Q18
1 markMCQSection Section A

Assertion (A) : The energy which passes to the herbivores does not come back to autotrophs.

Reason (R) : The flow of energy in a food chain is unidirectional.

Our Environment
Flow of Energy in an Ecosystem

Options

(a)Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of (A).
(b)Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of (A).
(c)Assertion (A) is true, but Reason (R) is false.
(d)Assertion (A) is false, but Reason (R) is true.
Official Answer

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

unidirectionalenergyautotrophsherbivores

Marking Scheme

  • 11 mark

Hint

Recall the concept of flow of energy in an ecosystem.

Quick Oral Answer

The flow of energy in a food chain is unidirectional, meaning that energy cannot be transferred back to the previous trophic level. This is why the energy which passes to the herbivores does not come back to autotrophs.

Analysis & Explanation

The assertion states that the energy which passes to the herbivores does not come back to autotrophs. This is true because the flow of energy in a food chain is unidirectional. The reason states that the flow of energy in a food chain is unidirectional, which is also true. Therefore, both the assertion and reason are true, and the reason is the correct explanation of the assertion.

Common Mistakes

  1. 1thinking that energy can flow back to autotrophs

Interesting Facts

the flow of energy in an ecosystem is unidirectional, meaning that energy cannot be transferred back to the previous trophic level

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Frequently Asked Questions

How many marks does this question carry in CBSE Class 10 Science 2023?

This question carries 1 mark in the CBSE Class 10 Science 2023 examination.

Which chapter does this question come from in Science?

This question is from the chapter "Our Environment" in the CBSE Class 10 Science syllabus.

What topic does this question cover in Science?

This question covers the topic "Flow of Energy in an Ecosystem" from CBSE Class 10 Science.

What type of question is this in the CBSE Class 10 Science 2023 paper?

This is a MCQ question from Section Section A in the CBSE Class 10 Science 2023 paper.