Q.
See the diagram carefully and sequentially arrange the steps of amitosis given below?
I. The constriction appears in the cytoplasm II. The nucleus of cell elongates and develops a constriction round its middle III. The constriction in nucleus gradually deepens and finally cuts the nucleus into two daughter nuclei IV. The cytoplasmic constriction divides the parent cell into two daughter cells, each with a nucleus Option containing correct sequence of events is
A) $I \rightarrow III \rightarrow II \rightarrow IV$
B) $I \rightarrow II \rightarrow III \rightarrow IV$
C) $II \rightarrow I \rightarrow III \rightarrow IV$
D) $II \rightarrow III \rightarrow I \rightarrow IV$
Explanation
Amitosis is known as direct division. In this method, nuclear envelope remains intact. The steps involved in amitosis are as follows (i) The nucleus of the cell elongates and develops a constriction round its middle (ii) The constriction in nucleus gradually deepens and finally cuts the nucleus into two daughter nuclei (iii) The constriction appears in the cytoplasm (iv) The cytoplasmic constriction divides the parent cell into two daughter cells, each with a nucleus
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.