How trichomes prevent water loss and what are its secretions?

Dear Student.
Please find below the solution to the asked query.

Trichomes prevents water loss by the following way:

1. Trichomes can reduce the rate of transpiration, by blocking movement of air on the surface of leaf.
2. Trichomes can trap moisture, thus maintaining a humid environment. 
3. Trichomes can increase the surface of water absorbing area of root.

Trichomes can secrete essential oils, resins, mucilage, gums etc.

Hope this information will clear your doubts about the topic.
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