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🅰️ ASSERTION–REASON (A/R) MCQs (Used standard options A–D pattern as in CBSE/JKBOSE) Options (Same for ALL A/R questions): A. Both Assertion and Reason are true and Reason is the correct explanation of AssertionB. Both Assertion and Reason are true but Reason is NOT the correct explanationC. Assertion is true but Reason is falseD. Assertion is […]

CASE STUDY–1: Bacterial Population A population of bacteria was exposed to high temperature. Most bacteria died, but a few survived and reproduced. After some time, the population consisted mainly of heat-resistant bacteria. CS-1.1 The surviving bacteria lived because they hadA. No variationsB. Useful variationsC. Perfect DNAD. Larger size Answer: B CS-1.2 The heat-resistant trait was

Q1. Reproductive processes give rise to new individuals that are A. Completely identicalB. Completely differentC. Similar but subtly differentD. Unrelated Answer: C. Similar but subtly different Q2. Variation is produced during A. Only sexual reproductionB. Only asexual reproductionC. Both asexual and sexual reproductionD. Only growth Answer: C. Both asexual and sexual reproduction Q3. Sexual reproduction

Q1. Reproductive processes give rise to new individuals that areA. Completely identicalB. Completely differentC. Similar but subtly differentD. Unrelated ANSWER: Similar but subtly different Q2. Variation is produced duringA. Only sexual reproductionB. Only asexual reproductionC. Both asexual and sexual reproductionD. Only growth ANSWER: Both asexual and sexual reproduction Q3. Sexual reproduction maximises the number ofA.

Biology MCQ Quiz 🔄 RESET & RESHUFFLE 📊 SHOW RESULTS 🔍 REVEAL ANSWERS ✅ 0 ❌ 0 📝 0 Quiz Results × Total Questions 50 Attempted 0 Unattempted 50 Correct 0 Wrong 0 Percentage 0% Your Grade F Your Name (Optional) Date: Reshuffles: 0 ✉️ SHARE VIA EMAIL 📥 DOWNLOAD SUMMARY (CSV)

Biology MCQ Quiz 🔄 RESET & RESHUFFLE 📊 SHOW RESULTS 🔍 REVEAL ANSWERS ✅ 0 ❌ 0 📝 0 Quiz Results × Total Questions 50 Attempted 0 Unattempted 50 Correct 0 Wrong 0 Percentage 0% Your Grade F Your Name (Optional) Date: Reshuffles: 0 ✉️ SHARE VIA EMAIL 📥 DOWNLOAD SUMMARY (CSV)

1. Lack of oxygen in muscles converts pyruvate into (A) Ethanol(B) Lactic acid(C) Glucose(D) Acetic acid Answer: B – Lactic acidExplanation: In anaerobic respiration in muscles, pyruvate is converted to lactic acid to produce energy when oxygen is insufficient. 2. Lactic acid is a (A) Two-carbon compound(B) Three-carbon compound(C) Four-carbon compound(D) Six-carbon compound Answer: B

*1. Normal haemoglobin content differs between (A) Humans and birds(B) Animals and plants(C) Children and adults(D) Fish and reptilesANSWER: Children and adults** Explanation: Correct (C): Haemoglobin increases with age; adults have higher Hb than children, so levels differ.Wrong:(A) Humans & birds have completely different physiology, not normal Hb comparison.(B) Plants do not have haemoglobin at

Explanation:Why (B) Transpiration is correct: Transpiration is the biological process by which plants lose water vapour, mainly through stomata in leaves.Why the others are wrong: (A) Respiration is the metabolic process of releasing energy from food, not water loss. (C) Evaporation is a general physical process of liquid becoming vapour — transpiration is the biological

1. The basic unit of the kidney is (A) Alveolus(B) Nephron(C) Villus(D) AlveoliANSWER: Nephron ✔ Why Nephron is correct:The nephron is the structural and functional unit of the kidney. It filters blood, forms urine, and maintains water and salt balance. ✘ Why others are wrong:(A) Alveolus – Found in lungs, used for gas exchange.(C) Villus