Algae. Classification of Algae. Chlorophyceae, Rhodophyceae, Pheophyceae. economical importance of Algae.

Algae, Chlorophyceae(Green Algae), Rhodophyceae(Red Algae), Pheophyceae(Brown Algae). RBG ALGAE, Red Algae, Brown Algae, Green algae.

1. ALGAE

2. Main characteristics of algae Algae are chlorophyll containing ,simple , thalloid (i.e. a plant body is not differentiate into root stems and leaves) and autotropic animal. Algae are largely aquatic , either marine or fresh water. They also occur in habitats like moist stones , soils and wood. Some of them also occur in association with fungi and animals. Algae are of variable size and forms. The size ranges from the microscopic unicellular form like Chlamydomonas , to colonial forms like Volvox . Vascular tissues are absent . Algae reproduce by sexual, asexual , and vegetative methods.

3. Reproduction in algae vegetative reproduction is by fragmentation. During the asexual reproduction different types of spores are formed like zoospores. Sexual reproduction can be : Isogamous Anisogamous Oogamous.

4. Classes of algae On the basis of their pigments algae are classified into 3 major groups: Chlorophyceae Phaeophyceae Rhodophyceae

5. chlorophyceae The common name of chlorophyceae is green algae. The major pigment present is chlorophyll a chlorophyll b. The stored food is starch. The cell wall is made up of cellulose . Green algae is commonly found in fresh water, brackish water and salt water. Some examples- Chlorella, Spirogyra, Chara , Volvox, Ulothrix , Chlamydomonas.

6. phaeophyceae It is commonly known as brown algae. The major pigments are chlorophyll a ,chlorophyll c, and fucoxanthin. The stored food is mannitol and laminarin . The cell wall is made up of cellulose and algin . Found in fresh water , brackish water, salt water. Some examples- Ectocarpus , Sargassum, focus, Alaria , etc.

7. rhodophyceae It is commonly known as red algae . The major pigments are chlorophyll a, chlorophyll d , and phycoerythrin . The food stored is floridean starch . The cell wall is made up of cellulose , pectin , and polysulphate . Commonly found in fresh water , brackish water and salty water. Some examples- Porphyra , Thorea , Gelidum , Champia , Ceeramium , etc .

8. Economic importance Algae help in photosynthesis. It is essential for respiration of aquatic life. Algae are primary producers of energy rich compounds. Certain unicellular algae like chlorella and spirulina are rich in protein and are used as food supplements even by space travelers. Fucus and luminaria are rich sources of iodine. Agar is one of the commercial product obtained from gelidium and gracilaria and are used to grow microbes and in preparations of ice creams and jellies.

9. Thank You

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