Which one of the following statements is wrong?

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Seaweeds contain carrageenan and alginate. Because of their water-holding properties, carrageenan and alginate are extracted from seaweeds and used to thicken a variety of foods, including soy milk, chocolate milk, etc. Agar or agar-agar, is a jelly-like substance, obtained from red algae Gelidium and Gracilaria . Agar can be used as a laxative, an appetite suppressant, a vegetarian substitute for gelatin, a thickener for soups, etc. Chlorella and Spirulina are forms of alga and highly rich in nutrients. They are u