(a) State the constituents of phloem. (b) How does cork act as a protective tissue ?

Ans. (a) Constituents of phloem are:

(i) Sieve tubes

(ii) Companion cells

(iii) Phloem fibres

(iv) Phloem parenchyma

(b) Cells of cork are dead and compactly arranged without intercellular space and hence do not allow entry of pathogens. Moreover, they have a chemical called suberin in their walls that makes them impervious to gases and water.

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