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QuestionBiology

"Where does photosynthesis occur in a leaf? State which organelles carry out photosynthesis and which type or types of leaf cells have this organelle."
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Step 1:
: Photosynthesis is a process that occurs in the chloroplasts of plant cells.

Chloroplasts contain chlorophyll, a pigment that absorbs light energy used in photosynthesis.

Step 2:
: In a leaf, photosynthesis primarily occurs in the palisade mesophyll cells, which are located in the upper layers of the leaf.

These cells contain numerous chloroplasts and are exposed to more sunlight.

Step 3:
: The spongy mesophyll cells, located in the lower layers of the leaf, also contain chloroplasts and contribute to photosynthesis, but to a lesser extent than the palisade mesophyll cells.

Final Answer

Photosynthesis occurs in the chloroplasts of palisade mesophyll cells and, to a lesser extent, spongy mesophyll cells in a leaf.