Question

how does the loss of water help the plants

Answer 1

POP-UP –Many plant leaves have stomata only on their lower surface to help avoid water loss. ... Stomata – Stomata are pores in the leaf that allow gas exchange where water vapor leaves the plant and carbon dioxide enters. Special cells called guard cells control each pore's opening or closing.
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Answer 2

leaves are adapted for photosynthesis by having a large surface area, and contain stomata to allow carbon dioxide into the leaf. These design features can result in the leaf losing a lot of water. The cells inside the leaf have water on their surface