Back to your test review

Assertion (A): The thylakoid lumen becomes acidic during the light reaction.
Reason (R): Protons from water splitting and from the hydrogen carrier accumulate in the lumen.

(a) Both A and R are true, and R is the correct explanation of A. Correct
(b) Both A and R are true, but R is not the correct explanation of A. Your answer
(c) A is true but R is false. Your answer
(d) Both A and R are false. Your answer

Your answer: Correct answer: (a)

Advertisement

Explanation

Why (a) is correct

Both are true and R explains A. Protons from water splitting and from the hydrogen carrier collect in the lumen, so its pH falls (it becomes acidic).

Why the other options are wrong

(b) · your answer R is the cause of A.
(c) · your answer R is true.
(d) · your answer Both are true.

NCERT point: The acidic lumen provides the proton gradient for ATP synthesis.

Thank you! We will check this question.

Practise Photosynthesis in Higher Plants

Take a free 15-question NEET Biology test on this chapter. Timed, scored instantly.

Start free test

Similar questions

Assertion (A): Stroma lamellae can produce ATP but not NADPH.Reason (R): Stroma lamellae lack PS I. Match List I with List II.List IList IIP. PS II1. Reduces NADP+Q. NADP reductase2. Water-splitting complexR. CF03. Proto… Which of the following would NOT occur in a chloroplast in which PS II has been blocked but PS I is working normally?