HORTICULTURE

HORTICULTURE SCIENCE

PLANT BIOLOGY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which of the following is an adaptation of a xerophyte?
A
reduced roots
B
enlarged leaves
C
many stomata
D
thick cuticle
Explanation: 

Detailed explanation-1: -Xerophytic plant of deserts, has a number of adaptation to reduce transpiration for water conservation e.g. stem is covered by thick cuticle and has high succulency while leaves are modified into spines.

Detailed explanation-2: -The xerophytes plants have a thick waxy cuticle on the stem and on the leaves. This waxy cuticle helps to reduce water evaporation. In the xerophytic plants, the sunken stomata are present. These stomata open during the night to prevent water loss.

Detailed explanation-3: -Thick waxy cuticle: The cuticle cuts down water loss in two ways: it acts as a barrier to evaporation and also the shiny surface reflects heat and so lowers temperature. Sunken stomata: Stomata may be sunk in pits in the epidermis; moist air trapped here lengthens the diffusion pathway and reduces evaporation rate.

Detailed explanation-4: -They are specially adapted to stop them from loosingtoo muchwater. Theyhave smallerleaves which are spiny and have no leaves. They also conserve water by having a thick waxy coat over their leaves and stems.

Detailed explanation-5: -Many xerophytic species have thick cuticles. Just like human skin, a plant’s cuticles are the first line of defense for its aerial parts. As mentioned above, the cuticle contains wax for protection against biotic and abiotic factors. The ultrastructure of the cuticles varies in different species.

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