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Grade: 12
        
nucleus is absent in..............and why?
(a)sieve tube
(b) companion cell
(c ) collenchyma
(d)mesophyll
one year ago

Answers : (3)

Mufeed fannan
18 Points
							Sieve tube,nuclei is fragmented and disappeared.these are cells which lost their nucleus ribosomes at maturity
						
one year ago
Simran Vinaik
askIITians Faculty
1093 Points
							Sieve tube loses its nucleus at maturity becauseits mainfunction is to transport sugars and other important molecules necessary for plants. It would thus require a lot of space to manage the transport. It is still alive due to companion cell. They are formed from the same mother cells as sieve tubes and these supply the sieve tubes with ATP and other energy rich molecules require for survival.
						
one year ago
Sitanshu kumar Singh
53 Points
							Your answer will be sieve tube but nucleus is present in sieve tube but it degenerates at maturity as it requires enough space for transport of sugars and other substances.Its all functions is controlled by companion cells and hence it`s name
						
one year ago
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