Plz explain why is transpiration a necessary evil?
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The loss of water in the form of vapour from aerial parts of the plant is called transpiration. Transpiration is said to be a necessary evil because it is an inevitable, but potentially harmful, consequence of the existence of wet cell surfaces form which evaporation occurs. Loss of water from the plant results wilting, serious desiccation and often death of a plant if a condition of drought is experienced. There is strong evidence that even mild water stress results in reduced growth rate and in crops to economic losses through reduction of yield.
Despite its apparent inevitability, transpiration is also of great significance for the plant.
Water is conducted in most tall plants due to transpiration pull.
Minerals dissolved in water are distributed throughout plant body by transpiration stream.
Evaporation of water from the exposed surface of cells of leaves has cooling effect on plant. Wet surface of leaf cells allow gaseous exchange.Transpiration affects indirectly the processes of respiration and photosynthesis.
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Answer:
Transpiration has both advantages and disadvantages as well, to plants. So it is a 'necessary evil'.
A.
- It creates 'transpiration pull' for absorption and transportation of water in plants.
- It supplies water for photosynthesis.
- It transports minerals from the soil to all parts of the plant.
- It cools leaf surfaces by evaporative cooling.
- It maintains the shape and structure of plants by keeping cells turgid.
B.
- Excessive transpiration makes the cells flacid.
- This retards growth of the plants.
- More amount of water is evaporated by transpiration.
- Thus photosynthesis is limited by the available water .
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