Two algae which produce agar-agar are

Nostoc and Anabaena

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Volvox and Vaucheria

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Gracilaria and Gelidium

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Harveyella and Porphyra

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Solution

The correct option is D Gracilaria and Gelidium
The gelling agent in agar is an unbranched polysaccharide obtained from the cell walls of some species of red algae, primarily from the genera Gelidium and Gracilaria. For commercial purposes, it is derived primarily from Gelidium amansii. In chemical terms, agar is a polymer made up of subunits of the sugar galactose. so option C is correct.

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Agar-agar, algin and carrageenin are obtained from which part of marine algae?

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