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प्रश्न
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उत्तर
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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संबंधित प्रश्न
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.
Genetic recombination occurs in ______ phase of prophase of meiosis-I.
Describe anaphase in mitosis.
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.
Identify the stages of mitosis given below and label the figures.
Draw a labeled schematic representation of mitosis cell division.
Explain the Term Pachytene
Name the following:
Mitosis takes place in which cells.
Name the Following
The stage when chromosomes arrange at the equator.
Name the Following
Name the stage during which nuclear membrane and nucleoli reappear.
Give Technical Terms
The stage in mitosis when the nucleolus starts disappearing.
Give Technical Terms
The stage at which spindle fibres begin to be formed.
Give Technical Terms
Division of nucleus.
Choose the Odd One Out
Multiple Choice Question:
Karyokinesis is the division of
Multiple Choice Question:
The nuclear membrane disappears in
Write the functional activity of the following structure:
Colchicine
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.
Match List - I with List - II.
| List - I | List - II |
| A. Centromere | I. Mitochondrion |
| B. Cilium | II. Cell division |
| C. Cristae | III. Сell movement |
| D. Cell membrane | IV. Phospholipid Bilayer |
Choose the correct answer from the options given below:
