Q1 of 33 Page 18

The diagram below represents a stage during cell division. Study the same and then answer the questions that follow:


(a) Name the parts labelled 1, 2 and 3.


(b) Identify the above stage and give a reason to support your answer.


(c) Mention where in the body this type of cell division occurs.


(d) Name the stage prior to this stage and draw a diagram to represent the same.

(a) The part 1 – Centriole;

The part 2 – Spindle fibres;


The part 3- Chromatid


(b) The stage shown in the above diagram is late anaphase of mitosis in an animal cell because-


(i) Two chromatids of a chromosome are reaching to the opposite poles of the cell.


(ii) The appearance of the furrow in the cell membrane.


(c) This is a mitotic division which is found in all type of somatic (body) cells except reproductive cells.


(d) The stage prior to the anaphase is metaphase.



More from this chapter

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3

"Gametes must be produced by meiosis for sexual reproduction". Why is it so?

 4

Mention whether the following statements are true (T) or false (F). Give reason in support of your answer.

(a) As you grow from childhood to adulthood, your skin cells divide only to replace such cells that are lost from the surface. (T/F)


(b) The unfertilized human egg has half the number of chromosomes of the body cells. (T/F)


(c) The nuclear membrane in a mitotically dividing cell remains intact up to the metaphase and disappears only in the telophase. (T/F)


(d) Mitotic cell division can be a mode of reproduction. (T/F)


(e) Crossing-over between chromatids can occur only between homologous chromosomes. (T/F)

 2

Draw a labelled diagram to show the metaphase stage of mitosis in an animal cell having '6' chromosomes.

 3

The diagram given below represents a certain phenomenon which occurs during meiosis. Name and explain the phenomenon by using the terms - homologous chromosomes, chromatids, crossing-over.