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Phloem

Match the fol...

Question

Match the following.

A. Sieve tubes 1. Sclerenchymatous

B. Companion cells 2. Perforated end walls

C. Phloem parenchyma 3. Connected to sieve tubes

D. Phloem fibres 4. Dense cytoplasm

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Solution

A. Sieve tubes - Perforated end walls
B. Companion cells - Connected to sieve tubes
C. Phloem parenchyma - Dense cytoplasm
D. Phloem fibres - Sclerenchymatous

Sieve tube is a long tube-like structure with perforation in the end wall.
Companion cells are associated with sieve tubes.
Phloem parenchyma has dense cytoplasm.
Phloem fibres have sclerenchymatous cells.

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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?

Why are perforated walls present in sieve tubes which is a part of phloem?

Q. Which of the following statements are correct?
1. Vessels are the water-conducting tissue found in a gymnosperm.
2. Vessels and sieve tubes both are meant for transport purposes.
3. Phloem fibres are the only living element present in phloem.
4. Lignin make the walls of sclerenchyma cells thick.
5. Parenchyma cells are usually loosely arranged with large intercellular space.

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