Note on Asexual Reproduction

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Reproduction is one of the important and essential characteristics of living organisms. Organisms reproduce in order to multiply their numbers and to maintain the continuity of their species. The process of production of new individuals by the organisms to continue their generation is the reproduction found in organisms.

There are two different methods by which different organisms reproduce.

  1. Asexual reproduction
  2. Sexual reproduction
 

Asexual reproduction

The reproduction that takes place without the fusion of male and female gametes is called asexual reproduction. In this types of reproduction, similar types of new organisms develop from a single organism. Such reproduction takes place in simple unicellular organisms like amoeba, paramecium, etc. These organisms multiply their number by simple division method from a single parent by a process of fission. Organisms like Yeast, hydra also reproduce asexually.

Types of asexual reproduction:

1. Fission: The type of reproduction in which one individual divide itself into two or more daughter individual by some mechanism is called fission. It is of two types:

 
  • Binary fission: C:\\\\Users\\\\shuva\\\\Desktop\\\\fission.jpg

    The asexual reproduction in which one organism divides into two daughter organisms is called binary fission. This type of reproduction generally occurs in Amoeba, Euglena, Paramecium etc.

 
  • Multiple fission: C:\\\\Users\\\\shuva\\\\Desktop\\\\multiple-fission-amoeba-malarial-parasite.jpeg

    The asexual reproduction in which one organism divides into many daughter organisms is called multiple fission. This type of reproduction generally occurs in Plasmodium (malaria parasite) and Chlamydomonas.

 


2. Budding: C:\\\\Users\\\\shuva\\\\Desktop\\\\28.04.08-shivangi-biology-10.2.8.2.1_SG_SS_html_m4d564d81.png

During budding, a small end produced on the body of the organism grows fully and is detached from the main body part after maturity and starts living on its own, is called budding.

 


3. Fragmentation and regeneration

  • Fragmentation: C:\\\\Users\\\\shuva\\\\Desktop\\\\spirogyra-fragmentation.jpeg

    When a long plant body divides into various fragments because of different effects, they start to spread independent life. This is called fragmentation. E.g. Spirogyra

 
  • Regeneration:

    When an organism is divided into two, each part can regenerate into a new individual this process is called regeneration. It is very common in animals like hydra, tapeworm, Planeria etc.

 


4. Sporulation:

Most of the non-flowering plants like mucor, mushroom, bacteria produce spores inside their sporangia. The spores are small, light unicellular reproductive structures formed by meiosis. The spores are released out by bursting. Such spores germinate under favorable conditions.

 


5. Vegetative propagation: http://i.imgur.com/Sk0lN5Q.jpg

The reproduction, which generally occurs only in plants from various vegetative organs like root, stem, leaves etc. through the process of cutting, grafting, layering etc., is called vegetative propagation. E.g. through root: sweet potato, mint etc., through leaves: poryophylum begania etc., through stem: sugarcane, ginger etc.

 

  • Reproduction is one of the important and essential characteristics of living organisms.
  • Organisms reproduce in order to multiply their numbers and to maintain the continuity of their species.
  •  The process of production of new individuals by the organisms to continue their generation is the reproduction found in organisms.
  • Asexual reproduction: The reproduction that takes place without the fusion of male and female gametes is called asexual reproduction.
.

Very Short Questions

Reproduction is the process by which living organisms produce new individuals.

There are two types of reproduction. They are: sexual reproduction and asexual reproduction.

The reproduction that takes place without the fusion of male and female gametes is called asexual reproduction.

The reproduction that takes place with the fusion of male and female gametes to form zygote is called sexual reproduction.

The process in which male and female gametes fuse together to form zygote is called fertilization.

The reproduction that takes place without the fusion of male and female gametes is called asexual reproduction. Types of asexual reproduction are:

  1. Fission
  2. budding
  3. sporulation and regeneration
  4. vegetative propagation

The type of reproduction in which one individual divide itself into two or more daughter individual by some mechanism is called fission. The types of fission are:

  1. Binary fission
  2. Multiple fission

The asexual reproduction in which one organism divides into two daughter organisms is called binary fission. The asexual reproduction in which one organism divides into many daughter organisms is called multiple fission.

When a long plant body divides into various fragments because of different effects, they start to spread independent life which is called fragmentation.

When an organism is divided into two, each part can regenerate into a new individual this process is called regeneration.It is very common in animals like hydra, tapeworm, Planeria etc.

The reproduction, which generally occurs only in plants from various vegetative organs like root, stem, leaves etc. through the process of cutting, grafting, layering etc., is called vegetative propagation. E.g. through root: sweet potato, mint etc.

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  • Asexual reproduction is defined as ______.

    the reproduction that takes place by cross-pollination


    the reproduction that takes place with the fusion of male and female gametes


    the reproduction that takes place without the fusion of male and female gametes


    the reproduction that takes place by self-pollination


  • The process of production of new individuals by the organisms to continue their generation is called ______.

    circulation


    reproduction


    fertilization


    pollination


  • When the spores in plants mature, they germinate under favorable condition to form a new plant. This process is called ______.

    fertilization


    circulation


    sporulation


    pollination


  • The process in which male and female gametes fuse together to form zygote is called ______.

    sporulation


    circulation


    pollination


    fertilization


  • Those animals which have both male and female reproductive organ are called ______.

    autotrophs


    heterotrophs


    parasites


    hermaphrodites


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DISCUSSIONS ABOUT THIS NOTE

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Forum Time Replies Report

Ask any queries on this note.:why there are two daughter cells in the fission?


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Saugat Parajuli

Vegetative propagation is very important for farmers.Why?


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What is life process

Varieties of activities carried out by living organism which is necessary to maintain and continues life is called life process


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