Biology MCQs (391–420) with Answers and Reasons are prepared for NEET, CUET, and Board exams.
This MCQ set covers Cell Biology, Human Physiology, Plant Physiology, Genetics, and Ecology.
Practicing these questions improves concept clarity and exam performance.
391. Which cell organelle is involved in protein synthesis?
Correct Answer: C
Reason: Ribosomes are the site of protein synthesis.
392. Which hormone lowers blood sugar level?
Correct Answer: A
Reason: Insulin decreases blood glucose level.
393. Which blood vessel carries blood away from the heart?
Correct Answer: B
Reason: Arteries carry blood away from the heart.
394. Which pigment is responsible for photosynthesis?
Correct Answer: A
Reason: Chlorophyll traps light energy.
395. Which vitamin deficiency causes beriberi?
Correct Answer: B
Reason: Vitamin B1 (thiamine) deficiency causes beriberi.
396. Which organ produces bile?
Correct Answer: A
Reason: Liver produces bile.
397. Which plant hormone promotes leaf fall?
Correct Answer: D
Reason: Abscisic acid causes leaf fall and dormancy.
398. Which microorganism is used in vaccine production?
Correct Answer: B
Reason: Vaccines are prepared using weakened viruses.
399. Which part of the eye focuses light?
Correct Answer: C
Reason: Lens focuses light on retina.
400. Which process releases energy in cells?
Correct Answer: B
Reason: Respiration releases energy from food.
401. Which blood group can donate to AB group?
Correct Answer: D
Reason: AB group can receive blood from all groups.
402. Which enzyme digests proteins in intestine?
Correct Answer: C
Reason: Trypsin digests proteins in small intestine.
403. Which plant tissue provides mechanical support?
Correct Answer: B
Reason: Collenchyma provides support and flexibility.
404. Which disease is caused by protozoa?
Correct Answer: C
Reason: Malaria is caused by protozoan Plasmodium.
405. Which organ regulates metabolism?
Correct Answer: B
Reason: Thyroxine hormone regulates metabolism.
406. Which vitamin deficiency causes night blindness?
Correct Answer: A
Reason: Vitamin A is essential for vision.
407. Which organelle modifies and packages proteins?
Correct Answer: C
Reason: Golgi apparatus modifies and packages proteins.
408. Which part of the flower produces pollen?
Correct Answer: D
Reason: Anther produces pollen grains.
409. Which gas is taken in during respiration?
Correct Answer: A
Reason: Oxygen is needed for cellular respiration.
410. Which part of the ear transmits sound vibrations?
Correct Answer: B
Reason: Ear drum transmits sound vibrations.
411. Which nutrient helps in body building?
Correct Answer: C
Reason: Proteins are needed for growth and repair.
412. Which structure connects muscles to bones?
Correct Answer: B
Reason: Tendons connect muscles to bones.
413. Which microorganism causes cholera?
Correct Answer: A
Reason: Cholera is caused by bacteria.
414. Which blood vessel carries deoxygenated blood?
Correct Answer: A
Reason: Veins generally carry deoxygenated blood.
415. Which plant tissue is responsible for growth?
Correct Answer: D
Reason: Meristematic tissue causes growth.
416. Which disease is caused by deficiency of iodine?
Correct Answer: C
Reason: Iodine deficiency causes goitre.
417. Which organelle is known as suicide bag?
Correct Answer: B
Reason: Lysosomes contain digestive enzymes.
418. Which part of flower develops into fruit?
Correct Answer: C
Reason: Ovary develops into fruit.
419. Which gas is released during respiration?
Correct Answer: B
Reason: Carbon dioxide is released during respiration.
420. Which organ maintains balance in humans?
Correct Answer: C
Reason: Cerebellum maintains balance and posture.
Biology MCQs (391–420) FAQs
1. Are these MCQs useful for NEET?
Yes, these MCQs are fully NEET-oriented and NCERT-based.
2. Do all MCQs include reasons?
Yes, every question has a clear answer with reason.
3. Which topics are covered in this part?
Cell Biology, Human Physiology, Plant Physiology, Genetics, and Ecology.
4. Can school students use these MCQs?
Yes, these MCQs are useful for board exams as well.
5. Will the next part follow the same format?
Yes, all upcoming parts will follow this same interactive format.
Yes, these MCQs are fully NEET-oriented and NCERT-based.
2. Do all MCQs include reasons?
Yes, every question has a clear answer with reason.
3. Which topics are covered in this part?
Cell Biology, Human Physiology, Plant Physiology, Genetics, and Ecology.
4. Can school students use these MCQs?
Yes, these MCQs are useful for board exams as well.
5. Will the next part follow the same format?
Yes, all upcoming parts will follow this same interactive format.
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