Sexual reproduction in Spirogyra is an advanced feature because it shows

Different size of motile sex organs

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Same size of motile sex organs

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Morphologically different sex organs

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Physiologically differentiated sex organs

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Solution

The correct option is C Physiologically differentiated sex organs
Sexual reproduction in Spirogyra is an advanced feature. In Spirogyra, the sexual reproduction involves the fusion of two morphologically similar isogametes and physiologically differentiated sex organs or anisogametes. The male is an active gamete and the female is a passive gamete.
Thus, the correct answer is 'Physiologically differentiated sex organs.'

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