In Spirogyra, sometimes the gametes behave directly as zygospores, without fusion. Such reproductive bodies are called as

Azygospores

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Hypnospores

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Zygospores

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Aplanospores

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Solution

The correct option is A Azygospores
At the beginning of conjugation the protoplast of the conjugating cells form gametes, but due to some physiological and atmospheric conditions these gametes fail to fuse and start functioning as the asexually reproducing spores, known as azygospores of parthenospores. Examples: Spirogyra mirabilis, Spirogyra varians, Spirogyra rhizoides.

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Q. The fusion of gametes is called as

Q. In Spirogyra, sexual reproduction involves fusion of ____.

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