Mitosis Cell Division
Mitosis is divided into interphase, prophase, metaphase, and telophase. Mitosis cell division helps in asexual reproduction, growth, healing wounds and genetic stability. This note has description on how mitosis division occurs in living cell. It has detail information of different stages of mitosis.
Summary
Mitosis is divided into interphase, prophase, metaphase, and telophase. Mitosis cell division helps in asexual reproduction, growth, healing wounds and genetic stability. This note has description on how mitosis division occurs in living cell. It has detail information of different stages of mitosis.
Things to Remember
- Mitosis is divided into interphase, prophase, metaphase, and telophase.
- Mitosis cell division helps in asexual reproduction, growth, healing wounds and genetic stability.
- Mitosis cell division occurs only in the somatic cell
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Q1:
Explain the importance of the office to an organisation.
Type: Long Difficulty: Easy
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Answer: <p>The office of an organization is the most important unit. It is regarded as the mainspring of a watch and steering of a car. It is equally important to a government unit, business organization as well as service motive organization. It essential to perform a number of administrative as well as clerical functions in the process of achieving the organizational objectives. There is some importance of the office, they are:</p> <ol><li><strong>Planning and decision-making center:</strong> The office formulates various types of plans and policies regarding production, sales, cost, profit, and loss. It makes different types of the decision like changing the amount of capital, objectives, rules and regulations of the office.</li> <li><strong>Coordinating and communicating center:</strong> The office is important due to its coordination and communication functions. It links the activities of different persons and department and directs them towards the attainment of organizational goals. It passes useful information to the staff and departments inside the organization and to the concerned parties outside the organization as per their requirements.</li> <li><strong>Controlling center:</strong> The office is regarded as the controlling center of the organization. It supervises and evaluates the performance of different staff and departments. It compares the actual performance of different staff and departments with the standard performance and takes corrective action to minimize the variations in future.</li> <li><strong>Public relation center:</strong> The office maintains good public relation for operating its business successfully and increasing the goodwill of the organization. It provides accurate and reliable to all the concerned parties as per their requirements. It provides better services to customers, suppliers, lenders, owners, competitors and government in order to maintain good relation with them.</li> <li><strong>Proof of existence</strong>: The office is the proof of the existence of an organization. It gives the identity of the organization. It gives evidence that the organization is operating its business in the society.</li> <li><strong>Record center:</strong> The office is considered as a storehouse of information. It records important and useful information for future reference. It maintains a systematic record of information and documents in files, books of accounts, computer, etc.</li> <li><strong>Service center:</strong> The office is regarded as a service center of an organization. It provides necessary materials and information to the employees and departments increase the efficiency of employees and department.</li> </ol>
Q2:
What are the importance of office?
Type: Very_short Difficulty: Easy
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Answer: <p>The following are the importance of office: -</p> <ol><li>Planning and decision making center</li> <li>Co-ordinating and communicating center</li> <li>Controlling center</li> <li>Public relation center</li> <li>Proof of existence</li> <li>Record center</li> <li>Service center</li> </ol>
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Mitosis Cell Division
Points to remember:
- Spindle fibre: The proteneous threads, which are produced during metaphase stage of cell division, are called spindle fibre. They help in the movement of the chromosome.
- Chromosome: When two chromatid threads are attached with one another through centromere is called chromosome.
- Centromere: The point where two chromatin fibres attach with each other is called centromere.
- Chromatid: When we separate the two thread of chromosome then the individual thread is called chromatid.
Process of cell division:
- Interphase:
- It is not the actual stage of cell division but is the resting stage of cell in which it prepares itself for further division.
- All cellular organelles are present and are well flourishing.
- The chromosomes are not seen directly.
- Prophase:
- Centriole divides into two and each one move towards the opposite pole of the cell.
- Chromosomes are thicker and shorter and can be seen clearly.
- In late prophase except centriole, chromosome and cell membrane, other parts disappear.
- Metaphase:
- Centrioles are at the opposite poles of the cell.
- Chromosomes are arranged in the equatorial plane of the cell.
- Spindle fiber appears which help the chromosome to lie in equatorial
- Anaphase:
- Chromosome split length wise through centrosome. So sister chromosomes called chromatids are produced.
- Eachchromatidsstart to move towards the opposite poles of the cell by contraction of the spindle fibre and repulsive force between chromatids.
- In thisstavechromosome appears in I, J,U and V shape.
- Telophase:
- The chromatids have already reached to opposite poles of the cell.The nuclear membrane is synthesized enclosing the chromosomes.
- Cellular construction becomes more and deeper and finally divides the cell into two equal halves.
- Cellular organelles reappear.
Cytokinesis: The change that occurs in the cytoplasm (cell membrane) during the process of cell division is called cytokinesis. Anaphase and telophase of cell division lie under cytokinesis.
Karyokinesis: The change that occurs in chromosome during the process of cell division is called karyokinesis. All four stage of cell division i.e. prophase, metaphase, anaphase and telophase fall under karyokinesis.
Importance of mitosis cell division
- Physical growth: Mitosis cell division occurs only in the somatic cell, which helps to increase the number of cells in a body resulting physical growth.
- Asexual reproduction: Minor animals and plants, which reproduce by anasexual method, follow the process of mitosis cell division.
- Regeneration and healing wounds: The wounded part of the body will be repaired by the mitosis cell division. Some animals and plants have the unique ability to gain last body part. This is possible because of mitosis.
- Genetic stability: The daughter cells produces at the end of the mitosis are similar to their mother in all respect. Therefore, it helps to keep genetic stability.
Lesson
Cell Division
Subject
Science
Grade
Grade 10
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