41. Which option correctly completes the fact: which cells help defend the body against infection?
✅ C. White blood cells
a: Red blood cells | b: Platelets | c: White blood cells | d: Adipocytes Read more
Biology MCQs – Page 3
42. Which option correctly completes the fact: which vitamin is essential for normal blood clotting?
✅ A. Vitamin K
a: Vitamin K | b: Vitamin D | c: Vitamin B1 | d: Vitamin C Read more
43. Which option correctly completes the fact: which organ is primarily responsible for gas exchange in humans?
✅ B. Lungs
a: Gallbladder | b: Lungs | c: Heart | d: Spleen Read more
44. Which option correctly completes the fact: which part of a plant absorbs most water from soil?
✅ D. Roots
a: Flowers | b: Fruits | c: Leaves only | d: Roots Read more
45. Which option correctly completes the fact: which pigment gives many plants their green colour?
✅ B. Chlorophyll
a: Melanin | b: Chlorophyll | c: Haemoglobin | d: Keratin Read more
46. Which option correctly completes the fact: which blood type is commonly called the universal red-cell donor in emergency contexts?
✅ A. O negative
a: O negative | b: B negative | c: A positive | d: AB positive Read more
47. Which option correctly completes the fact: which organ filters blood to produce urine?
✅ D. Kidney
a: Lung | b: Pancreas | c: Stomach | d: Kidney Read more
48. Which option correctly completes the fact: which molecule carries hereditary information in most organisms?
✅ B. DNA
a: Glucose | b: DNA | c: Cellulose | d: ATP Read more
49. Which option correctly completes the fact: which organelle is often called the powerhouse of the cell?
✅ A. Mitochondrion
a: Mitochondrion | b: Lysosome | c: Golgi apparatus | d: Ribosome Read more
50. Which option correctly completes the fact: what is the basic structural and functional unit of life?
✅ C. Cell
a: Organ | b: Organ system | c: Cell | d: Tissue Read more
51. In basic biology, which process reduces chromosome number to form gametes?
✅ A. Meiosis
a: Meiosis | b: Binary fission | c: Mitosis | d: Budding Read more
52. In basic biology, which gas is released by plants during photosynthesis?
✅ B. Oxygen
a: Ammonia | b: Oxygen | c: Methane | d: Carbon monoxide Read more
53. In basic biology, which plant tissue transports sugars?
✅ A. Phloem
a: Phloem | b: Xylem | c: Cuticle | d: Stomata Read more
54. In basic biology, which plant tissue transports water upward?
✅ B. Xylem
a: Epidermis | b: Xylem | c: Phloem | d: Cortex only Read more
55. In basic biology, which blood component helps form clots?
✅ B. Platelets
a: Alveoli | b: Platelets | c: Red blood cells | d: Neurons Read more
56. In basic biology, which part of the eye controls the amount of light entering?
✅ D. Iris
a: Cornea only | b: Optic nerve | c: Retina | d: Iris Read more
57. In basic biology, which structure controls what enters and leaves a cell?
✅ A. Cell membrane
a: Cell membrane | b: Cell wall only | c: Nucleolus | d: Chromosome Read more
58. In basic biology, what is the largest organ of the human body?
✅ C. Skin
a: Lung | b: Liver | c: Skin | d: Brain Read more
59. In basic biology, which molecule is the main immediate energy currency of cells?
✅ D. ATP
a: DNA | b: RNA | c: Starch | d: ATP Read more
60. In basic biology, which organisms make their own food using sunlight in most ecosystems?
✅ C. Producers
a: Primary consumers | b: Predators | c: Producers | d: Decomposers only Read more