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Which of the following is NOT found in the stroma of a chloroplast?

(a) the enzyme RuBisCO Your answer
(b) the water-splitting complex Correct
(c) 70S ribosomes Your answer
(d) circular chloroplast DNA Your answer

Your answer: Correct answer: (b)

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Explanation

Why (b) is correct

The water-splitting complex is part of PS II on the thylakoid membrane (facing the lumen), not in the stroma.

Why the other options are wrong

(a) · your answer RuBisCO is in the stroma.
(c) · your answer 70S ribosomes are found in the stroma.
(d) · your answer Circular DNA is found in the stroma.

NCERT point: Chloroplasts are semi-autonomous: they have their own DNA and ribosomes in the stroma.

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