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Complex Permanent Tissues

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Question

These are elongated cells with minute pores forming a part of a complex permanent tissue.

A

Phloem parenchyma

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B

Sieve cells

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C

Phloem fibres

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D

Companion cells

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Solution

The correct option is B
Sieve cells

Sieve cell is a part of phloem tissue. They are elongated cells with minute pores. They do not have a nucleus at maturity. They help in the transportation of food prepared in the leaves to other parts of the plant.

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Question 22
The dead element present in the phloem is

(a) companion cells
(b) phloem fibres
(c) phloem parenchyma
(d) sieve tubes

Which of the following is living but non-nucleated ? a) phloem cell b) sieve tube c) companion cell d) phloem parenchyma

Q. Read the following statements:

(i) The sieve tube elements and companion cells are connected by pit fields present between their common longitudinal walls.
(ii) Phloem parenchyma is made of elongated non-tapering cylindrical cells that have a scanty cytoplasm.
(iii) Phloem fibers are made of parenchymatous cells.
(iv) Companion cells help in maintaining the pressure gradient in the sieve tube.
(v) The phloem parenchyma stores food material and other substances like resins, latex, and mucilage.

How many of the given statements are correct?

Q. Consider the following statements
(a) Xylem transports water and minerals
(b) Gymnosperms lack sieve tubes and companion cells in phloem
(c) First formed primary xylem is called metaxylem
(d) Phloem fibres (bast fibres) are made of collenchyma
Of these statements

Q. Assertion :Death of companion cell leads to the death of sieve cells also. Reason: Both companion and sieve are phloem cells.

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