Question

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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Answer 1

Answer:

(i) The tissue X is phloem. Phloem is made of living cells and helps in the transport of food from leaves to other parts of the body. (ii) A sieve tube, which forms the phloem, has tiny pores in its end walls and contains only cytoplasm.