Chapter 9, Problem 3STP

Summary Introduction

Introduction :

The diagram shows the process of cell division and the structure shown in the diagram is the spindle fibre. Spindle fibres are filaments which are formed during cell division. They are made up of microtubules and are formed at opposite poles of the cell. Spindle fibres attach chromosomes during cell division.

Answer to Problem 3STP

Correct answer :

The correct answer is option (D) spindle.

Explanation of Solution

Explanation/justification for the correct answer :

Option (D) spindle. Spindle fibres are filaments which are formed during cell division. They are made up of microtubules and are formed at opposite poles of the cell. Spindle fibres attach chromosomes during metaphase. Thus, the correct answer is an option (D).

The explanation for the incorrect answer :

Option (A) centromere. It the region of a chromosome to which the spindle attach during cell division. Thus, this is an incorrect option.

Option (B) chromosome. Chromosomes are thread-like structures located in the cell nucleus. Each chromosome has a centromere, which divides the chromosome into two arms. Thus, this is an incorrect answer.

Option (C) nucleolus. The nucleolus is a small dense spherical structure located in the cell nucleus during interphase. Thus, this is an incorrect answer.