Isogamous condition with non-flagellated gametes is found in

Volvox

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Fucus

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Spirogyra

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Chlamydomonas

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Solution

The correct option is C Spirogyra
Chlamydomonas has flagellated gametes which are similar or dissimilar in size. In Volvox and Fucus, non-motile female gametes and motile male gametes are produced. Spirogyra has gametes that are similar in size (isogamous) and are non-flagellated.

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