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प्रश्न
Explain the significance of mitosis.
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उत्तर १
(i) It helps to maintain linear heredity of an organism by keeping the chromosome number constant in daughter cells.
(ii) It helps in the development of an organism from zygotic stage to adult stage.
(iii) It is the means of repair and regeneration of cells.
(iv) Asexual reproduction is accomplished only through mitosis.
(v) Details of mitosis are similar in all organisms which emphasizes the unity of life.
उत्तर २
- As mitosis is equational division, the chromosome number is maintained constant.
- It ensures equal distribution of the nuclear and the cytoplasmic content between the daughter cells, both quantitatively and qualitatively. Therefore, the process of mitosis also maintains the nucleo-cytoplasmic ratio.
- The DNA is also equally distributed.
- It helps in the growth and development of organisms.
- Old and worn-out cells are replaced through mitosis.
- It helps in the asexual reproduction of organisms and vegetative propagation in plants.
संबंधित प्रश्न
The exchange of chromatid parts between the maternal and the paternal chromatids of a pair of homologous chromosomes during meiosis.
Given below are three diagrammatic sketches (A, B and C) of one and the same particular phase during mitotic type of cell division.
- Identify the phase.
- What is the diploid number of chromosomes shown in them?
- Identify whether these are animal cells or plant cells? Give reasons.
- Which of these is/are shown in the correct direction?
- Only A
- Only B
- Only A and C
- All the three
Given below is a diagram representing a stage during the mitotic cell division. Study thediagram and answer the following questions:
Identify the stage by giving a suitable reason.
Given below is a diagram representing a stage during the mitotic cell division. Study thediagram and answer the following questions:
Draw a neat, labelled diagram of the stage which follows the one shown in the diagram.
Given below is a diagram representing a stage during the mitotic cell division. Study [5] thediagram and answer the following questions:
Name of the nitrogenous bases.
Choose the correct answer:
Somatic cells divide by
Choose the correct answer:
During mitosis which of the following disintegrate _________
Choose the correct answer:
Chromosomes appear at equator in _____________
Given below is a diagram representing a stage during mitotic cell division. Study it carefully and answer the questions that follow.
Identify the stage shown.
Given below is a diagram representing a stage during mitotic cell division. Study it carefully and answer the question that follow.
How will you differentiate between mitosis and meiosis on the basis of the chromosome number in the daughter cells?
Given below is a diagram representing a stage during mitotic cell division. Study it carefully and answer the question that follow.
Draw a duplicated chromosome and label its parts.
What is cytokinesis?
Give Reasons for the following
The mitosis is called equational division.
Give Technical Terms
The shortest phase of mitosis.
Give Technical Terms
The division which brings about vegetative growth.
Complete the following sentence with appropriate word :
The type of cell division that occurs in the apical meristem of plants is ______.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Somatic cells of a multicellular organism arise from a single cell by mitosis.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Asexual reproduction is accomplished through mitosis.
Why should gametes be produced by meiosis during sexual reproduction?
The main significance of mitosis is that
The growth of multicellular organisms is due to
Both unicellular and multicellular organisms undergo mitosis. What are the differences, if any, observed in the process between the two?
The basis of genetic variation in the living organisms during mitosis occurs due to ______.
