Q. 95

The transport system in plants consists of two kinds of tissues X and Y. The tissue X is made up of living cells and consists of two components A and B. The component A has tiny pores in its end walls and contains only cytoplasm but no nucleus. On the other hand, component B has cytoplasm as well as nucleus. The tissue Y is made up of dead cells and consists of two components C and D. The component C has open ends whereas component D does not have open ends. In flowering plants, either only C or both C and D transport water but D is the only water conducting tissue in non-flowering plants.

(a) What is (i) tissue X (ii) component A, and (iii) component B ?

(b) What is (i) tissue Y (ii) component C, and (iii) component D ?

Answer :

(a) (i) Phloem (X)

(ii) Sieve tube (A) (iii) Companion cell (B)


(b) (i) Xylem (Y) (ii) Xylem Vessel (C) (iii)Tracheids (D)


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