Question

Alginic acid is obtained from

• A. Red algae
• B. Green algae
• C. Diatoms
• D. Brown algae

Answer 1

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