BI-719
Carbon dioxide entering the leaf
Biology · Secondary 3 · Medium · Carbon dioxide entering the leaf
Which statement correctly describes how carbon dioxide enters a leaf for photosynthesis?
- It is pumped into the leaf by xylem vessels.
- It diffuses through stomata into air spaces and then into mesophyll cells.
- It is carried into the leaf dissolved in phloem sap.
- It enters only through the cuticle by osmosis.
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