Biology MCQs (241–270) with Answers and Reasons are prepared for NEET, CUET, and Board examinations.
This set covers important concepts from Human Physiology, Genetics, Cell Biology, Ecology, and Microbiology.
Practicing these MCQs helps strengthen NCERT concepts and improve exam performance.
241. Which blood cells are responsible for immunity?
Correct Answer: C
Reason: White blood cells protect the body against infections.
242. Which part of the brain controls thinking and intelligence?
Correct Answer: A
Reason: Cerebrum controls thinking, memory, and intelligence.
243. Which enzyme converts starch into maltose?
Correct Answer: B
Reason: Amylase breaks starch into maltose.
244. Which vitamin is essential for blood clotting?
Correct Answer: D
Reason: Vitamin K is required for synthesis of clotting factors.
245. Which gas is released during photosynthesis?
Correct Answer: C
Reason: Oxygen is released as a by-product of photosynthesis.
246. Which structure carries genetic information?
Correct Answer: D
Reason: DNA stores hereditary information.
247. Which plant hormone promotes cell elongation?
Correct Answer: A
Reason: Auxin stimulates elongation of plant cells.
248. Which disease is caused by bacteria?
Correct Answer: B
Reason: Tuberculosis is caused by bacteria.
249. Which organ stores bile?
Correct Answer: C
Reason: Gall bladder stores bile produced by the liver.
250. Which blood group is known as universal donor?
Correct Answer: D
Reason: Blood group O can be donated to all groups.
251. Which organ produces insulin?
Correct Answer: A
Reason: Pancreas secretes insulin hormone.
252. Which organ filters blood in humans?
Correct Answer: D
Reason: Kidneys filter waste materials from blood.
253. Which part of the flower develops into fruit?
Correct Answer: C
Reason: Ovary develops into fruit after fertilization.
254. Which vitamin deficiency causes rickets?
Correct Answer: B
Reason: Vitamin D deficiency affects bone development.
255. Which cell organelle is called the suicidal bag?
Correct Answer: D
Reason: Lysosomes contain digestive enzymes.
256. Which part of the brain controls involuntary actions?
Correct Answer: C
Reason: Medulla controls involuntary activities.
257. Which plant tissue transports food?
Correct Answer: B
Reason: Phloem transports prepared food.
258. Which gas is essential for respiration?
Correct Answer: A
Reason: Oxygen is required for cellular respiration.
259. Which microorganism causes malaria?
Correct Answer: C
Reason: Malaria is caused by Plasmodium parasite.
260. Which vitamin deficiency causes night blindness?
Correct Answer: A
Reason: Vitamin A is essential for vision.
261. Which organ stores urine temporarily?
Correct Answer: C
Reason: Urinary bladder stores urine before excretion.
262. Which enzyme digests proteins in the stomach?
Correct Answer: B
Reason: Pepsin digests proteins in acidic conditions.
263. Which blood vessel carries oxygenated blood from lungs to heart?
Correct Answer: D
Reason: Pulmonary vein carries oxygenated blood to the heart.
264. Which organelle is responsible for protein synthesis?
Correct Answer: A
Reason: Ribosomes are the sites of protein synthesis.
265. Which level of organization includes ecosystem?
Correct Answer: C
Reason: Ecosystem belongs to ecological level.
266. Which gas is used by plants in photosynthesis?
Correct Answer: B
Reason: Carbon dioxide is required for photosynthesis.
267. Which organ controls body balance?
Correct Answer: B
Reason: Cerebellum maintains posture and balance.
268. Which microorganism fixes atmospheric nitrogen?
Correct Answer: C
Reason: Rhizobium fixes nitrogen in legume roots.
269. Which vitamin is synthesized in skin by sunlight?
Correct Answer: D
Reason: Vitamin D is produced in the skin in sunlight.
270. Which part of the flower receives pollen?
Correct Answer: C
Reason: Stigma receives pollen grains.
Biology MCQs (241–270) FAQs
1. Are these MCQs based on NCERT?
Yes, these MCQs are strictly NCERT-based.
2. Are they useful for NEET and CUET?
Yes, they are designed for NEET, CUET, and board exams.
3. Do all MCQs include answers with reasons?
Yes, every question includes a short and clear reason.
4. How many MCQs should be practiced daily?
Practicing 20–30 MCQs daily is recommended.
5. Will the next part follow the same format?
Yes, all upcoming Biology MCQ parts will follow this exact pattern.
Yes, these MCQs are strictly NCERT-based.
2. Are they useful for NEET and CUET?
Yes, they are designed for NEET, CUET, and board exams.
3. Do all MCQs include answers with reasons?
Yes, every question includes a short and clear reason.
4. How many MCQs should be practiced daily?
Practicing 20–30 MCQs daily is recommended.
5. Will the next part follow the same format?
Yes, all upcoming Biology MCQ parts will follow this exact pattern.
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