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Q.
Which of the following is present in the cell wall of cork that makes it impermeable to water?
NTA AbhyasNTA Abhyas 2020
Solution:
The phellem or cork cells are dead. These are impervious to water due to suberin deposition in the cell wall. Cork prevents the loss of water by evaporation. It also protects the interior against entry of harmful microorganisms, mechanical injury and extremes of temperature. Cork is light, compressible, nonreactive and sufficiently resistant to fire. It is used as stopper for bottles, shock absorption and insulation.