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

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

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

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

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

  1. 1. ALGAE
  2. 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. 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. 4. CLASSES OF ALGAE • On the basis of their pigments algae are classified into 3 major groups:  Chlorophyceae  Phaeophyceae  Rhodophyceae
  5. 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. 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. 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. 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. 9. THANK YOU
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