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The stacks of flattened membranous sacs in the chloroplast are called

(a) stroma lamellae Your answer
(b) grana Correct
(c) stroma Your answer
(d) cristae Your answer

Your answer: Correct answer: (b)

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Explanation

Why (b) is correct

Within the chloroplast, flattened membranous sacs (thylakoids) are stacked like piles of coins. These stacks are called grana.

Why the other options are wrong

(a) · your answer Stroma lamellae are flat membranes connecting the grana, not stacks.
(c) · your answer The stroma is the fluid matrix around the thylakoids.
(d) · your answer Cristae are the infoldings of the inner mitochondrial membrane.

NCERT point: Grana carry PS I and PS II; the stroma holds the Calvin cycle enzymes.

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