Assertion–Reason (Soil & Earthworms): Assertion (A): Earthworms are not good for agriculture. Reason (R): Earthworms break down soil into fine particles and make it soft.

Introduction / Context:This item concerns the role of earthworms in soil health and agricultural productivity.

Given Data / Assumptions:

• A claims earthworms are not good for agriculture.
• R states earthworms fragment soil and loosen it.

Concept / Approach:Earthworms are widely recognized as beneficial: they aerate soil, enhance drainage, fragment organic matter, improve aggregation, and promote nutrient cycling (castings enrich soil). Their burrowing increases porosity, helping roots and water infiltration.

Step-by-Step Solution:1) A: False. Agronomy regards earthworms as “farmer’s friends.”2) R: True. By feeding and burrowing, worms create fine, friable soil and improve tilth.3) Hence “A false, R true.”

Verification / Alternative check:Observe vermicomposting and sustainable agriculture literature; earthworm activity correlates with improved soil structure and fertility.

Why Other Options Are Wrong:Any option treating A as true contradicts mainstream agronomy.

Common Pitfalls:Confusing earthworms with crop pests; overlooking context where excessive burrowing in very specific situations is a minor issue compared to overall benefits.

Final Answer:A is false but R is true.