write the characteristic features and economic importance of chlorophyceae , phaeophyceae and rhodophyceae
Answers
Chlorophyceae: this group of algae belong to the class of Chlorpohyta. It is commonly known as green algae because of its green nature. Chlorophyll a, chlorophyll b and beta carotene are the pigments present in green algae. It stores food as oil droplets. Examples are: spirogyra and volvos.
Economic importance
1. Green algae fix carbon dioxide
2. It is used as food supplements due to its protein rich nature.
Phaeophyceae: it is also known as brown algae, mostly present in marine environments. They are multicellular eukaryotic algae. A pigment called fucoxanthin is responsible for the green - brown color of the algae. Examples Sargassim and latissima
Economic importance
1. Fixation of carbon dioxide
2. It contains alginic acid which is extracted for industrial purposes - used as thickening agent in food and as a component of battery anode.
Rhodophyceae: known as red algae. Phycoerythin is the pigment that gives the red color. Found mostly in fresh water. It has eukaryotic cells that lack flagellation and centrioles, it also has double cell walls. It also stores sugar as floridean starch which is similar to glycogen and amylopectin in structure. Examples: dulse and laver.
Economic importance
1. Red algae are consumed as food crops examples are dulse, gum, nori and laver.
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