Ulothrix releases zoospore during :

Evening

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Morning

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Night

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Noon

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Solution

The correct option is A Evening
The plant body of Spirogyra is an unbranched filamentous thallus. In the life cycle of S. variants and S. groenlandica, sometimes the gametes fail to fuse. It takes place in the night when two filaments come close and lie opposite.
So, the correct option is 'Night'.

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