Question

This question consist of two statements, assertion and reason. While answering this question you are required to choose any one of the following five responses.

Assertion: The stromal thylakoids are rich in both PS I and PS II.

Reason: The stroma membranes are rich in ATP synthetase.

• A. If both assertion and reason are true but the reason is not the correct explanation of the assertion.
• B. If assertion is false but the reason is true.
• C. If both assertion and reason are true and the reason is the correct explanation of the assertion.
• D. If assertion is true but the reason is false.
• E. If both assertion and reason are false.

Answer 1

The correct option is E If both assertion and reason are false.

Assertion-Reason relation

The photosystems are arranged on the thylakoid membrane:

Photosystem II is located predominantly in the granal thylakoid membrane.

Photosystem I is found in both the stromal and granal lamellae.

Assertion-Reason relation

ATP synthases are mostly located in the non-appressed regions of grana and some fractions of the stroma lamellae.

However, the stroma membranes are not rich in ATP synthetases.

So, both assertion and reason are incorrect.

Final answer

(D) If both assertion and reason are false.