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The structures that are formed by stacking of organized flattened membranous sacs in the chloroplasts are:

1. Grana
2. Stroma lamellae
3. Stroma
4. Cristae

Correct answer: Grana

Solution

Grana are stacks of thylakoids, the flattened membranous sacs in chloroplasts. Stroma is the fluid matrix, stroma lamellae connect grana, and cristae are found in mitochondria.

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