Q.

Lens shaped opening in cork region

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a

perform major function of transpiration.

b

permit gaseous exchange.

c

contains thick lignified living cells.

d

occurs mostly in herbaceous plants.

answer is B.

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Detailed Solution

At certain regions, the phellogen cuts off closely arranged parenchymatous cells on the outer side instead of cork cells. These parenchymatous cells soon rupture the epidermis, forming a lens-shaped openings called lenticels. Lenticels permit the exchange of gases between the outer atmosphere and the internal tissue of the stem.
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