Agar-agar commonly used in bacterial cultures and medication is obtained from

Sargasum

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Gelidium

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Ulothrix

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Ulva

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Solution

The correct option is B Gelidium
Agar agar is a gelling agent with unbranched polysaccharide and is used in microbiology as solidifying agent of liquid culture mediums. It is extracted from cell wall of red algae, mostly from Gelidium sp. and Gracilaria sp.
So the correct answer is B.

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