Question

hi mere pyaare doston.
what are lenticels? Where do they occur? Mention their role.

Answer 1

Lenticels are large sized aerating pores present in the cork tissue for gaseous exchange. They occur in almost all types of phellem containing organs including stem, root, potato tuber etc. They are slightly raised spots on the surface of stem. They help in exchange of gases.
It functions as a pore, providing a pathway for the direct exchange of gases between theinternal tissues and atmosphere through the bark, which is otherwise impermeable to gases. The name lenticel, pronounced with an [s], derives from its lenticular (lens-like) shape.

Answer 2

ANSWER:
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A lenticel is a porous tissue consisting of cells with large intercellular spaces in the periderm of the secondarily thickened organs and the bark of woody stems and roots of dicotyledonous flowering plants.
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It functions as a pore, providing a pathway for the direct exchange of gases between the internal tissues and atmosphere through the bark, which is otherwise impermeable to gases. 
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The shape of lenticels is one of the characteristics used for tree identification. In plant bodies that produce secondary growth, lenticels promote gas exchange of oxygen, carbon dioxide, and water vapor.
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Lenticel formation usually begins beneath stomatal complexes during primary growth preceding the development of the first periderm.
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