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NTA Abhyas NEET2020BotanyAnatomy of Flowering PlantsPractice

A mature sieve tube differs from a vessel in

Options

  1. ALacking a functional nucleus
  2. BAbsence of lignified walls
  3. CBeing nearly dead
  4. DLacking cytoplasm

Correct answer

B. Absence of lignified walls

Step-by-step solution

A mature sieve tube lacks lignified walls. Sieve tube in flowering plants has elongated living cells (sieve-tube elements) of the phloem, the nuclei of which are fragmented and disappeared, and the transverse end walls are pierced by sieve-like groups of pores (sieve plates). They are the conduits of food (mostly sugar) transport.

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