JAMB - Biology (1997 - No. 36)
Adaptive features of plants to desert conditions include?
thick barks, succulent stems and sunken stomata
thin barks, succulent stems and sunken stomata
thin barks, air floats on stems and sunken stomata
air spaces in tissues, adventitious roots and thick barks
Açıklama
The leaves and stems of many desert plants have a thick, waxy covering.
This waxy substance does not cover the stomata, but it covers most of the leaves, keeping the plants cooler and reducing evaporative loss.
Small leaves on desert plants also help reduce moisture loss during transpiration.
Eg cactus plants: · thick, waxy skin to reduce loss of water and to reflect heat · large, fleshy stems to store water · thorns and thin, spiky or glossy leave