Desert Ecosystem

All the options are correct. The vegetation of hot desert climate is the xerophytic type which has special characteristics to withstand very high rate of evaporation. - They have long roots, to reach deep water sources. - Thick barks, to reduce water loss. - Waxy leaves, to minimize evaporation. - Presence of thorns and little leaves, to reduce water loss.

Plants in arid environments have evolved adaptive features to minimize water loss through transpiration:  - Hard and waxy leaves have a thick cuticle and fewer stomata, reducing water loss by limiting evaporation. - Tiny leaves have a smaller surface area, which decreases the area exposed to transpiration. - Thorns, though primarily modified branches for protection, can also replace leaves in some desert plants (e.g., cacti), further reducing transpiration by limiting leaf surface area. Therefore, the correct answer is option (d) 1, 2 and 3.