What term describes the photosynthetic structure described as 'a stack of pancakes'?

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Multiple Choice

What term describes the photosynthetic structure described as 'a stack of pancakes'?

Explanation:
Grana are stacks of thylakoid membranes inside the chloroplast. The phrase “a stack of pancakes” describes how these thylakoids are organized: flat, disk‑shaped sacs packed into vertical stacks. This arrangement increases the surface area available for the light-dependent reactions, where chlorophyll captures light and drives the production of ATP and NADPH. The whole chloroplast contains thylakoids and the surrounding stroma, while a photosystem I is a specific protein complex located in the thylakoid membrane, not a stack. Therefore, the term that fits the description of a stack of pancakes is grana.

Grana are stacks of thylakoid membranes inside the chloroplast. The phrase “a stack of pancakes” describes how these thylakoids are organized: flat, disk‑shaped sacs packed into vertical stacks. This arrangement increases the surface area available for the light-dependent reactions, where chlorophyll captures light and drives the production of ATP and NADPH. The whole chloroplast contains thylakoids and the surrounding stroma, while a photosystem I is a specific protein complex located in the thylakoid membrane, not a stack. Therefore, the term that fits the description of a stack of pancakes is grana.

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