The correct option is B absorb water
∙ Desert plants grow in water scarce areas, their roots are long and go deep into the soil for absorbing water.
∙ The leaves in desert plants are reduced to spines which reduces surface area and minimise water loss by transpiration.
∙ Since their leaves are reduced to spines, their stem is green and performs photosynthesis.
∙ They have fleshy stem with a thick waxy coat to retain water.