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  1. Which one of the following shows isogamy with non-flagellated gametes?
    1. Sargassum
    2. Ectocarpus
    3. Ulothrix
    4. Spirogyra
Correct Option: D

In Spirogyra, sexual reproduction occurs through conjugation. Gametes are non-flagellated, morphologically similar. But physiologically different (isogamy with physiological anisogamy).



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