Question

explain how does the exchanges of gases occur in plant across the surface of stem, root and leaves

Answer 1

The exchange of gases in roots of a plant takes place by the process of diffusion. During diffusion, oxygen diffuses into the root hairs and passes into the root cells, from where the carbon dioxide moves out into the soil.


In woodyplants gaseous exchange occurs through the small pores in the stems called lenticles.

In leaves respiration takes place by diffusion of oxygen through stomata into the cells of the leaf from where the carbon dioxide is released into the atmosphere.


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Answer 2

Answer:

In all the three plant parts the exchange of gases takes place through diffusion.

However the surface of a young stem will have stomata, while that of an older stem will have lenticels. The stomatal apparatus consists of a pore called the stoma, a pair of guard cells and subsidiary cells surrounding them. The exchange of gases through the stomatal pore is dependent upon the turgidity of the guard cells. Stomata are majorly present on the surface of the leaves apart from the epidermal surface of young stem. Lenticels are open pores. In roots stomatal pores as well as lenticels are absent, exchange of gases occurs through root hairs.