Biology Mcqs 09
Which organelle is known as the powerhouse of the cell? Nucleus Mitochondria RibosomeGolgi apparatusB) Mitochondria Mitochondria produce energy (ATP) through cellular respiration.
What is the basic unit of life?AtomCellTissueOrganB) CellThe cell is the smallest structural and functional unit of life.
Which vitamin is essential for blood clotting? Vitamin AVitamin CVitamin KVitamin DC) Vitamin K Vitamin K is needed for synthesizing clotting factors in the blood.
What is the largest gland in the human body?PancreasThyroidLiver Pituitary C) LiverThe liver is the largest gland and performs multiple functions like detoxification and metabolism.
What pigment gives plants their green color?Hemoglobin ChlorophyllCaroteneXanthophyllB) Chlorophyll Chlorophyll absorbs sunlight for photosynthesis and makes plants green.
Which blood cells help in clotting? Red blood cellsWhite blood cells PlateletsPlasmaC) PlateletsPlatelets (thrombocytes) are responsible for blood clotting.
The study of heredity is called:EcologyGeneticsAnatomyCytologyB) Genetics Genetics deals with inheritance and variation of traits.
The human heart has how many chambers?2345 C) 4The heart has two atria and two ventricles.
Which part of the brain controls balance?CerebrumMedullaCerebellumHypothalamus C) CerebellumThe cerebellum regulates balance and coordination.
Which organ excretes urea?LiverKidneySkin Lungs: B) KidneyKidneys filter blood and excrete urea in urine.
What is the main function of red blood cells?Fight infection Blood clottingTransport oxygenProduce antibodiesC) Transport oxygen Red blood cells carry oxygen from lungs to tissues.
Which part of the plant conducts photosynthesis?RootStem LeafFlowerC) Leaf Leaves are the main site of photosynthesis.
DNA stands for: Deoxyribose Nucleic AcidDeoxyribonucleic Acid Dioxinucleic Acid Double Nucleic Acid B) Deoxyribonucleic AcidDNA carries genetic information.
The smallest bone in the human body is:FemurTibiaStapesUlnaC) Stapes The stapes bone is in the middle ear and is the smallest.
Which blood group is known as the universal donor?ABABO: D) OBlood group O can donate to any group.