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Asked by Arathy Nair(student) , on 14/4/11

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Start Now with Video Lessons, Sample Papers, Revision Notes & more for Class-XII-Science - CBSE 

 There could be two reasons :

1)Endomitosis - Endos means inside so in this type of mitotis, the division of nucleus takes place within intact nuclear membrane(without rupturing it) which leads to polyploid nucleus.
2)Multinucleate condition - when the nuclear division is not followed by wall formation (cytokinesis) so the nucleus happens to be binucleate.

Posted by Pragya Singh(student)on 21/5/12

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