Answer:
(i)
It is the outer protective tissue of older stem and roots.
(ii) It is formed by secondary lateral meristem called cork cambium.
(iii) The mature cork become dead and filled with tannin,
resin and air.
(iv) The cells are arranged compactly without intercellular
spaces.
(v) The cells become several layer thick, which are impermeable
due to deposition of suberin in their wall. (2)
Formation of Cork
As plant grow older, the outer protective tissue undergoes
certain changes. A strip of secondary meristem replaces the epidermis of stem.
Cells on the outside are cut-off from this layer. This form several layer thick
cork or bark of the no overlap. (1)
Role of Cork
(i) It prevents loss of water by evaporation.
(ii) It protects plant from the invasion of parasites and
other harmful microorganisms.
(iiii) It is used for manufacture of insulation boards, sport
goods, shock absorber, etc. (2)
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