Transpiration is a necessary evil. It is necessary..understood...but how it is an evil?

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Transpiration is considered to be a necessary or unavoidable evil because it

  • 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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these points give the necessity of transpiration. but how it is an evil?

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