Question

the difference between xylem and phloem.

Answer 1

Answer:

Xylem Phloem

Xylem tissues are tubular-shaped structure, with the absence of cross walls. This tissue resembles the shape of a star. Phloem tissues are elongated, tubular-shaped structures that include thin sieve tubes with walls.

Xylem occupies the centre of the vascular bundle. Phloem is located on the outer side of the vascular bundle.

Xylem fibres are smaller. Phloem fibres are larger.

They are present in leaves, stems, and roots. They are present in leaves, roots, stems but transports and grow in fruits seeds and roots.

These tissues move in a Unidirectional. (only in one direction – upward direction) These tissues move in a Bidirectional. (both ways – up and down)

Explanation:

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Answer 2

Xylem:

• Had dead long hollow vessels.
• Have lignified cell wall thickening
• Provide cell wall thickening
• Prevent vessels collapsing
• Movement of water is in upward direction from soil to leaves.

Phloem:

• Have living thin tubes placed end to end.
• Ends are connected to each and other by sieve plates.
• Sieve tube is filled with cytoplasm.
• Sieve plates allow cytoplasm to pass.
• Companion cells contain nuclei.
• Control activities of the sieve tubes.
• Can transport substances in the soluble form in all directions to all parts of the plants