released during photosynthesis?
Answer: Oxygen
Which gas is used in photosynthesis?
Answer: Carbon dioxide
Which light is most effective for photosynthesis?
Answer: Red and Blue
Which carbohydrate is formed in photosynthesis?
Answer: Glucose
Which carbohydrate is stored in plants?
Answer: Starch
Which carbohydrate is stored in animals?
Answer: Glycogen
Which organelle is responsible for photosynthesis?
Answer: Chloroplast
Which kingdom includes bacteria?
Answer: Monera
Which kingdom includes fungi?
Answer: Fungi
Which kingdom includes amoeba?
Answer: Protista
Which kingdom includes flowering plants?
Answer: Plantae
Which kingdom includes humans?
Answer: Animalia
Which is the largest phylum in the animal kingdom?
Answer: Arthropoda
Which is the largest vertebrate?
Answer: Blue Whale
Which is the smallest bird?
Answer: Hummingbird
Which is the largest bird?
Answer: Ostrich
Which is the fastest animal on land?
Answer: Cheetah
Which is the fastest bird?
Answer: Peregrine Falcon
Which is the largest land animal?
Answer: Elephant
Which is the largest reptile?
Answer: Saltwater Crocodile
Which is the largest amphibian?
Answer: Chinese Giant Salamander
Which is the largest fish?
Answer: Whale Shark
Which is the largest mammal?
Answer: Blue Whale
Which blood cell has no nucleus?
Answer: Red Blood Cell
Which is the liquid part of blood?
Answer: Plasma
Which protein carries oxygen in blood?
Answer: Hemoglobin
What is the normal heartbeat rate per minute?
Answer: 72
What is the process of inhaling oxygen and exhaling carbon dioxide?
Answer: Respiration
Which organ is responsible for breathing?
Answer: Lungs
Which structure prevents food from entering windpipe?
Answer: Epiglottis
Which muscle controls breathing?
Answer: Diaphragm
Which part of the plant absorbs water from soil?
Answer: Root hairs
Which part of the plant transports food?
Answer: Phloem
Which gas do plants release at night?
Answer: Carbon dioxide
Which part of the plant is known as the food factory?
Answer: Leaf
Which process converts glucose into energy in cells?
Answer: Cellular respiration
Which is the smallest unit of heredity?
Answer: Gene
Which scientist discovered the structure of DNA?
Answer: Watson and Crick
What is the shape of DNA?
Answer: Double helix
Which sugar is present in DNA?
Answer: Deoxyribose
Which sugar is present in RNA?
Answer: Ribose
Which sugar is present in RNA?
Answer: Ribose
Which base is present in DNA but not in RNA?
Answer: Thymine
Which base is present in RNA but not in DNA?
Answer: Uracil
What is the process of copying DNA into RNA?
Answer: Transcription
What is the process of making proteins from RNA?
Answer: Translation
What is the total number of chromosomes in humans?
Answer: 46
How many pairs of chromosomes are in humans?
Answer: 23
Which chromosomes determine sex in humans?
Answer: X and Y chromosomes
Which sex chromosome combination makes a female?
Answer: XX
Which sex chromosome combination makes a male?
Answer: XY
Which organ controls body temperature?
Answer: Hypothalamus
Which vitamin is produced by intestinal bacteria?
Answer: Vitamin K
Which organ helps in digestion of fat?
Answer: Liver
Which type of blood cells help in clotting?
Answer: Platelets
Which blood group has no antigens?
Answer: O
Which blood group has both antigens A and B?
Answer: AB
Which scientist proposed the theory of evolution by natural selection?
Answer: Charles Darwin
Which scientist is known as the father of genetics?
Answer: Gregor Mendel
What is the study of heredity called?
Answer: Genetics
What is the study of fungi called?
Answer: Mycology
What is the study of viruses called?
Answer: Virology
What is the study of birds called?
Answer: Ornithology
What is the study of fish called?
Answer: Ichthyology
What is the study of insects called?
Answer: Entomology
What is the study of fossils called?
Answer: Paleontology
What is the study of environment called?
Answer: Ecology
What is the study of tissues called?
Answer: Histology
What is the study of cells called?
Answer: Cytology
What is the study of blood called?
Answer: Hematology
What is the study of bones called?
Answer: Osteology
What is the study of kidneys called?
Answer: Nephrology
What is the study of heart called?
Answer: Cardiology
What is the study of brain called?
Answer: Neurology
What is the study of skin called?
Answer: Dermatology
What is the study of liver called?
Answer: Hepatology
What is the study of stomach and intestines called?
Answer: Gastroenterology
Which vitamin is water-soluble?
Answer: Vitamin C
Which vitamin is fat-soluble?
Answer: Vitamin A
Which vitamin helps in calcium absorption?
Answer: Vitamin D
Which mineral deficiency causes anemia?
Answer: Iron
Which mineral deficiency causes osteoporosis?
Answer: Calcium
Which mineral is important for thyroid hormones?
Answer: Iodine
Which mineral is important for insulin function?
Answer: Zinc
Which mineral is essential for teeth and bones?
Answer: Calcium
Which mineral is a component of hemoglobin?
Answer: Iron
Which plant stores food in its roots?
Answer: Carrot
Which plant stores food in its stem?
Answer: Potato
Which plant stores food in its leaves?
Answer: Cabbage
Which plant stores food in its seeds?
Answer: Wheat
Which plant stores food in its fruit?
Answer: Mango
What is the main photosynthetic tissue in plants?
Answer: Mesophyll
Which organelle stores starch in plants?
Answer: Amyloplast
Which part of the flower produces pollen?
Answer: Anther
Which part of the flower receives pollen?
Answer: Stigma
What is the female reproductive organ in flowers?
Answer: Carpel
What is the male reproductive organ in flowers?
Answer: Stamen
Which part of the seed develops into a root?
Answer: Radicle
Which part of the seed develops into a shoot?
Answer: Plumule
Which part of the plant is modified for climbing?
Answer: Tendril
Which part of the plant is modified for food storage?
Answer: Tuber
Which part of the eye controls light entry?
Answer: Pupil
Which part of the eye gives shape to the eyeball?
Answer: Sclera
Which part of the eye focuses light?
Answer: Lens
Which part of the eye is light-sensitive?
Answer: Retina
Which pigment in the eye helps night vision?
Answer: Rhodopsin
Which part of the ear helps in balance?
Answer: Semicircular canals
Which part of the ear helps in hearing?
Answer: Cochlea
Which is the smallest muscle in the human body?
Answer: Stapedius
Which is the largest muscle in the human body?
Answer: Gluteus maximus
Which is the strongest muscle in the human body?
Answer: Masseter
Which is the longest muscle in the human body?
Answer: Sartorius
Which protein helps muscles contract?
Answer: Actin and Myosin
Which gas is carried by hemoglobin?
Answer: Oxygen
Which organ removes carbon dioxide from blood?
Answer: Lungs
Which organ removes nitrogenous wastes?
Answer: Kidney
Which process removes nitrogenous waste from body?
Answer: Excretion
Which organ regulates water balance?
Answer: Kidney
Which organ controls reflex actions?
Answer: Spinal cord
Which organ controls emotions?
Answer: Limbic system
Which part of the brain controls hunger and thirst?
Answer: Hypothalamus
Which part of the brain stores memory?
Answer: Hippocampus
Which part of the brain coordinates movement?
Answer: Cerebellum
Which blood cell type is phagocytic?
Answer: Neutrophils
Which cells produce antibodies?
Answer: B-lymphocytes
Which cells destroy virus-infected cells?
Answer: T-lymphocytes
Which blood cell count rises during allergy?
Answer: Eosinophils
Which blood cell count rises during infection?
Answer: White Blood Cells
Which blood cell carries carbon dioxide?
Answer: Red Blood Cells
Which protein in RBC carries oxygen?
Answer: Hemoglobin
Which ion is essential for blood clotting?
Answer: Calcium
Which is the largest internal organ?
Answer: Liver
Which organ stores vitamin A?
Answer: Liver
Which organ produces urea?
Answer: Liver
Which organ stores glycogen?
Answer: Liver
Which organ is known as “blood bank of the body”?
Answer: Spleen
Which organ produces digestive enzymes?
Answer: Pancreas
Which organ produces insulin?
Answer: Pancreas
Which hormone regulates metabolism?
Answer: Thyroxine
Which hormone controls sleep?
Answer: Melatonin
Which hormone regulates female cycle?
Answer: Estrogen
Which hormone regulates male sex organs?
Answer: Testosterone
Which hormone regulates childbirth contractions?
Answer: Oxytocin
Which hormone regulates milk production?
Answer: Prolactin
Which hormone regulates calcium in blood?
Answer: Parathyroid hormone
Which hormone regulates growth?
Answer: Growth hormone
Which hormone regulates water balance?
Answer: ADH (Antidiuretic hormone)
Which hormone is secreted by adrenal glands?
Answer: Adrenaline
Which hormone regulates stress response?
Answer: Cortisol
Which hormone is secreted by pancreas?
Answer: Insulin
Which is the master gland in the body?
Answer: Pituitary gland
Which type of joint is present in the skull?
Answer: Immovable joint
Which type of joint is present in shoulder?
Answer: Ball and socket joint
Which type of joint is present in elbow?
Answer: Hinge joint
Which type of joint is present in neck?
Answer: Pivot joint
Which type of joint is present in wrist?
Answer: Gliding joint
Which type of skeleton do humans have?
Answer: Endoskeleton
Which skeleton is present in insects?
Answer: Exoskeleton
Which skeleton is present in sharks?
Answer: Cartilaginous skeleton
Which is the largest bone in arm?
Answer: Humerus
Which is the largest bone in leg?
Answer: Femur
Which is the only movable bone in skull?
Answer: Mandible
Which is the hardest bone in human body?
Answer: Femur
Which bone protects brain?
Answer: Skull
Which bone protects heart and lungs?
Answer: Rib cage
Which bone protects spinal cord?
Answer: Vertebrae
Which bone is known as collar bone?
Answer: Clavicle
Which bone is known as shoulder blade?
Answer: Scapula
Which bone is known as kneecap?
Answer: Patella
Which bone is known as breastbone?
Answer: Sternum
Which bone is known as tailbone?
Answer: Coccyx
Which process converts milk to curd?
Answer: Fermentation
Which microorganism is used in bread making?
Answer: Yeast
Which microorganism is used in alcohol production?
Answer: Yeast
Which microorganism causes malaria?
Answer: Plasmodium
Which microorganism causes tuberculosis?
Answer: Mycobacterium tuberculosis
Which microorganism causes AIDS?
Answer: HIV
Which microorganism causes influenza?
Answer: Influenza virus
Which microorganism causes polio?
Answer: Poliovirus
Which microorganism causes cholera?
Answer: Vibrio cholerae
Which microorganism causes typhoid?
Answer: Salmonella typhi
Which microorganism causes pneumonia?
Answer: Streptococcus pneumoniae
Which microorganism causes plague?
Answer: Yersinia pestis
Which microorganism causes rabies?
Answer: Rabies virus
Which microorganism causes tetanus?
Answer: Clostridium tetani
Which microorganism causes measles?
Answer: Measles virus
Which microorganism causes mumps?
Answer: Mumps virus
Which microorganism causes hepatitis B?
Answer: Hepatitis B virus
Which microorganism causes leprosy?
Answer: Mycobacterium leprae
Which microorganism causes syphilis?
Answer: Treponema pallidum
Which microorganism causes diphtheria?
Answer: Corynebacterium diphtheriae
Which microorganism causes anthrax?
Answer: Bacillus anthracis
Which microorganism causes whooping cough?
Answer: Bordetella pertussis
Which microorganism causes dengue fever?
Answer: Dengue virus
Which microorganism causes sleeping sickness?
Answer: Trypanosoma
Which microorganism causes amoebiasis?
Answer: Entamoeba histolytica
Which microorganism causes ringworm?
Answer: Fungi
Which microorganism causes athlete’s foot?
Answer: Fungi
Which microorganism causes chickenpox?
Answer: Varicella-zoster virus
Which microorganism causes smallpox?
Answer: Variola virus
Which microorganism causes yellow fever?
Answer: Yellow fever virus
Which microorganism causes filariasis?
Answer: Wuchereria bancrofti
Which microorganism causes scarlet fever?
Answer: Streptococcus pyogenes
Which microorganism causes cholera?
Answer: Vibrio cholerae
Which microorganism causes food poisoning?
Answer: Salmonella
Which microorganism causes plague?
Answer: Yersinia pestis
Which microorganism causes meningitis?
Answer: Neisseria meningitidis
Which microorganism causes common cold?
Answer: Rhinovirus
Which microorganism causes Ebola?
Answer: Ebola virus
Which microorganism causes Zika virus disease?
Answer: Zika virus
Which microorganism causes bird flu?
Answer: H5N1 virus
Which microorganism causes swine flu?
Answer: H1N1 virus
Which microorganism causes COVID-19?
Answer: SARS-CoV-2
Which microorganism causes cholera pandemic?
Answer: Vibrio cholerae
Which microorganism is used in insulin production?
Answer: E. coli
Which microorganism is used in antibiotics production?
Answer: Penicillium
Which microorganism produces penicillin?
Answer: Penicillium notatum
Which microorganism produces streptomycin?
Answer: Streptomyces griseus
Which microorganism produces tetracycline?
Answer: Streptomyces
Which microorganism produces erythromycin?
Answer: Saccharopolyspora erythraea
Which microorganism produces rifamycin?
Answer: Amycolatopsis rifamycinica
Which microorganism fixes nitrogen in soil?
Answer: Rhizobium
Which microorganism is used in cheese production?
Answer: Lactobacillus
Which microorganism produces yogurt?
Answer: Lactobacillus bulgaricus
Which microorganism produces vinegar?
Answer: Acetobacter
Which microorganism produces citric acid?
Answer: Aspergillus niger
Which microorganism is used in biogas production?
Answer: Methanogens
Which microorganism produces antibiotics naturally?
Answer: Actinomycetes
Which microorganism causes kala-azar?
Answer: Leishmania donovani
Which microorganism causes cholera in humans?
Answer: Vibrio cholerae
Which microorganism causes trachoma?
Answer: Chlamydia trachomatis

What are Biology One-Liner MCQs? Frequently Asked Questions

1. What are Biology One-Liner MCQs?

Biology One-Liner MCQs are brief and direct questions that help students review key biology topics quickly and efficiently. Moreover, they are perfect for last-minute preparation and quick revision before exams. In addition, these MCQs summarize complex topics in simple, easy-to-understand statements, making learning enjoyable and effective.

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See also: GK One-Liner MCQs

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