What do you mean by guard cells?
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Asked in Genetics, Chloroplasts
Why do guard cells need chloroplast and epidermis cells don't?
The presence of chloroplasts in the guard cells mean photosynthesis will occur. This leads to an accumulation of glucose in daylight and the guard cells will absorb water by osmosis from the epidermal cells which lack chloroplasts and do not produce glucoes. The guard cells becomes turgid and so the stoma opens to allow water loss.