Which condition can increase a plant's rate of transpiration

Open stomata can increase the plants rate of transpiration.
Transpiration refer to the process by which water move all through the plant and its evaporated from aerial parts like leaves, stems and flowers. Water is very essential for plants but only a small amount of water taken up by the roots and this is use for plants growth and metabolism. The remaining 97–99.5% is lost by transpiration and guttation.
Open stomata allow the evaporation of water to the atmosphere.
Therefore, Open stomata can increase the plants rate of transpiration.
Learn more about transpiration from the link below.
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