Chapter 13, Problem 1STP

Summary Introduction

Introduction :

Cell division is a process in which cell divides to form daughter cells. The cell division process completes in two steps, in the first step nucleus divides and then cytoplasm of the cell divides.

Answer to Problem 1STP

Correct answer :

The correct answer is option (D) cytokinesis.

Explanation of Solution

Explanation/justification for the correct answer :

Option (D) cytokinesis. After Karyokinesis (division of nucleus), the cell begins another process called cytokinesis (division of cytoplasm). The cytokinesis results in two cells. Thus, this is the correct answer.

The explanation for the incorrect answer :

Option (A) chromosomes duplicate. Duplication of chromosomes occur during S-phase of cell cycle. Thus, this is an incorrect option.

Option (B) spindle disintegrates. When chromosomes reach at two poles during late anaphase, disintegration of spindle fibres occurs during telophase. Thus, this is an incorrect answer.

Option (C) nucleus disappears. During prophase, nuclear membrane disappears. This is a part of karyokinesis. Thus, this is an incorrect answer.