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How is Mitosis Important? - Biology

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How is mitosis important?
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Solution

Mitosis is important because:
(i) It helps in the growth of tissues, organs and thus the entire organism.
(ii) It helps in the repair of damaged tissues and organs.
(iii) It is the method by which lower organisms reproduce.
(iv) It helps in the maintenance of the hereditary characters by the replication of chromosomes.

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Chapter 1: Cell Division - Exercise 1 [Page 11]

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Frank Biology II [English] Class 7 ICSE
Chapter 1 Cell Division
Exercise 1 | Q 9 | Page 11

RELATED QUESTIONS

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

 

  1. Name the parts labelled 1, 2, and 3.
  2. Identify the above stage and give a reason to support your answer.
  3. Mention where in the body this type of cell division occurs.
  4. Name the stage prior to this stage and draw a diagram to represent the same.

With the help of suitable diagrams, explain the five stages of prophase-I of meiosis.


Write down the phases of mitosis.

Where does mitosis occur?

Give important characters of meiosis.

The diagram given alongside represents a stage in cell division.
Study the same and answer the questions that follow:

(i) Identify the stage of cell division.
(ii) Name the parts labeled A,B,C and D.
(iii) What is the unique feature observed in this stage?
(iv) Where does this type of cell division usually occur?
(v) How many daughter cells are formed from this type of cell division?
(vi) Is the dividing cell shown a plant or an animal cell?
Give a reason to support your answer.


The fig given alongside shows a certain stage in a cell division in a cell  with four chromosomes.

(i) Name the parts of the chromosome labeled A and B.
(ii) Name the structure C. what is its function?
(iii) Name the type of division . Give a reason.
(iv) Name the stage of division.
(v) Name the stages before and after the stage shown in diagram.


Identify the stages of mitosis given below and label the figures.


The diagram below represents a certain stage of a cell.

(i) Is it an animal cell or a plant cell ? Give one reason in support of your answer.
(ii) Label the parts numbered 1 – 3.
(iii) Which stage (phase) of mitosis is represented in this diagram


The figure below shows a certain stage of mitosis:

(i) Name the stage,
(ii) Label the parts 1 to 4
(iii) How many chromosomes are shown here?


Explain the Term Pachytene


Explain the Term Cell Diakinesis


Name the following:

Replacement of dead cells is accomplished by which process.


Give Technical Terms

The stage at which spindle fibres begin to be formed.


Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:

The alkaloid colchicine inhibits the formation of the mitotic spindle.


Column ‘II’ is a list of items related to ideas in Column ‘I’. Match the terms in Column ‘II’ with a suitable idea given in Column ‘I’.

Column I Column II
(i) Anaphase (a) Chromosomes become arranged in a horizontal plane at the equator.
(ii) Prophase (b) Daughter chromosomes move to opposite poles of the spindle.
(iii) Telophase (c) Chromosomes become visible as fine, long threads.
(iv) Metaphase (d) Chromosomes lose their distinctiveness and gradually become transformed into chromatin network.

Explain the following figure.


Name these:

Two steps of the process Mitosis


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