Question

Assertion: Biotic and abiotic components constitute an ecosystem.

Reason: The sun is the ultimate source of energy in an ecosystem.

• A. Both the assertion and reason are true and the reason is the correct explanation of the assertion
• B. Both the assertion and reason are true but the reason is not the correct explanation of the assertion
• C. Assertion is true but the reason is false
• D. Both the assertion and reason are false

Answer 1

The correct option is B Both the assertion and reason are true but the reason is not the correct explanation of the assertion

An ecosystem consists of all the organisms and the physical environment with which they interact. These biotic and abiotic components are linked together through nutrient cycles and energy flows.

The interaction between biotic and abiotic components which constitute the ecosystem is so specific that it forms a clear flow of energy through different trophic levels and at the end recycling of nutrients happens through decomposition.

Food is the source of energy for all the trophic levels except the first trophic level which is occupied by the producers which trap the solar radiation energy and convert it into chemical energy. So the sun is the ultimate source of energy in the ecosystem.

Thus both the assertion and reason are true, but the reason is not the correct explanation of the assertion.