Which of the following statement(s) regarding the companion cell is/are incorrect?
I. These are closely associated with vessels.
II. They help in loading sugar into the phloem.
III. They help in maintaining the pressure gradient in tracheids.

Only I

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Only II

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I and III

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I, II and III

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Solution

The correct option is C I and III
Companion cells are found within the phloem of flowering plants. Each companion cell is usually closely associated with a sieve element and remain connected with sieve cells by plasmodesmata. They assist in loading phloem sieve cells with sugars through active transport—the companion cells aid in controlling the pressure gradient in the sieve tubes.

Xylem consists of tracheids, vessels, xylem parenchyma, and xylem fibers. Tracheids have thick lignified walls and are dead or without protoplasm. Each vessel consists of short and broad lignified dead cells joined end to end, forming a tubular structure. Both tracheids and vessels help in the conduction of water in a plant.

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Q. Which of the following statement(s) regarding the companion cell is/are incorrect?
I. These are closely associated with vessels.
II. They help in loading sugar into the phloem.
III. They help in maintaining the pressure gradient in tracheids.

Q. Read the following statements and select the correct ones.
(i). Phloem parenchyma is absent in most monocots
(ii). Gymnosperms lack tracheids and vessels
(iii). Gymnosperms lack companion cells

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. Plant cells responsible for the transport of water are dead when they are mature enough to act as water transport tissues. These cells include which of the following cell types?
I. Tracheids
II. Vessel elements
III. Sieve tube members
IV. Companion cells

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Which of the following statement(s) regarding the companion cell is/are incorrect? I. These are closely associated with vessels. II. They help in loading sugar into the phloem. III. They help in maintaining the pressure gradient in tracheids.

Which of the following statement(s) regarding the companion cell is/are incorrect?
I. These are closely associated with vessels.
II. They help in loading sugar into the phloem.
III. They help in maintaining the pressure gradient in tracheids.