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Describe the Different Methods of Asexual Reproduction. Give Examples. - CBSE Class 7 - Science

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Describe the different methods of asexual reproduction. Give examples.

Solution 1

The various modes of asexual reproduction in plants are as follows:

1) Vegetative propagation: It is the ability of a plant to produce new plants from roots, stems, leaves, and buds. Vegetative propagation is divided into two types.

Natural vegetative propagation: This type of vegetative propagation occurs easily in nature and involves simple vegetative parts. Potato plant sprouting from an eye is a common example.

Artificial vegetative propagation: This type of vegetative propagation is performed manually and generally occurs in laboratory conditions. The formation of a complete plant from a stem cutting of rose is a common example of this method.

2) Budding: It involves the formation of a new individual from a bulb-like projection called a budThe bud grows and gets detached from the parent to form a new individual. It is commonly observed in yeast.

3) Fragmentation: :It is a form of asexual reproduction where a new organism is formed from the fragments of the parent body. It is the only mode of asexual reproduction in Spirogyra.

4) Spore formation : Many non-flowering plants reproduce through spore formation. Spores are tiny cells protected by a thick wall. Fungi such as bread moulds reproduce asexually using this method.

Solution 2

Different methods of asexual reproduction are:

1) Binary Fission: This process takes place in unicellular organisms. Parent cell elongates and gets divided into two identical daughter cells. Each daughter cell grows into an independent adult.

2) Endospore Formation: In this method the spore wall is formed around a bacterial cell to form an endospore. This endospore germinates to form an active bacterium under favourable conditions.

3) Fragmentation: In this process, body of the organism breaks up into two parts. Then each part grows into a new filament thus forming two organisms from a single one.

4) Spore Formation: The spores are tiny spherical unicellular structures protected by thick wall. The spores are stored in a hard outer covering and this is called sporangium. 

Under favourable conditions the hard cover breaks and spores spread for germination.

5) Budding: In yeast, new organisms are produced by the bud formation from the parent organism. After growing to full size, the bud gets detached and forms a new independent individual.

6) Vegetative propagation: When vegetative parts of a plant like stems, leaves and root etc., give rise to new ones, it is.called vegetative propagation.

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 NCERT Solution for Science Textbook for Class 7 (2018 to Current)
Chapter 12: Reproduction in Plants
Q: 2 | Page no. 141
Solution Describe the Different Methods of Asexual Reproduction. Give Examples. Concept: Modes of Reproduction.
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