Transpiration is considered to be a necessary or unavoidable evil because it leads to loss of water from plants but provides the plant with several advantages as well.
- Creates transpirational pull for transport
- Supplies water for photosynthesis
- Transports minerals from soil to all parts of a plant
- Cools the surface of the leaves (due to the evaporation of water)
- Keeps the cells turgid; hence, maintains their shape
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