Question

NCERT Class 7 Chapter 12
Describe the different methods of asexual reproduction. Give examples.
If possible describe in simple method.

Answer 1

Required Answer:

Different methods of asexual reproduction-

• Binary Fission
• Multiple Fission
• Budding
• Fragmentation
• Regeneration
• Vegetative propagation

• Binary Fission - Parent cell splits into two identical cells.

➷Amoeba reproduces by binary fission.

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• Multiple Fission - Parent cell splits into many identical cells.

➷ Plasmodium reproduces by multiple fission.

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• Budding - Small outgrowth from body detaches and matures and becomes new organism.

➷ Hydra reproduces by budding.

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• Fragmentation - Breaking down of body into two or more parts and then matures as new organism.

➷ Spirogyra reproduces by fragmentation.

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• Regeneration - Growing from their fragments.

➷Starfish reproduces by regeneration.

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• Vegetative propagation - New plants are obtained from parts of old plants without the help of any reproductive organ.

➷ Plants like potato can be grown by vegetative propagation.

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Answer 2

Answer: ⤵️

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

(i)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.

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

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

(iv)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.

Explanation: ⤵️

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