Question

Refer to the given figures and answer
Read the given statements which represents the features of the figure A,B,C and D
Match them correctly and select the correct option
(i) chromosomes appear like a ball of wool
(ii) Reformation of nuclear envelope, nucleolus, Golgi complex and ER
(iii) Formation of equatorial plate
(iv) Splitting of chromosomes

A) A-(vi), B-(iii) , C-(i), D-(ii)
B) A-(iii), B-(iv), C-(I), D-(ii)
C) A-(ii), B-(iii), C-(i), D-(iv)
D) A-(iv), B-(ii), C-(iii), D-(iv)

Answer 1

Cell division is a process where one cell divides to form two or more identical cells. Based on the type of cell that divides, cell division is off mitosis and meiosis. Mitosis occurs in somatic cells where a parent cell divides to form two identical daughter cells and meiosis occurs in germ cells where a parent cell divides to form four cells with reduced ploidy.

Complete answer:
The cell division has two major phases that are Interphase and Mitotic phase (in case of mitosis) and Meiotic phase (in case of meiosis). Chromatin remains untangled in interphase and is seen as a ball of wool also called a spiremea spireme stage. Cell enters mitosis after it bypass check points. Mitosis is divided into four stages that is:

Prophase: In this phase, the nucleus the nuclear envelope begins to dissociate and the nups migrate within the cell, the chromatin network starts to supercoil and form chromosomes.
Metaphase: Condensed chromosomes tend to assemble at an equatorial plate within the call forming a linear arrangement called metaphase plate. In this stage spindle fibre tends to bind with the outer ring of kinetochore near centromere at either side.
Anaphase: The attachment of kinetochore to spindle fines of mediated by motor proteins called kinesin and dynein which pulls the chromosomes from either side and results in formation of single stranded chromatids and each chromatid is pulled to the polar ends of the cell.
Telophase: reformation of nuclear envelope is seen, relaxation of supercoiled chromosomes to chromatin is seen, reappearance of golgi complex, ER and other organelles is seen gradually, formation of grove is seen resulting in splitting of cell to daughter cells.

Hence, the correct answer is Option ‘A’.

Note: End of mitosis is followed by two other phases which is followed by karyokinesis division of nucleus and cytokinesis division of cytoplasms and its components.