Does sieve cells only occur in phloem of non - flowering plants?

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Solution

Yes. In flowering plants there are sieve tubes and companion cells.

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Programmed cell death (PCD) is a tightly regulated process that is important in the growth and development of plants. In plants there are several tissues which become functional after undergoing PCD. Which of the following cells/tissues represent “functional corpses” arising due to PCD in plants?
(i) Cork cells in bark.
(ii) Sieve elements of phloem.
(iii) Companion cells of phloem.
(iv) Tracheary elements of xylem.
(A) (i) and (ii) only. (B) (ii), (iii) and (iv) only.

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