Biological termModerate1 mark
2(i)
Name the following:
The openings on the barks of trees through which transpiration occurs.
Topic: Lenticels
Previous-year question practice database
Answer
Exam answer
LENTICELS.
Explanation
Lenticels are small raised pores in the bark of woody stems, filled with loosely packed cells, through which gases and water vapour pass.
THE THREE KINDS OF TRANSPIRATION, and this question is about the least of them: STOMATAL — through the stomata of leaves; about 90% of the total CUTICULAR — through the waxy cuticle; a small amount LENTICULAR — through the lenticels of woody stems; the least of all
Lenticels matter more for RESPIRATION than for transpiration: a thick corky bark is impermeable, so without them the living cells beneath could not exchange oxygen and carbon dioxide with the air.
More from Transpiration
Assertion (A): A thick cuticle reduces transpiration by acting as a barrier.
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