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Large amount of water are transpired to the atmosphere making the situation for fresh water worse.But it is necessary for the health development of the plant .It causes the sap to move and causes cooling in plant.So transpiration is necessary evil.

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12y ago
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10y ago

At any one time, the stomata may prevent water vapor from escaping the cell by remaining closed, or allow carbon dioxide to enter the cell by opening. Both are H2O and CO2 are vital for photosynthesis, but the stomata controls their presence in the cell.

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Q: Why is stomata called the necessary evil?
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