Assertion (A): Kidneys regulate blood pH. Reason (R): Selective reabsorption of H⁺ and HCO₃⁻ occurs — NEET Chemistry Past Papers Chemistry Question

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Assertion (A): Kidneys regulate blood pH. Reason (R): Selective reabsorption of H⁺ and HCO₃⁻ occurs in kidney. (A) Both true, R explains A (B) Both true, R does not explain A (C) A true, R false (D) A false, R true 100. Which statements are correct when comparing Lamarckism and Darwinism? A. Lamarckism proposes inheritance of acquired characters. B. Darwinism explains variations arise by natural selection acting on random variations. C. Both theories accept that organisms change over time. D. Modern synthesis incorporates only Darwinian natural selection and rejects Lamarckism completely. (1) A, B and D (2) A, B and C (3) B, C and D (4) A, B, C and D 101. Match the scientist with contribution: Column-I Column-II A Oparin i Coacervates B Miller ii Amino acids in simulated atmosphere C Hugo de Vries iii Mutation theory D Hardy-Weinberg iv Genetic equilibrium (1) A-i, B-ii, C-iv, D-iii (2) A-iii, B-i, C-iv, D-ii (3) A-ii, B-i, C-iii, D-iv (4) A-i, B-ii, C-iii, D-iv 102. Dryopithecus is considered ancestor of - (1) Modern man (2) Ape and man (3) Only apes (4) Only monkeys 103. Population density can be measured as: (1) Number of individuals per unit area only (2) Biomass per unit area only (3) Percentage cover or frequency (4) All of the above 104. Assertion (A): Lichens represent an obligate mutualistic relationship. Reason (R): Algae provide shelter and fungi provide food. (1) Both Assertion and Reason are true and Reason is the correct explanation of Assertion (2) Both Assertion and Reason are true but Reason is not the correct explanation (3) Assertion is true but Reason is false (4) Assertion is false but Reason is true 105. Match the columns Column I Column II A. Predator–prey relationship