Question

what are lenticels ?explain its role of respiration in plants

Answer 1

Lenticels are found on the stem or trunk of plants . In short, lenticels are a type of pore. They serve as a site of gas exchange on the plant
Lenticels are also, unfortunately, a site where pathogens such as fungi, bacteria, and viruses can enter the plant. 

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Answer 2

Lenticels are small pores found on old stems of plants.They never close like stomata.
They help in respiration in plants.During respiration gaseous excahnge takes place frem here also....i.e.,intake of O∨2 and releasing of CO∨2 during night.
hope i helped u:)