Q1. [1] § 13.1 ECO-SYSTEM — WHAT ARE ITS COMPONENTS? § 13.2.2 Managing the Garbage we Produce
Assertion (A) : Natural replenishment of soil will not take place in absence of microbes.
Reason (R) : Microbes, comprising of bacteria and fungi, break down dead remains and waste products of organisms, and they go into the soil.
- (A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
- (B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
- (C) Assertion (A) is true, but Reason (R) is false.
- (D) Assertion (A) is false, but Reason (R) is true.
Previously asked in CBSE board exam
2026 31/3/1 Q8
Generated by claude-sonnet-4-6 · 2026-06-15 06:42 · grounding rag
Model Answer
(A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
Microbes (bacteria and fungi) decompose dead organic matter, returning nutrients to the soil, thus enabling its natural replenishment.
Explanation
The Reason directly explains why the Assertion is true — without microbial decomposition, dead matter would not break down and nutrients would not be returned to the soil, so replenishment would stop. Option (A) is correct because R is not just true but is the cause behind A. Remember: choose (B) only when R is true but explains something else, not the assertion itself.
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