What is the term for a stack of thylakoids inside a chloroplast?

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Multiple Choice

What is the term for a stack of thylakoids inside a chloroplast?

Explanation:
Grana are stacks of thylakoid membranes inside a chloroplast. Each granum is a single stack, and a chloroplast typically contains many grana connected by lamellae. The light-dependent reactions occur in the thylakoid membranes, while the surrounding fluid, the stroma, hosts the Calvin cycle. The term stroma refers to the fluid, not the stacked structure; thylakoids are the individual sacs themselves, and membranes is too general. So grana is the correct label for the stacked arrangement inside the chloroplast.

Grana are stacks of thylakoid membranes inside a chloroplast. Each granum is a single stack, and a chloroplast typically contains many grana connected by lamellae. The light-dependent reactions occur in the thylakoid membranes, while the surrounding fluid, the stroma, hosts the Calvin cycle. The term stroma refers to the fluid, not the stacked structure; thylakoids are the individual sacs themselves, and membranes is too general. So grana is the correct label for the stacked arrangement inside the chloroplast.

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