A) Gigartina
B) Gelidium
C) Gracillaria
D) All the above
Correct Answer: D
Solution :
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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