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.
- What is (i) tissue X, (ii) component A and (iii) component B?
- What is (i) tissue Y, (ii) component C and (iii) component D?
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- 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.
- A sieve tube, which forms the phloem, has tiny pores in its end walls and contains only cytoplasm. It does not have any nucleus. Hence, component A is a sieve tube.
- Companion cell is a component of phloem and has cytoplasm as well as nucleus. Hence, component B is a companion cell.
- Tissue Y is xylem. It is made of dead cells and helps in the transport of water and minerals from the soil via roots to the rest of the plant body.
- Xylem vessel is a component of xylem and has open ends. Hence, component C is xylem.
- Tracheid does not have open ends. Hence, component D is a tracheid.
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