Rate of cuticular transpiration is ------------------ to the thickness of cuticle.

Step-by-step solution

Cuticular transpiration is the loss of water in the form of water vapour through the cuticle, which is a waxy layer present on the epidermis of leaves and stems. The primary function of the cuticle is to prevent excessive water loss from the plant surface. A thicker cuticle provides a greater barrier to the diffusion of water vapour. Therefore, as the thickness of the cuticle increases, the rate of water loss decreases. This means the rate of cuticular transpiration is inversely proportional to the thickness of the