Question 23
Which of the following do not lose their nucleus at maturity?

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

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Solution

(a) Companion cells

Red blood cells, vessel, sieve tube cells all lose their nucleus at maturity. Nuclei of companion cells control the metabolic activities of sieve tube elements that are devoid of a nucleus.

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Question 23
Which of the following do not lose their nucleus at maturity?

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

Question 4
Which cell does not have perforated cell wall?

(a) Tracheids
(b) Companion cells
(c) Sieve tubes
(d) Vessels

Which one of the following has cytoplasm but no nucleus : (a) xylem vessel
(b) sieve tube
(c) tracheid
(d) companion cell

Both phloem sieve tube cells and xylem vessel cells are derived from same kind of precursor cells but at maturity they are different. What feature is unique to phloem sieve tube cells?

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

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Question 23 Which of the following do not lose their nucleus at maturity? (a) Companion cells (b) Red blood cells (c) Vessel (d) Sieve tube cells

(a) Companion cells Red blood cells, vessel, sieve tube cells all lose their nucleus at maturity. Nuclei of companion cells control the metabolic activities of sieve tube elements that are devoid of a nucleus.

Question 23
Which of the following do not lose their nucleus at maturity?

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

(a) Companion cells

Red blood cells, vessel, sieve tube cells all lose their nucleus at maturity. Nuclei of companion cells control the metabolic activities of sieve tube elements that are devoid of a nucleus.