Question

explain how does the exchange of gases occur in plants across the surface of stems, roots and leaves

Answer 1

the exchange of gases occurs in plant across the surface of
i) through stems by lenticels
ii) through roots by diffusion
iii) through leaves by stomata

Answer 2

It takes place due to the process of diffusion. It is mostly done with the help of STOMATA or through Lenticles .Plants breathe in through stomata present on them . Just as animals plants respire while photosynthesis to survive as well. They release Carbon Dioxide in presence of sunlight during daytime and Oxygen in the absence of sunlight during night-time.