381. 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
Biology MCQs – Page 20
382. 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
383. 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
384. 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
385. 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
386. 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
387. 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
388. 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
389. Which option correctly completes the fact: which organ produces insulin?
✅ A. Pancreas
a: Pancreas | b: Gallbladder | c: Spleen | d: Thyroid Read more
390. 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
391. 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
392. 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
393. 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
394. 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
395. 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
396. 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
397. 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
398. 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
399. 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
400. 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