The activity of sieve tube is controlled by nucleus of

Companion cells

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Bast fibres

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Phloem parenchyma

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Xylem vessels.

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Solution

The correct option is A Companion cells
Companion cells are specialized thin-walled parenchymatous cells found to be associated with sieve tubes. They contain dense cytoplasm and prominent nuclei. Nuclei of companion cells control the metabolic activities of sieve tube elements as they are devoid of the nucleus.
So, the correct answer is 'Companion cells.'

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Similar questions

Which one of the following has cytoplasm but no nucleus : (a) xylem vessel
(b) sieve tube
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Question 23
Which of the following do not lose their nucleus at maturity?

(a) Companion cells
(b) Red blood cells
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Q. Question 23
Which of the following does not lose their nucleus at maturity?

(a) Companion cells
(b) Red blood cells
(c) Vessel
(d) Sieve tube cells

Q. Identify the correct pair of statements.
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