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 containg 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 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) compoment C, and (iii) component D ?

Answer

(a) (i) Phleom (ii) Sieve tube (iii) Companion cell (b) (i) Xylem (ii) Xylem vessel (iii) Tracheids