Sexual reproduction of Spirogyra is an advanced feature as it shows

Different sizes 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 different sex organs

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Solution

The correct option is D Physiologically different sex organs
The sexual reproduction in Spirogyra takes place by a process of conjugation, in which two filaments or opposite strains (positive and negative) which are lying side by side are joined by conjugation tubes, and then produce zygospore.

The correct answer is D.

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