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Question

Alginic acid is obtained from

A
Red algae
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B
Green algae
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C
Diatoms
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D
Brown algae
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Solution

The correct option is D Brown algae
Alginic acid is also called as Algin or Alginate. It is an anionic and hydrophilic polysaccharide present in the cell walls of brown algae i.e. Phaeophyceae. It is a linear copolymer made up of residues D-mannuronic acid and L-glucuronic acid. In brown algae, the cell wall consists of cellulose and alginic acid. Cellulosic wall is covered from outside by a gelatinous coating of Algin.
So, the correct answer is D

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