Question

Assertion (A): In terrestrial ecosystem much larger fraction of energy flows through grazing food chain.

Reason (R): Grazing food chain may be connected to Detritus food chain at some levels.

Options

• Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation for Assertion (A).

• Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation for Assertion (A).

• Assertion (A) is true, but Reason (R) is false.

• Assertion (A) is false, but Reason (R) is true.

Answer 1

Assertion (A) is false, but Reason (R) is true.

Explanation:

The assertion is false, and the reason is true. In most terrestrial ecosystems, a large part of primary production becomes litter and dead organic matter and is processed mainly by the detritus (decomposer) food chain rather than by the grazing chain; microbes/saprotrophs obtain energy by decomposing dead remains. us chains are often linked (via herbivore faeces, carcasses, trophic links and food‑web connections), so the reason is correct, but it does not make the assertion true.