Question

Assertion: The first living organisms were heterotrophs.

Reason: They were surrounded by preformed organic molecules which they used as food.

Read the assertion and reason statements carefully and answer the question on the basis of the following options.

• A. Assertion is True, Reason is True; Reason is a correct explanation for Assertion.
• B. Assertion is True, Reason is True; Reason is not a correct explanation for Assertion.
• C. Assertion is True, Reason is False.
• D. Assertion is False, Reason is True.

Answer 1

The correct option is A

Assertion is True, Reason is True; Reason is a correct explanation for Assertion.

Correct option is (a)-

Assertion Statement :

1. First living organisms derive their food from organic molecules, so the first living organisms are chemoheterotrophs.
2. So the assertion is true.

Reason Statement:

1. The first form of life developed in organic molecules in an oxygen-free environment.
2. They used organic molecules as their food.
3. The first living organisms were heterotrophs because they were surrounded by preformed organic molecules, which they used as food.
4. So the assertion is true, and the reason is a correct explanation of the assertion.

Final Answer: (a) Assertion is True, Reason is True; Reason is a correct explanation for Assertion.