Agar-Agar is obtained from

Options

A. Gigartina
B. Gelidium
C. Gracillaria
D. All the above

Answer

D

Explanation

Agar-agar is a jelly like substance. It is a non-nitrogenous carbohydrate cosisting of two polysaccharides namely agarose and agaropectin. It is obtained from several red algae. E.e., Gracillaria. Gellidium, Gigartinia. It was discovered by Lady Hesse and used by Robert Koch to solidify culture medium.