Question

Describe the process of respiration in following parts of a planr-

1)root

2)stem

3)leaves

Answer 1

Respiration through leaves:

The leaves of plants have tiny pores called stomata which help in gaseous exchange by simple diffusion process. The rate of respiration in plants is much slower than animals as the energy requirement of the animals is low. During day time when photosynthesis is also going on in the leaves, oxygen for respiration is obtained by photosynthesis itself while excess oxygen is given out. During night time, when there is no photosynthesis stomata take in oxygen and give out carbon dioxide as all organisms. Once oxygen is inside the cells of the leaves glucose is oxidised to release energy in the form of ATP molecules and is used for various metabolic activities.​
Through stems:

Lenticels are the lens-shaped small pores on the surface of the stems of woody plants. Lenticels consist of thin walled loosely arranged cells with intercellular spaces. In stem they hepls in gaseous exchange.​

Through roots:

Roots of plant respire by taking air trapped within the soil. ​

Once exchange of gases is done, then the process of respiration in same in every part of plants.

Hope this information will clear your doubts about the topic.