Biology MCQs (421–450) with Answers and Reasons are designed for NEET, CUET, and Board examinations.
This MCQ set includes questions from Genetics, Evolution, Human Physiology, Ecology, and Cell Biology.
Practicing these MCQs helps improve conceptual clarity, accuracy, and exam confidence.
421. Which scientist proposed the theory of natural selection?
Correct Answer: B
Reason: Charles Darwin proposed natural selection.
422. Which blood cells are involved in immunity?
Correct Answer: B
Reason: White blood cells provide immunity.
423. Which part of the nephron filters blood?
Correct Answer: A
Reason: Glomerulus filters blood plasma.
424. Which cell organelle is responsible for respiration?
Correct Answer: C
Reason: Mitochondria carry out cellular respiration.
425. Which vitamin is essential for calcium absorption?
Correct Answer: D
Reason: Vitamin D helps absorb calcium.
426. Which hormone regulates water balance in the body?
Correct Answer: C
Reason: ADH regulates water reabsorption.
427. Which plant hormone promotes cell division?
Correct Answer: B
Reason: Cytokinin stimulates cell division.
428. Which microorganism is used in antibiotic production?
Correct Answer: A
Reason: Antibiotics like penicillin are produced by fungi.
429. Which part of the brain controls voluntary actions?
Correct Answer: A
Reason: Cerebrum controls voluntary actions.
430. Which process forms gametes?
Correct Answer: B
Reason: Meiosis produces haploid gametes.
431. Which blood vessel carries oxygenated blood from lungs?
Correct Answer: D
Reason: Pulmonary vein carries oxygenated blood.
432. Which enzyme digests starch?
Correct Answer: A
Reason: Amylase breaks starch into sugars.
433. Which plant tissue is dead at maturity?
Correct Answer: D
Reason: Sclerenchyma cells are dead at maturity.
434. Which disease is caused by deficiency of vitamin C?
Correct Answer: B
Reason: Vitamin C deficiency causes scurvy.
435. Which structure connects bones to bones?
Correct Answer: A
Reason: Ligaments connect bones to bones.
436. Which microorganism causes typhoid?
Correct Answer: A
Reason: Typhoid is caused by bacteria.
437. Which blood vessel carries deoxygenated blood to lungs?
Correct Answer: A
Reason: Pulmonary artery carries deoxygenated blood.
438. Which plant tissue is responsible for secondary growth?
Correct Answer: C
Reason: Cambium causes secondary growth.
439. Which hormone prepares the body for emergency?
Correct Answer: D
Reason: Adrenaline triggers fight-or-flight response.
440. Which gas is released during photosynthesis?
Correct Answer: C
Reason: Oxygen is released during photosynthesis.
441. Which organ stores urine?
Correct Answer: B
Reason: Urinary bladder stores urine.
442. Which part of the brain controls balance?
Correct Answer: C
Reason: Cerebellum maintains balance.
443. Which nutrient is required for tissue repair?
Correct Answer: C
Reason: Proteins help in growth and repair.
444. Which structure connects muscle to bone?
Correct Answer: B
Reason: Tendons attach muscles to bones.
445. Which microorganism causes malaria?
Correct Answer: C
Reason: Malaria is caused by Plasmodium.
446. Which blood vessel has the highest pressure?
Correct Answer: C
Reason: Arteries carry blood under high pressure.
447. Which plant tissue transports food?
Correct Answer: B
Reason: Phloem transports prepared food.
448. Which vitamin deficiency causes rickets?
Correct Answer: D
Reason: Vitamin D deficiency causes rickets.
449. Which organ produces insulin?
Correct Answer: B
Reason: Pancreas secretes insulin.
450. Which organelle contains digestive enzymes?
Correct Answer: D
Reason: Lysosomes contain digestive enzymes.
Biology MCQs (421–450) FAQs
1. Are these MCQs based on NCERT syllabus?
Yes, all questions are strictly NCERT based.
2. Are these MCQs useful for NEET?
Yes, these MCQs are helpful for NEET, CUET, and board exams.
3. Do all questions include answers and reasons?
Yes, every MCQ includes a clear answer with reason.
4. How many MCQs should be practiced daily?
Practicing 25–30 MCQs daily is ideal.
5. Will further parts follow the same format?
Yes, all upcoming Biology MCQ parts will follow the same pattern.
Yes, all questions are strictly NCERT based.
2. Are these MCQs useful for NEET?
Yes, these MCQs are helpful for NEET, CUET, and board exams.
3. Do all questions include answers and reasons?
Yes, every MCQ includes a clear answer with reason.
4. How many MCQs should be practiced daily?
Practicing 25–30 MCQs daily is ideal.
5. Will further parts follow the same format?
Yes, all upcoming Biology MCQ parts will follow the same pattern.
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