The activity of sieve tubes is remotely controlled by the protoplasm of

Phloem parenchyma

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Companion cells

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Phloem fibres

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Both phloem parenchyma and phloem fibres

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Solution

The correct option is A Companion cells
Companion cells is a living cell with large nucleus. This nucleus also controls the cytoplasm of sieve tube element. Exception – Austrobaileya is angiosperm plant but companion cells are absent. Special type of cells are attached with the sieve cells in gymnosperm and pteridophytes in place of companion cell.
So, the correct answer is 'Companion cells.'

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Similar questions

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

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