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Give reasons for the following. (a) Le...

Give reasons for the following.
(a) Leaves of plants appear to wilt in summer afternoons.
(b) When perfume is sprayed on hand, we feel cool.
(c ) Leaves of submerged aquatic plants contain wax coating.
(d) Perspiration is greater in coastal areas than in non coastal areas

Text Solution

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(a) Rate of evaporation (transpiration is maximum in the summer afternoos as temperature is maximum in the afternoon.
(b) Evaporation of perfume taken heat from the body and we get cooling sensation.
( c) due to weak adhesive forces between waxy material and water, the leaves of submerged aquatic plants are protected from decay.
(d) Rate of evaporation is more in non-coastal since humidity is less. Rate of evaporation is less in coastal areas since humidity is more. Thus sweat does not evaporate readily in coastal areas.
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