What are the stacks of thylakoids called?

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Multiple Choice

What are the stacks of thylakoids called?

Explanation:
Grana are stacks of thylakoids. In chloroplasts, thylakoids are flattened membrane sacs where the light-dependent reactions occur. When many of these sacs are arranged in a stack, that structure is a granum, and multiple granal stacks form grana. This organization increases the surface area available for the photosystems, electron transport chain, and ATP synthase embedded in the thylakoid membranes. The surrounding fluid is the stroma, which hosts the Calvin cycle, while lamellae are the connecting membranes between granal stacks. Matrix is a mitochondrial term, not part of chloroplasts.

Grana are stacks of thylakoids. In chloroplasts, thylakoids are flattened membrane sacs where the light-dependent reactions occur. When many of these sacs are arranged in a stack, that structure is a granum, and multiple granal stacks form grana. This organization increases the surface area available for the photosystems, electron transport chain, and ATP synthase embedded in the thylakoid membranes. The surrounding fluid is the stroma, which hosts the Calvin cycle, while lamellae are the connecting membranes between granal stacks. Matrix is a mitochondrial term, not part of chloroplasts.

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