Biomes — Geography STD 11 Commerce / Arts — Question

1. There is scarcity of rainfall in the desert biomes.
2. Normally plants lose their moisture through their pores which are present on their leaves and stems.
3. Desert plants need to avoid the loss of water through these pores to lock in the minimum levels of moisture that they have.
4. Hence desert plants have leaves which are modified into thorns to control loss of water through transpiration.

Therefore, desert biomes have thorny vegetation.