Fusion:

1. Fusion is a type of sexual reproduction in algae like Chlamydomonas.

2. Here gametes fuse with one another by their flaglleted anterior end.

3. There are three types of gametic fusion i.e. Isogamy, Anisogamy and Oogamy.

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4. As a result of gametic fusion, the zygote is formed.

Conjugation:

1. Conjugation is also a type of sexual reproduction in algae like Spirogyra.

2. In this method, non- flagellated gamets called aplanogamets are produced. These fuse to form zygospore.

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3. Two methods of conjugation have been found in Spirogyra i.e. lateral conjugation and scalariform conjugation.

4. In conjugation, the male gamete moves in amoeboid manner through the conjugation tube into the female cell of another filament. After fusion of two nuclei, a diploid zygospore is formed.