Agar, a commercial product extensively used to grow microbes and in the preparation of ice-creams and jellies, is obtained from which of the following pairs of algae?

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Agar is a commercial product obtained from red algae (Rhodophyceae), specifically from the genera Gelidium and Gracilaria . It is extensively used as a solidifying agent in culture media to grow microbes and in the food industry for the preparation of ice-creams and jellies. Laminaria and Sargassum are brown algae that produce algin. Chlorella and Spirulina are unicellular organisms rich in proteins and are used as food supplements. Answer: Gelidium and Gracilaria