GK
BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Why do you feel cool under a tree but not so under a tin shed on a sunny day?
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The greenness of the tree gives the coal feeling
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Photosynthesis absorbs heat
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The leaves convert water vapour into water which is a heat absorbing process
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The leaves gives out water which vaporises absorbing some heat as latent heat
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Explanation:
Detailed explanation-1: -Transpiration is loss of water through small tiny pores of leaves called stomata. When this water comes on the surface of leaf the water evaporates thereby causing cooling effect. Therefore we feel pleasant sitting under the tree on a hot sunny day.
Detailed explanation-2: -Trees and vegetation lower surface and air temperatures by providing shade and through evapotranspiration. Shaded surfaces, for example, may be 20–45°F (11–25°C) cooler than the peak temperatures of unshaded materials.
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