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Science (086) — AI-generated practice question

AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.

Q1. [1] medium exam-ready
Assertion (A): Variants that are better suited to their environment survive and reproduce more successfully than others. Reason (R): All variants in a population have equal chances of surviving regardless of the environment.
  1. A Both A and R are true, and R is the correct explanation of A
  2. B Both A and R are true, but R is NOT the correct explanation of A
  3. C A is true but R is false
  4. D A is false but R is true
Generated by claude-sonnet-4-6 · 2026-06-26 01:03 · grounding rag
Model Answer

Option C: A is true but R is false.

Assertion is correct — better-suited variants survive and reproduce more. Reason is false — variants do NOT have equal survival chances; environment selects favourably adapted ones.

Explanation

The textbook explicitly states: "Do all these variations have equal chances of surviving? Obviously not." Environmental selection favours better-adapted variants (e.g., heat-resistant bacteria survive a heat wave). This directly contradicts Reason R, making C the correct choice.

Previous-year CBSE Grade 10 board exam questions, organised by subject and chapter, each with a model answer — free to read and print.