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प्रश्न
Differentiate between Centrosome and centromere.
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उत्तर
| Centrosome | Centromere |
| It is an organelle of the animal cell. | It is a non-stainable part of the chromosome at which two chromatids join. |
| It contains two centrioles, which move towards the opposite poles and form spindle fibres during cell division | It provides attachment of spindle fibres during cell division. |
| They are responsible for the inheritance of characters from parents to off-spring. Chromosomes also help in cell division and control various metabolic activities. | It is the region of attachment of the sister chromatids and also the site of attachment to the spindle fibre. |
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संबंधित प्रश्न
The diagram given below represents a stage during cell division.
Study the same and answer the questions that follow:
- Identify whether it is a plant cell or an animal cell. Give a reason in support of your answer.
- Name the stage depicted in the diagram. What is the unique feature observed in this stage?
- Name the type of cell division that occurs during:
- Replacement of old leaves by new ones
- Formation of gametes
- What is the stage that comes before the stage shown in the diagram?
- Draw a neat, labelled diagram of the stage mentioned in (iv) above keeping the chromosome number constant.
Given below is a diagram representing a stage during mitotic cell division in an animal cell Examine it carefully and answer the questions which follow.
- Identify the stage. Give one reason in support of your answer.
- Name the cell organelle that forms the ‘aster’.
- Name the parts labelled 1, 2 and 3.
- Name the stage that follows the one shown above; how is that stage identified?
- Mention two differences between mitosis and meiosis with regards to:
- The number of daughter cells produced.
- The chromosome number in the daughter cells.
Fill in the blank:
______ is the indirect cell division.
Choose the correct answer:
Which division takes most time?
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
Draw a well-labelled diagram to show the anaphase stage of mitosis in plant cells having four chromosomes.
Explain the Term Pachytene
Name the Following
Nuclear envelope and nucleoli reappear in which stage.
Choose the Odd One Out
Write the functional activity of the following structure:
Colchicine
In which stage of mitosis the chromosomes align in an equatorial plate? How?
Give the sequence of the events occurring during the prophase of mitosis.
The diagram given below represents a stage in mitosis.
- Identify the stage given above.
- Give one reason to support your answer in (a).
- Mention the number of chromosomes given in the diagram.
Name these:
Two steps of the process Mitosis
