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Describe modes of reproduction in Amoeba with the help of diagrams.

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Reproduction :
Amoeba primarily exhibit asexual reproduction. It exhibits following methods of reproduction.

Binary fission :
It is the most common method of reproduction that takes place during favorable conditions. In this method Amoeba divides by cryptomitosis (a type of mitosis) to form two equal size daughter amoebae. The binary fission takes about 30 minutes and it reoccurs at every 24 hours.

Before binary fission, Amoeba withdraws all pseudopodia and stops feeding. The contractile vacuole stops functioning temporarily. One daughter amoeba receives old CV and second daughter amoeba develops new CV.

Multiple fussion :

It is not a method of reproduction. It takes place during unfavorable conditions. The amoeba during unfavorable conditions develops a cyst wall which is three-layers. Inside the cyst, it repeatedly divide by mitosis to form 500 to 600 daughter nuclei. They get surrounded by little cytoplasm and develops a cell membrane. These structures are called as amoebullae. During favorable conditions, the cyst absorbs water, swells and bursts to release amoebulae. Each amoebula forms one young amoeba.

Sporulation :

According to Taylor (Scientist), Amoeba exhibits sporulation during unfavorable conditions. In this method, the nuclear membrane bursts to release chromatin granules in the cytoplasm. These chromatin granules form 200 to 300 groups of 2 to 3 granules. This condition is called as polyenergid nucleus. Every group get arranged with little cytoplasm and develops a cell membrane and later spore sheath. The resulting structure are called as pseudopodiospores. Finally, the parent amoeba degenerates to release pseudo-podiospores. During favorable conditions, every pseudopodiospore forms a young amoeba.

Regeneration :

It is not a method of reproduction. Amoeba has extreme power of regeneration. A small part of amoeba, if it contains a piece of nucleus, can regenerate to form complete amoeba.

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