Spirogyral lateral conjugation takes place in :

Heterosporous species

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Homosporous species

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Heterothallic species

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Homothallic species

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Solution

The correct option is A Homothallic species
Conjugation in Spirogyra is of two kinds: Scalariform and Lateral conjugation. (I) Scalariform conjugation: It is the most normal strategy in most heterothallic types of Spirogyra. It happens in the night when two fibers approach and lie inverse and parallel to one another. In homogametic species, lateral conjugation takes place.
So, the correct option is Homothallic species'.

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