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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_reason] Assertion (A): Among all organisms in a food chain, the highest concentration of pesticides is found in organisms at the highest trophic level. Reason (R): Non-degradable pesticides get accumulated progressively at each trophic level through biological magnification, so organisms at higher trophic levels accumulate greater concentrations. Options: (A) Both A and R are true and R is the correct explanation of A. (B) Both A and R are true but R is not the correct explanation of A. (C) A is true but R is false. (D) A is false but R is true.
  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 00:59 · grounding rag
Model Answer

(A) Both A and R are true and R is the correct explanation of A.

Non-degradable pesticides accumulate at each trophic level through biological magnification, so the highest trophic level organisms accumulate maximum concentration.

Source: Chapter 13, Section 13.1.1 (Food Chains and Webs)

Explanation

The textbook explicitly states: "As these chemicals are not degradable, these get accumulated progressively at each trophic level. As human beings occupy the top level in any food chain, the maximum concentration of these chemicals get accumulated in our bodies." This directly confirms both A and R, and R correctly explains A. Option (A) is the answer.

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