Read the assertion and reason carefully to mark the correct option in question.

Assertion: The $N A D P$ reductase enzyme is located on the stroma side of the membrane of thylakoid.

Reason: During proton accumulation in lumen, there is a measurable decrease in $p H$ in the stroma.

If both assertion and reason are true and the reason is the correct explanation of the assertion.

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

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If assertion is true but the reason is false.

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If both assertion and reason are false.

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Solution

The correct option is C If assertion is true but the reason is false.
Assertion-Reason relation

The thylakoid membrane contains the $N A D P$ reductase enzyme towards the side of stroma.

It converts $N A D P +$ to $N A D P H$ during the light reaction.

Hence, the given assertion statement is true.

Assertion-Reason relation

A proton gradient is formed across the thylakoid membrane during the light reaction, making the thylakoid lumen acidic.

This proton gradient drives $A T P$ production.

The accumulation of proton occurs in the lumen of thylakoid which decreases its $p H$ .

Hence, the given reason statement is false.

Final answer

(C) If assertion is true but the reason is false.

Suggest Corrections

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ATP Synthase

Standard XII Biology

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Read the assertion and reason carefully to mark the correct option in question. Assertion: The NADP reductase enzyme is located on the stroma side of the membrane of thylakoid. Reason: During proton accumulation in lumen, there is a measurable decrease in pH in the stroma.

Read the assertion and reason carefully to mark the correct option in question.

Assertion: The $N A D P$ reductase enzyme is located on the stroma side of the membrane of thylakoid.

Reason: During proton accumulation in lumen, there is a measurable decrease in $p H$ in the stroma.