The transport system in plants consists of two kinds of tissues X, 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 ?
(a) (i) The tissue X is Phloem.
Explanation: As tissue X is a conducting tissue made up of living cells. Hence, tissue X is Phloem.
(ii) Component A is a Sieve tube
Explanation: As component A has tiny pores in its end walls and contains only cytoplasm but no nucleus. Hence, component A is a Sieve tube.
(iii) Component B is a Companion cell.
Explanation: As component B has a cytoplasm as well as the nucleus. Hence, component B is a Companion cell.
(b) (i) The tissue Y is Xylem.
Explanation: As tissue Y is a conducting tissue made up of dead cells. Hence, tissue Y is Xylem.
(ii) Component C is the Xylem vessel.
Explanation: As component C is open on both ends, therefore it is xylem vessels
(iii) Component D is Tracheids.
Explanation: As component D does not have open ends and is present in non-flowering plants as conducting tissue, therefore it is Tracheids.
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