Biology MCQs (271–300) with Answers and Reasons are prepared for NEET, CUET, and Board exam preparation.
This set focuses on Human Physiology, Genetics, Plant Physiology, Cell Biology, and Ecology.
Regular practice of these MCQs helps improve conceptual clarity and exam confidence.
271. Which part of the brain controls voluntary actions?
Correct Answer: A
Reason: Cerebrum controls voluntary actions and thinking.
272. Which hormone is known as the stress hormone?
Correct Answer: C
Reason: Adrenaline prepares the body to face stress.
273. Which blood vessel carries blood away from the heart?
Correct Answer: B
Reason: Arteries carry blood away from the heart.
274. Which organelle is responsible for photosynthesis?
Correct Answer: D
Reason: Chloroplast contains chlorophyll for photosynthesis.
275. Which vitamin helps in calcium absorption?
Correct Answer: B
Reason: Vitamin D promotes calcium absorption in bones.
276. Which part of the nephron filters blood?
Correct Answer: A
Reason: Glomerulus filters blood plasma.
277. Which plant hormone causes leaf fall?
Correct Answer: D
Reason: Abscisic acid promotes leaf fall and dormancy.
278. Which microorganism is used in bread making?
Correct Answer: B
Reason: Yeast produces carbon dioxide during fermentation.
279. Which part of the eye focuses light on the retina?
Correct Answer: C
Reason: Lens focuses light onto the retina.
280. Which gas is absorbed during photosynthesis?
Correct Answer: B
Reason: Carbon dioxide is required to form glucose.
281. Which blood group is universal recipient?
Correct Answer: C
Reason: Blood group AB can receive blood from all groups.
282. Which enzyme digests fats in the small intestine?
Correct Answer: D
Reason: Lipase breaks fats into fatty acids and glycerol.
283. Which part of the plant absorbs water?
Correct Answer: A
Reason: Root hairs increase surface area for absorption.
284. Which disease is caused by virus?
Correct Answer: B
Reason: Dengue is caused by a virus transmitted by mosquitoes.
285. Which cell organelle is known as the powerhouse of the cell?
Correct Answer: C
Reason: Mitochondria produce ATP energy.
286. Which part of the flower contains ovules?
Correct Answer: D
Reason: Ovary contains ovules.
287. Which gas is released during respiration?
Correct Answer: B
Reason: Carbon dioxide is produced during respiration.
288. Which part of the ear maintains balance?
Correct Answer: C
Reason: Semicircular canals help maintain balance.
289. Which nutrient is the main source of energy?
Correct Answer: A
Reason: Carbohydrates provide quick energy.
290. Which structure connects muscles to bones?
Correct Answer: B
Reason: Tendons attach muscles to bones.
291. Which microorganism causes cholera?
Correct Answer: A
Reason: Cholera is caused by bacteria.
292. Which blood vessel carries oxygenated blood from lungs to heart?
Correct Answer: D
Reason: Pulmonary vein carries oxygenated blood.
293. Which plant tissue transports water?
Correct Answer: A
Reason: Xylem conducts water and minerals.
294. Which vitamin deficiency causes scurvy?
Correct Answer: C
Reason: Vitamin C deficiency causes scurvy.
295. Which organ stores urine?
Correct Answer: B
Reason: Urinary bladder temporarily stores urine.
296. Which part of the brain regulates body temperature?
Correct Answer: D
Reason: Hypothalamus regulates body temperature.
297. Which organism fixes atmospheric nitrogen?
Correct Answer: C
Reason: Rhizobium fixes nitrogen in leguminous plants.
298. Which organelle contains digestive enzymes?
Correct Answer: D
Reason: Lysosomes contain digestive enzymes.
299. Which gas is essential for respiration?
Correct Answer: A
Reason: Oxygen is required for cellular respiration.
300. Which part of the flower receives pollen?
Correct Answer: C
Reason: Stigma receives pollen grains during pollination.
Biology MCQs (271–300) FAQs
1. Are these MCQs suitable for NEET?
Yes, all questions are NCERT-based and NEET focused.
2. Do all questions include reasons?
Yes, each MCQ includes a clear and short reason.
3. Which topics are covered in this part?
Human physiology, plant physiology, cell biology, and ecology.
4. Can board students use these MCQs?
Yes, these MCQs are useful for board examinations as well.
5. Will further parts follow the same format?
Yes, all upcoming Biology MCQ parts will follow the same pattern.
Yes, all questions are NCERT-based and NEET focused.
2. Do all questions include reasons?
Yes, each MCQ includes a clear and short reason.
3. Which topics are covered in this part?
Human physiology, plant physiology, cell biology, and ecology.
4. Can board students use these MCQs?
Yes, these MCQs are useful for board examinations as well.
5. Will further parts follow the same format?
Yes, all upcoming Biology MCQ parts will follow the same pattern.
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