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 ?

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Solution

(a) (i) Phloem
(ii) Sieve tube
(iii) Companion cell

(b) (i) Xylem
(ii) Xylem vessel
(iii) Tracheids

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

(a) (i) Phloem
(ii) Sieve tube
(iii) Companion cell

(b) (i) Xylem
(ii) Xylem vessel
(iii) Tracheids