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ALGAE
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.
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.
CLASSES OF ALGAE
• On the basis of their pigments algae are classified into 3
major groups:
 Chlorophyceae
 Phaeophyceae
 Rhodophyceae
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.
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.
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.
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.
THANK YOU
R.A.C.E online ® is a virtual Learning platform for learners of all ages.
Presentations, Video Tutorials and all documents are copyright, do not try to replicate.
For more info about Science & Technology Subscribe to R.A.C.E online.

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Algae. Classification of Algae. Chlorophyceae, Rhodophyceae, Pheophyceae. economical importance of 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.
  • 10. R.A.C.E online ® is a virtual Learning platform for learners of all ages. Presentations, Video Tutorials and all documents are copyright, do not try to replicate. For more info about Science & Technology Subscribe to R.A.C.E online.