481. Practice check: Which option correctly completes the fact: which part of the eye controls the amount of light entering?
✅ D. Iris
a: Optic nerve | b: Cornea only | c: Retina | d: Iris Read more
Biology MCQs – Page 25
482. Practice check: Which option correctly completes the fact: what is the largest organ of the human body?
✅ D. Skin
a: Lung | b: Brain | c: Liver | d: Skin Read more
483. Practice check: Which option correctly completes the fact: which molecule is the main immediate energy currency of cells?
✅ D. ATP
a: RNA | b: Starch | c: DNA | d: ATP Read more
484. Practice check: Which option correctly completes the fact: which structure controls what enters and leaves a cell?
✅ D. Cell membrane
a: Chromosome | b: Cell wall only | c: Nucleolus | d: Cell membrane Read more
485. Practice check: Which option correctly completes the fact: which organisms make their own food using sunlight in most ecosystems?
✅ D. Producers
a: Decomposers only | b: Predators | c: Primary consumers | d: Producers Read more
486. Practice check: Which option correctly completes the fact: what is the study of insects called?
✅ A. Entomology
a: Entomology | b: Botany | c: Mycology | d: Herpetology Read more
487. Practice check: Which option correctly completes the fact: what is the study of fungi called?
✅ D. Mycology
a: Ecology | b: Ornithology | c: Entomology | d: Mycology Read more
488. Practice check: Which option correctly completes the fact: which part of the brain helps coordinate balance and movement?
✅ C. Cerebellum
a: Medulla only | b: Hypothalamus | c: Cerebellum | d: Pituitary gland Read more
489. Practice check: Which option correctly completes the fact: which biological process produces two genetically similar daughter cells for growth?
✅ B. Mitosis
a: Fertilization | b: Mitosis | c: Meiosis | d: Transcription Read more
490. Practice check: Which option correctly completes the fact: which organ produces insulin?
✅ B. Pancreas
a: Gallbladder | b: Pancreas | c: Thyroid | d: Spleen Read more
491. Practice check: Which option correctly completes the fact: which vitamin is essential for normal blood clotting?
✅ C. Vitamin K
a: Vitamin B1 | b: Vitamin C | c: Vitamin K | d: Vitamin D Read more
492. Practice check: Which option correctly completes the fact: which cells help defend the body against infection?
✅ D. White blood cells
a: Red blood cells | b: Adipocytes | c: Platelets | d: White blood cells Read more
493. Practice check: Which option correctly completes the fact: which organ is primarily responsible for gas exchange in humans?
✅ A. Lungs
a: Lungs | b: Heart | c: Gallbladder | d: Spleen Read more
494. Practice check: Which option correctly completes the fact: which part of a plant absorbs most water from soil?
✅ D. Roots
a: Leaves only | b: Flowers | c: Fruits | d: Roots Read more
495. Practice check: Which option correctly completes the fact: which organ filters blood to produce urine?
✅ C. Kidney
a: Stomach | b: Lung | c: Kidney | d: Pancreas Read more
496. Practice check: Which option correctly completes the fact: which pigment gives many plants their green colour?
✅ A. Chlorophyll
a: Chlorophyll | b: Keratin | c: Haemoglobin | d: Melanin Read more
497. Practice check: 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: AB positive | c: B negative | d: A positive Read more
498. Practice check: Which option correctly completes the fact: which molecule carries hereditary information in most organisms?
✅ A. DNA
a: DNA | b: ATP | c: Glucose | d: Cellulose Read more
499. Practice check: Which option correctly completes the fact: which organelle is often called the powerhouse of the cell?
✅ C. Mitochondrion
a: Golgi apparatus | b: Lysosome | c: Mitochondrion | d: Ribosome Read more
500. Practice check: In basic biology, which gas is released by plants during photosynthesis?
✅ C. Oxygen
a: Carbon monoxide | b: Methane | c: Oxygen | d: Ammonia Read more