Question

stomata are not necessary for diffusion of what

Answer 1

stomata are not necessary for the diffusion of water vapour as ;                     The definition of Osmosis is "the diffusion of water molecules from a region with high water potential to a region with low water potential, through a partially permeable membrane"

As stomata are pores, they do not have any membranes that can be crossed.

Answer 2

Stomata are not necessary for diffusion of waste produced by the plants.

Explanation:

Stoma is a tiny pore like structure which is seen on the upper surface of leafs. It is involved in photosynthesis as it helps in entry of oxygen from the environment and exit of carbon dioxide from the plant to the environment. They are not involved in diffusion of waste material produced by plants through various activities.