621. Which organ filters blood to produce urine?
✅ A. Kidney
a: Kidney | b: Pancreas | c: Lung | d: Stomach Read more
Biology MCQs – Page 32
622. Which blood type is commonly called the universal red-cell donor in emergency contexts?
✅ B. O negative
a: B negative | b: O negative | c: A positive | d: AB positive Read more
623. Which molecule carries hereditary information in most organisms?
✅ D. DNA
a: Cellulose | b: ATP | c: Glucose | d: DNA Read more
624. Which organelle is often called the powerhouse of the cell?
✅ C. Mitochondrion
a: Lysosome | b: Golgi apparatus | c: Mitochondrion | d: Ribosome Read more
625. What is the basic structural and functional unit of life?
✅ A. Cell
a: Cell | b: Organ | c: Organ system | d: Tissue Read more
626. Practice check: Choose the correct biology answer: which process reduces chromosome number to form gametes?
✅ B. Meiosis
a: Budding | b: Meiosis | c: Binary fission | d: Mitosis Read more
627. Practice check: Choose the correct biology answer: which gas is released by plants during photosynthesis?
✅ D. Oxygen
a: Methane | b: Ammonia | c: Carbon monoxide | d: Oxygen Read more
628. Practice check: Choose the correct biology answer: which plant tissue transports sugars?
✅ D. Phloem
a: Cuticle | b: Stomata | c: Xylem | d: Phloem Read more
629. Practice check: Choose the correct biology answer: which plant tissue transports water upward?
✅ C. Xylem
a: Cortex only | b: Phloem | c: Xylem | d: Epidermis Read more
630. Practice check: Choose the correct biology answer: which blood component helps form clots?
✅ B. Platelets
a: Red blood cells | b: Platelets | c: Alveoli | d: Neurons Read more
631. Practice check: Choose the correct biology answer: what is the largest organ of the human body?
✅ B. Skin
a: Brain | b: Skin | c: Liver | d: Lung Read more
632. Practice check: Choose the correct biology answer: which part of the eye controls the amount of light entering?
✅ D. Iris
a: Optic nerve | b: Retina | c: Cornea only | d: Iris Read more
633. Practice check: Choose the correct biology answer: which structure controls what enters and leaves a cell?
✅ B. Cell membrane
a: Cell wall only | b: Cell membrane | c: Chromosome | d: Nucleolus Read more
634. Practice check: Choose the correct biology answer: which molecule is the main immediate energy currency of cells?
✅ B. ATP
a: RNA | b: ATP | c: DNA | d: Starch Read more
635. Practice check: Choose the correct biology answer: which organisms make their own food using sunlight in most ecosystems?
✅ B. Producers
a: Primary consumers | b: Producers | c: Predators | d: Decomposers only Read more
636. Practice check: Choose the correct biology answer: what is the study of fungi called?
✅ A. Mycology
a: Mycology | b: Ecology | c: Entomology | d: Ornithology Read more
637. Practice check: Choose the correct biology answer: what is the study of insects called?
✅ C. Entomology
a: Mycology | b: Herpetology | c: Entomology | d: Botany Read more
638. Practice check: Choose the correct biology answer: which part of the brain helps coordinate balance and movement?
✅ A. Cerebellum
a: Cerebellum | b: Pituitary gland | c: Hypothalamus | d: Medulla only Read more
639. Practice check: Choose the correct biology answer: which organ produces insulin?
✅ A. Pancreas
a: Pancreas | b: Thyroid | c: Gallbladder | d: Spleen Read more
640. Practice check: Choose the correct biology answer: which vitamin is essential for normal blood clotting?
✅ C. Vitamin K
a: Vitamin B1 | b: Vitamin D | c: Vitamin K | d: Vitamin C Read more