Most common phycobiont in a lichen is

Microcytis

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Trebouxia

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Ulothrix

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Spirogyra

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Solution

The correct option is B Trebouxia
The partner in a lichen which enables photosynthesis is called as photobiont and the algal photobionts are called as phycobionts. Trebouxia, a genus of green algae is most common phycobiont and occurs in 40% of all lichens.
Thus, the correct answer is option B.

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