transpiration is the evaporation of water from a plants surface, especially the leaves.
- water evaporates from the moist cell walls and accumulates in the space between cells in the leaf.
- when the is stomata open, it moves out of the leaf down the concentration gradient (theres more water inside the leaf than in the air outside)
transpiration is really a side effect of photosynthesis - the plant needs to open its stomata to let in CO2 so that it can produce glucose, but this also lets water out.
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