Nucleus is absent in

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(A) In mature $Sieve 	ext{ } tubes$, the nucleus is absent to facilitate the efficient transport of food materials through the phloem.Companion cells

Vedclass · Accepted Answer

Sieve tubes

Vedclass · Answer

(A) In mature $Sieve 	ext{ } tubes$, the nucleus is absent to facilitate the efficient transport of food materials through the phloem.Companion cells, however, contain a nucleus and regulate the metabolic activities of the sieve tubes.Chlorenchyma cells are living parenchyma cells containing chloroplasts and possess a nucleus.Therefore, the correct answer is $A$.

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