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प्रश्न
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?
उत्तर
(a)
(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. It does not have any nucleus. Hence, component A is a sieve tube.
(iii) Companion cell is a component of phloem and has cytoplasm as well as nucleus. Hence, component B is a companion cell.
(b)
(i) 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.
(ii) Xylem vessel is a component of xylem and has open ends. Hence, component C is xylem.
(iii) Tracheid does not have open ends. Hence, component D is a tracheid.
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संबंधित प्रश्न
Name the conducting tissue of plants which is made of sieve tubes alongwith companion cells.
Name the conducting tissue in plants which is made of living cells
Which process in a plant is accomplished by utilising energy from ATP : transport of water and minerals or transport of food?
What is phloem tissue? Phloem contains two types of cells joined side by side. Name these two types of cells. State whether these cells are living or dead.
Which plant tissue is involved in translocation : xylem or phloem?
In autotrophs, water is transported through:
Water and dissolved minerals get into the root hair of a plant by a process called A and enter the conducting tissue B. The process C helps the water and dissolved minerals to move up through tissue B in roots and stem, and reach the leaves of a plant. In the leaves, food is made by a process D. This food is then transported to all the parts of a plant through tissue E. The process of distributing food made in the leaves to all the parts of the plants is called F.
(a) What are (i) A (ii) B (iii) C (iv) D (v) E, and (vi) F?
(b) Which tissue is made up of living cells: B or E?
(c) Which tissue, B or E, contains sieve tubes?
(d) Which tissue, B or E, contains tracheids?
Explain the mechanism of photosynthesis.
Explain mechanism of sugar transport through phloem.
Chief vascular element concerned with transport of food in plant.
