Cacti survive in a desert because:
a. It has a flat green stem to store water and prepare food by photosynthesis.
b. The stem is covered with a thick layer, which helps to preserve water.
c. Its roots are distributed on the surface to absorb water.
d. Leaves are modified into spines to prevent loss of water.
a, b and d are correct
Cactus survives in deserts due to the following adaptations:
It has a flat green stem to store water and prepare food by photosynthesis. The stem is also covered with a thick waxy layer, which helps to retain water. It's roots go very deep into the soil for absorbing water. Leaves turn into spines to prevent loss of water.