Biology MCQs (301–330) with Answers and Reasons are designed for NEET, CUET, and Board examinations.
This MCQ set includes questions from Human Physiology, Genetics, Plant Physiology, Ecology, and Cell Biology.
Daily practice of these questions helps improve speed, accuracy, and conceptual understanding.
301. Which part of the human brain controls balance and posture?
Correct Answer: B
Reason: Cerebellum maintains balance, posture, and coordination.
302. Which hormone regulates the menstrual cycle?
Correct Answer: C
Reason: Estrogen regulates female reproductive cycle.
303. Which blood vessel carries blood towards the heart?
Correct Answer: A
Reason: Veins carry blood towards the heart.
304. Which organelle contains chlorophyll?
Correct Answer: D
Reason: Chloroplast contains chlorophyll for photosynthesis.
305. Which vitamin is essential for vision?
Correct Answer: A
Reason: Vitamin A is required for normal vision.
306. Which part of the nephron is responsible for reabsorption?
Correct Answer: B
Reason: Nephron tubules reabsorb useful substances.
307. Which plant hormone promotes stem elongation?
Correct Answer: B
Reason: Gibberellins promote stem elongation.
308. Which microorganism is used in alcohol production?
Correct Answer: C
Reason: Yeast converts sugar into alcohol by fermentation.
309. Which part of the eye controls the size of pupil?
Correct Answer: D
Reason: Iris controls pupil diameter.
310. Which gas is released during photosynthesis?
Correct Answer: C
Reason: Oxygen is released as a by-product of photosynthesis.
311. Which blood group is known as universal donor?
Correct Answer: D
Reason: Blood group O can donate to all groups.
312. Which enzyme digests proteins in the stomach?
Correct Answer: B
Reason: Pepsin digests proteins in acidic medium.
313. Which plant tissue transports water?
Correct Answer: A
Reason: Xylem conducts water and minerals.
314. Which disease is caused by virus?
Correct Answer: C
Reason: AIDS is caused by HIV virus.
315. Which organ stores bile?
Correct Answer: B
Reason: Gall bladder stores bile produced by liver.
316. Which vitamin deficiency causes rickets?
Correct Answer: B
Reason: Vitamin D deficiency affects bone development.
317. Which cell organelle is known as the powerhouse of the cell?
Correct Answer: C
Reason: Mitochondria produce ATP energy.
318. Which part of the flower develops into fruit?
Correct Answer: C
Reason: Ovary develops into fruit after fertilization.
319. Which gas is released during respiration?
Correct Answer: B
Reason: Carbon dioxide is released during respiration.
320. Which part of the ear helps in hearing?
Correct Answer: A
Reason: Cochlea converts sound vibrations into nerve signals.
321. Which nutrient is the main source of energy?
Correct Answer: A
Reason: Carbohydrates provide immediate energy.
322. Which structure connects muscles to bones?
Correct Answer: B
Reason: Tendons attach muscles to bones.
323. Which microorganism causes malaria?
Correct Answer: C
Reason: Malaria is caused by Plasmodium parasite.
324. Which blood vessel carries oxygenated blood from lungs to heart?
Correct Answer: D
Reason: Pulmonary vein carries oxygenated blood.
325. Which plant tissue transports food?
Correct Answer: B
Reason: Phloem transports prepared food.
326. Which vitamin deficiency causes scurvy?
Correct Answer: C
Reason: Vitamin C deficiency causes scurvy.
327. Which organ stores urine temporarily?
Correct Answer: B
Reason: Urinary bladder stores urine.
328. Which part of the brain regulates body temperature?
Correct Answer: D
Reason: Hypothalamus regulates body temperature.
329. Which organism fixes atmospheric nitrogen?
Correct Answer: C
Reason: Rhizobium fixes nitrogen in leguminous plants.
330. Which cell organelle contains digestive enzymes?
Correct Answer: D
Reason: Lysosomes contain digestive enzymes.
Biology MCQs (301–330) FAQs
1. Are these MCQs useful for NEET?
Yes, these questions are NCERT-based and NEET oriented.
2. Do all MCQs include answers with reasons?
Yes, each MCQ includes a clear answer with a reason.
3. Which topics are covered in this part?
Human physiology, plant physiology, genetics, and ecology.
4. Can board students use these MCQs?
Yes, these MCQs are useful for board examinations.
5. Will the next part follow the same format?
Yes, all upcoming Biology MCQ parts will follow the same pattern.
Yes, these questions are NCERT-based and NEET oriented.
2. Do all MCQs include answers with reasons?
Yes, each MCQ includes a clear answer with a reason.
3. Which topics are covered in this part?
Human physiology, plant physiology, genetics, and ecology.
4. Can board students use these MCQs?
Yes, these MCQs are useful for board examinations.
5. Will the next part follow the same format?
Yes, all upcoming Biology MCQ parts will follow the same pattern.
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