KCET 2017 Biology Solved Paper

There are many modifications to leaves that reduce transpiration, or water loss through leaves, especially on plants in arid regions. These include:
→ Plants with a thick waxy layer will cut down on water loss through the leaves, such as on Aloe.
→ A thick covering of hairs (pubescence) like a fur coat, as on Asclepias (Milkweed) or Verbascum (Mullein)
→ The leaf blade is curled in on itself so that the stomata are on the inside. This creates a humid micro-climate which slows down water loss. Marram grass, which grows on sand dunes, is a good example.