Fleshy layers of an onion are modified stem to store food produced by the leaves.
a. It has a flat green stem to store water and prepare food by photosynthesis. b. The stem is covered with a thick layer of waxy substance, which helps to prevent evaporation of water. c. The roots are distributed on the surface to absorb water. d. Leaves are modified into spines to prevent loss of water.
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 of cuticle, 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