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प्रश्न
The diagram below represents a stage during cell division. Study the same and then answer the questions that follow:
- Name the parts labelled 1, 2, and 3.
- Identify the above stage and give a reason to support your answer.
- Mention where in the body this type of cell division occurs.
- Name the stage prior to this stage and draw a diagram to represent the same.
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उत्तर
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- Centrioles
- Spindle fibres
- Chromatids
- Late anaphase is a furrow starting in the cell membrane at the middle of the cell. The stage described in the diagram is the late anaphase of mitosis in an animal cell. It can be identified by the presence of separated chromatids at the cell's two poles. The appearance of the furrow in the cell membrane classifies the stage as the late anaphase.
- Mitosis occurs in somatic cells (e.g., skin, bone marrow), and meiosis occurs in germ cells within reproductive organs (ovaries and testes).
- The stage before anaphase is called the metaphase stage. During the metaphase stage, the chromosomes are aligned at the equatorial region of the cell. The spindles arising from the centrioles get attached to the chromosomes at centromeres. The chromosomes are in the most condensed state in this phase. The below diagram shows the metaphase stage of mitosis:
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संबंधित प्रश्न
Define the following:
Karyokinesis
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.
Choose the correct answer:
Which division takes most time?
Draw a labeled schematic representation of mitosis cell division.
Name the following:
Replacement of dead cells is accomplished by which process.
Name the following:
The kind of division normally seen at the tip of the root and shoot system.
Name the Following
The stage when chromosomes arrange at the equator.
Name the Following
Name the stage during which nuclear membrane and nucleoli reappear.
Name the Following
Nuclear envelope and nucleoli reappear in which stage.
Complete the following sentence with appropriate word :
Colchicine arrests cell division at __________.
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.
Multiple Choice Question:
The nuclear membrane and nucleolus become indistinguishable during
Write the functional activity of the following structure:
Colchicine
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. |
The karyotype (set of chromosomes) shown below is taken from a dividing cell in a certain individual.
(i) Is the individual male or female? Explain your answer.
(ii) How would you expect
(a) a female cell and
(b) sperm cell to differ in chromosome composition?
Explain the following figure.
The phase of karyokinesis which is almost the reverse of prophase is ______.
