ICSE 2009 Solved Important Papers of Biology By Mr. M. P. Keshari

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Biology - Cell Division and Structure of Chromosomes (Solved)

Question .1. Name the following :

(i) The two kinds of cell division found in living organisms.

(ii) The kind of cell division normally seen at the tip of root and shoot system.

(iii) The point at which the duplicated chromosomes are joined.

(iv) The largest phase of a normal cell cycle.

(v) The points where crossing over occurs.

(vi) The stage when chromosomes arrange at the equator.

(vii) The kind of division takes place in the reproductive tissues.

(viii) Acts as a bearer of heredity units.

(ix) A region of plant body where cell division occurs very actively.

(x) The type of cell division that occurs during :

(a) Growth of shoot. (b) Formation of pollen grains. (c) Repair of worn out tissues.

(xi) Two animals which have nineteen pairs of chromosomes.

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Question . 2. Match the column A with column B.

 
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Question .3. State true or false :

(i) Cytokinesis is a division of cytoplasm.

(ii) Four daughter cells are formed as a result of meiosis.

(iii) During telophase the nuclear membrane disappears.

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Question .4. Write the terms in correct order so as to be in logical sequence:

Metaphase, telophase, prophase, anaphase.

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Question .5. Choose the correct answer :

Duplicated chromosomes are joined at a point termed (centrosomes, centromere,centriole, chromatid).

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Question.6. How many daughter cells are formed at the end of mitosis and at the end of meiosis?

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Question.7. With reference to cell division explain the following terms :

Chromatids, Centromere, Haploid.

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Question .8. Given below is a diagram representing a stage during mitotic cell division in an animal cell :

Fig. page – 12/ TW

(i) Identify the above stage. Give a reason to support your answer.

(ii) Name the cell organelle that forms the ‘aster’.

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

(iv) Name the stage that follows this stage of mitosis. How can this stage be identified ?

(v) Mention two points of difference between ‘mitosis’ and ‘meiosis’ with regard to :

1. The number of daughter cells formed.

2. The chromosome number in the daughter cells.

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Question.9.  (i) Where does meiosis occurs in our body ?

(ii) Sate the significance of mitosis.

(iii) What is the importance of meiosis ?

(iv) What do you mean by crossing over ? 

(v) What is Karyokinesis ?

(vi) Why mitosis is referred to as reduction division ?  

(vii) What happens during metaphase of mitosis ?

(viii) What is synapsis ?

(ix) State the types of chromosomes according to the position of centromere.

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Question .10. Draw a neat labelled diagram to show the metaphase stage of mitosis in an animal cell having chromosomes.

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