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Correct question :
14. Which is lack of nucleus?
(a) Neuron
(b) Sieve cell
(c) Gland cell
(d) Pollen cell
ANSWER :
(b) Sieve cell
Reason :
(a) Neuron , is a basic unit of nervous system . It is involved in signal transmission. It contains nucleus.
(b) Sieve cell, is a part of conducting tissue ( phloem ). As it is involved in carring product of photosynthesis , they lack organelles like nucleus so to provide maximum space.
(c) Gland cell , part of gland . Involved in release of secretion from glands. Thus they require nucleus to process the incoming signals.
(d) Pollen cell is also a nucleated cell.
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