21. Choose the correct biology answer: which organ filters blood to produce urine?
✅ A. Kidney
a: Kidney | b: Lung | c: Pancreas | d: Stomach Read more
Biology MCQs – Page 2
22. Choose the correct biology answer: which blood type is commonly called the universal red-cell donor in emergency contexts?
✅ B. O negative
a: B negative | b: O negative | c: AB positive | d: A positive Read more
23. Choose the correct biology answer: which molecule carries hereditary information in most organisms?
✅ A. DNA
a: DNA | b: Glucose | c: ATP | d: Cellulose Read more
24. Choose the correct biology answer: which organelle is often called the powerhouse of the cell?
✅ B. Mitochondrion
a: Golgi apparatus | b: Mitochondrion | c: Ribosome | d: Lysosome Read more
25. Choose the correct biology answer: what is the basic structural and functional unit of life?
✅ B. Cell
a: Organ system | b: Cell | c: Tissue | d: Organ Read more
26. Which option correctly completes the fact: which gas is released by plants during photosynthesis?
✅ C. Oxygen
a: Carbon monoxide | b: Methane | c: Oxygen | d: Ammonia Read more
27. Which option correctly completes the fact: which process reduces chromosome number to form gametes?
✅ C. Meiosis
a: Mitosis | b: Budding | c: Meiosis | d: Binary fission Read more
28. Which option correctly completes the fact: which plant tissue transports sugars?
✅ B. Phloem
a: Cuticle | b: Phloem | c: Stomata | d: Xylem Read more
29. Which option correctly completes the fact: which plant tissue transports water upward?
✅ A. Xylem
a: Xylem | b: Epidermis | c: Phloem | d: Cortex only Read more
30. Which option correctly completes the fact: which part of the eye controls the amount of light entering?
✅ C. Iris
a: Retina | b: Optic nerve | c: Iris | d: Cornea only Read more
31. Which option correctly completes the fact: which blood component helps form clots?
✅ A. Platelets
a: Platelets | b: Neurons | c: Red blood cells | d: Alveoli Read more
32. Which option correctly completes the fact: what is the largest organ of the human body?
✅ A. Skin
a: Skin | b: Liver | c: Brain | d: Lung Read more
33. Which option correctly completes the fact: which structure controls what enters and leaves a cell?
✅ D. Cell membrane
a: Nucleolus | b: Cell wall only | c: Chromosome | d: Cell membrane Read more
34. Which option correctly completes the fact: which molecule is the main immediate energy currency of cells?
✅ C. ATP
a: DNA | b: RNA | c: ATP | d: Starch Read more
35. Which option correctly completes the fact: which organisms make their own food using sunlight in most ecosystems?
✅ C. Producers
a: Decomposers only | b: Primary consumers | c: Producers | d: Predators Read more
36. Which option correctly completes the fact: what is the study of insects called?
✅ B. Entomology
a: Botany | b: Entomology | c: Herpetology | d: Mycology Read more
37. Which option correctly completes the fact: which part of the brain helps coordinate balance and movement?
✅ B. Cerebellum
a: Hypothalamus | b: Cerebellum | c: Pituitary gland | d: Medulla only Read more
38. Which option correctly completes the fact: what is the study of fungi called?
✅ D. Mycology
a: Ornithology | b: Entomology | c: Ecology | d: Mycology Read more
39. Which option correctly completes the fact: which organ produces insulin?
✅ A. Pancreas
a: Pancreas | b: Gallbladder | c: Spleen | d: Thyroid Read more
40. Which option correctly completes the fact: which biological process produces two genetically similar daughter cells for growth?
✅ D. Mitosis
a: Fertilization | b: Meiosis | c: Transcription | d: Mitosis Read more