Where in a leaf does most photosynthesis take place?

Answer and explanation

Correct answer: C. Palisade mesophyll

Palisade cells are tightly packed under the upper epidermis and have many chloroplasts.
Answer: Palisade mesophyll.
Why not the others: Lower epidermis: it contains few chloroplasts. Spongy mesophyll: it contains fewer chloroplasts than the palisade layer. Xylem: it carries water.

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