Agar-agar is obtained from:

Gigartina

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Gelidium

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Gracillaria

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All of these

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Solution

The correct option is D All of these
Agar–agar is a jelly like substance. It is a non–nitrogenous carbohydrate consisting of two polysaccharides namely agarose and agaropectin. It is obtained from several red algae, e.g., Gracillaria, Gelidium, Gigartinia. It was discovered by Lady Hesse and used by Robert Koch to solidify culture medium.

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