Why Is Transpiration Also Known As A 'necessary Evil'?

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Answer:
The loss of excess water in the form of water haze through evaporation from the  surface of the internal tissues of the aerial parts of plants especially leaves, is known as Transpiration.

Since water is one of the most central compounds needed for various important life processes, a loss of marine by transpiration is obviously harmful. This harmful effect become dangerous when excessive transpiration leads to the wilting of the plants. To reduce the loss of river, several practices are commonly employed by the farmers and the gardeners. One of them is to remove the weeds from the vicinity of the crop plants. These weeds transpire abundantly of water and also utilize soil minerals, thus depleting the soil of its two important constituents, the water and the mineral salt.

If it is not done, the crop plants would only be stunted. To minimize the transpiration during the summer months, the green houses are whitewashed to cut down the light intensity and the temperature. Interior of the green houses is sprayed next to water to saturate the atmosphere with humidity and thus diminution the transpiration. In propagation of plants by cutting or in trans-plantation of seedlings, some of the leaves are removed to muffle the transpiration and thus avoid wilting. Besides wilting, other harmful effects of excessive transpiration include inhibition of protein synthesis and breakdown of proteins and retardation of metabolic processes like photosynthesis. This is the reason why Transpiration is regularly called as necessary evil.

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