Give reasons to the following:
i) Xylem and phloem.
ii) Aplical Meristematic and Lateral Meristematic.
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Answers
Xylem and phloem are collectively known as vascular bundles. Xylem transport water and minerals from the roots to the entire plant body while phloem has the responsibility to transport the organic food inside the body of the plant.
Apical meristems give rise to the primary plant body and are responsible for the extension of the roots and shoots. Lateral meristems are known as secondary meristems because they are responsible for secondary growth, or increase in stem girth and thickness.
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❶ Xylem tissues are the tubular-shaped structure, with the absence of cross walls. This tissue resembles the shape of a star.
❷ It is located in the centre of the vascular bundle.
❸ Xylem fibres are smaller.
❹ They are present in roots, stems and leaves.
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❶ Phloem tissues are tubular-shaped, elongated, structures with the presence of walls with thin sieve tubes.
❷ It is located on the outer side of the vascular bundle.
❸ Phloem fibres are larger.
❹ They are present in stems and leaves, which later transports and grow in roots, fruits and seeds.
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❶ It is an example of primary meristem.
❷ Present at the tips of roots and shoots.
❸ It is responsible for increase in the length of plant organs.
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❶ It is an example of both primary & secondary meristem, but mostly secondary meristem.
❷ It occurs on lateral side of plant organs.
❸ It is responsible for increase the circumference/girth/thickness of plant organs.