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Q.

Pick the odd one with respect to the presence of nucleus.         

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a

Epithelial cell

b

Sieve tubes

c

Nerve cell

d

Hepatocyte

answer is B.

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Detailed Solution

  • Sieve tubes do not have nucleus because the nucleus of companion cells controls their functional activities. 
  • The sieve tube cells have no organelles and very little cytoplasm to create more space for solutes to be transported.
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