Plants constantly make trade-offs in their decisions: more light means more opportunity for photosynthesis, but then hot temperatures and dry air makes wilting more likely. Stomata—microscopic valves on the surface of a leaf’s epidermis—are at the forefront of these trade-offs: stomata open to acquire fresh air (and the carbon dioxide in it) for photosynthesis, but water loss through stomatal pores causes plants to become dehydrated, and eventually to wilt.
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Source: Phys.org