Botany - Plant Kingdom Question with Solution | TestHub

Porphyra, Laminaria andSargassumare among the 70 species of marine algae used as food. Certain marine brown and red algae produce large amounts of hydrocolloids (water-holding substances), e.g., algin (brown algae) and carrageen (red algae) which are used commercially. Agar, one of the commercial products obtained fromGelidium andGracilariaare used to grow microbes and in preparations of ice-creams and jellies.Chlorellaa unicellular alga rich in proteins is used as food supplement even by space travellers.