by which process does gaseous exchange takes place during external respiration in plants and which part of the leaves carry it out and how?
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The leaves of plants have tiny pores on their surface which are called stomata. The exchange of gases in the leaves during respiration takes place through stomata.
This happens as follows: Oxygen from the air enters into a leaf through stomata and reaches all the cells by the process of diffusion. This oxygen is used in respiration in cells of the leaf. The carbon dioxide produced during diffuses out from the leaf into the air through same stomata.
The photosynthesis reaction makes glucose and the respiration reaction break it down. In photosynthesis, the energy which goes into the reaction is light energy....
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External gaseous exchange takes place by the process of Diffusion.
Stomata in the leaves carries out this process by opening and closing the guard cell present in it.