Which of the following structure helps in the respiration of lichens _____________.

Soredia

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Cyphella

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Isoidia

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Cephalodia

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Solution

The correct option is B Cyphella
The cyphellae are small circular depressions and are found irregularly scattered on the underside of some lichens such as Sticta. They have a definite rim made of spherical thin walled cells and open into the medulla of the lichen.
So, the correct answer is 'Cyphella'

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