341. Practice check: In basic biology, which vitamin is essential for normal blood clotting?
✅ B. Vitamin K
a: Vitamin D | b: Vitamin K | c: Vitamin C | d: Vitamin B1 Read more
Biology MCQs – Page 18
342. Practice check: In basic biology, which cells help defend the body against infection?
✅ A. White blood cells
a: White blood cells | b: Red blood cells | c: Adipocytes | d: Platelets Read more
343. Practice check: In basic biology, which organ is primarily responsible for gas exchange in humans?
✅ C. Lungs
a: Heart | b: Spleen | c: Lungs | d: Gallbladder Read more
344. Practice check: In basic biology, which part of a plant absorbs most water from soil?
✅ B. Roots
a: Leaves only | b: Roots | c: Flowers | d: Fruits Read more
345. Practice check: In basic biology, which pigment gives many plants their green colour?
✅ A. Chlorophyll
a: Chlorophyll | b: Haemoglobin | c: Keratin | d: Melanin Read more
346. Practice check: In basic biology, which blood type is commonly called the universal red-cell donor in emergency contexts?
✅ A. O negative
a: O negative | b: B negative | c: AB positive | d: A positive Read more
347. Practice check: In basic biology, which organ filters blood to produce urine?
✅ C. Kidney
a: Lung | b: Stomach | c: Kidney | d: Pancreas Read more
348. Practice check: In basic biology, which molecule carries hereditary information in most organisms?
✅ A. DNA
a: DNA | b: ATP | c: Glucose | d: Cellulose Read more
349. Practice check: In basic biology, what is the basic structural and functional unit of life?
✅ C. Cell
a: Organ | b: Tissue | c: Cell | d: Organ system Read more
350. Practice check: In basic biology, which organelle is often called the powerhouse of the cell?
✅ C. Mitochondrion
a: Lysosome | b: Ribosome | c: Mitochondrion | d: Golgi apparatus Read more
351. Choose the correct biology answer: which gas is released by plants during photosynthesis?
✅ A. Oxygen
a: Oxygen | b: Carbon monoxide | c: Methane | d: Ammonia Read more
352. Choose the correct biology answer: which process reduces chromosome number to form gametes?
✅ C. Meiosis
a: Mitosis | b: Budding | c: Meiosis | d: Binary fission Read more
353. Choose the correct biology answer: which plant tissue transports sugars?
✅ C. Phloem
a: Cuticle | b: Xylem | c: Phloem | d: Stomata Read more
354. Choose the correct biology answer: which blood component helps form clots?
✅ C. Platelets
a: Red blood cells | b: Alveoli | c: Platelets | d: Neurons Read more
355. Choose the correct biology answer: which plant tissue transports water upward?
✅ A. Xylem
a: Xylem | b: Epidermis | c: Cortex only | d: Phloem Read more
356. Choose the correct biology answer: which part of the eye controls the amount of light entering?
✅ A. Iris
a: Iris | b: Cornea only | c: Retina | d: Optic nerve Read more
357. Choose the correct biology answer: what is the largest organ of the human body?
✅ C. Skin
a: Liver | b: Brain | c: Skin | d: Lung Read more
358. Choose the correct biology answer: which structure controls what enters and leaves a cell?
✅ A. Cell membrane
a: Cell membrane | b: Chromosome | c: Cell wall only | d: Nucleolus Read more
359. Choose the correct biology answer: which molecule is the main immediate energy currency of cells?
✅ B. ATP
a: Starch | b: ATP | c: DNA | d: RNA Read more
360. Choose the correct biology answer: which organisms make their own food using sunlight in most ecosystems?
✅ C. Producers
a: Decomposers only | b: Predators | c: Producers | d: Primary consumers Read more