Plants have a constant problem, they need to open their Stomata to let in CO2 to Photosynthesise, but at the same time don't want to lose water. So, some plants have special adaptions to reduce the amount of water lost!
Most leaves have a waxy, waterproof layer known as the Cuticle to prevent uncontrolled water loss. Most Stomata are found on the underside of the leaves, meaning they are not as exposed to the light and heat of the sun, reducing the time they are left open for.
If plants begin to lose water faster than it can be replaced by the roots, it will take Drastic measures. The plant can Wilt. This is where all the leaves collapse and hang down so the surface area for water loss by evaporation is greatly reduced.
The Stomata will close, which stops Photosynthesis and risks overheating. However this prevents most water loss and any further wilting. The plant will remain wilted until the Temperature drops, the sun goes or it rains.
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