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Economical importance of algae

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Economical importance of algae

  1. 1. ECONOMICAL IMPORTANCE OF ALGAE Presented to: Miss Maria Nawaz Presented by: Faiza Afzal Roll no.: 17471507-105
  2. 2. ALGAE • Algae are photoautotrophic that can prepare their own food and they produce oxygen during photosynthesis. • Algae are ubiquitous. Majority of algae are abundant in stagnant waters.
  3. 3. 1. PRIMARY PRODUCERS • Algae are the main oxygen producers in aquatic areas. They are also useful in decreasing water pollution by releasing oxygen. • 10% of total photosynthesis carried out by plants is carried out by the algae.
  4. 4. 2. ALGAE AS FOOD • Algae species are used as food in several countries and in several forms. • Algae species have proteins, vitamins (A, B, C and E), lipids, and minerals.
  5. 5. ALGAE FOOD-PRODUCTS
  6. 6. 3. ALGAE AS SOURCE OF IODINE • The marine algae are rich in iodine and several other important minerals. • By feeding the milk cattle and hens with algae, iodine quantity of the milk and eggs may sufficiently be increased.
  7. 7. 4. AS ANTIBIOTIC AND MEDICINE • Some algae yield antibiotics Chlorellin is obtained from green alga Chlorella, that inhabits the growth of certain bacteria. • Because of high iodine contents, brown algae is used in manufacture of various goiter medicines. • Spirogyra is used for cleaning of optical instruments.
  8. 8. 5. ALGAE IN SEWAGE DISPOSAL • The effective disposal of sewage requires oxygen and this oxygen is brought about by the algal members present in the sewage like Chlamydomonas, Chlorella etc. • The oxygenation by algae also helps to avoid unpleasant odour coming out of sewage bodies.
  9. 9. 6. ALGAE AS FERTILIZER • Due to presence of P, K, Ca, and some trace elements , the sea weeds are used as fertilizers. • Chara is used to overcome calcium deficiency in the fields. • Fucus is used as manure.
  10. 10. 7. ALGAE IN LAND RECLAMATION • Algae act as binding agent. • Algae help in reducing the pH of alkaline soils and increasing the water holding capacity of these soils.
  11. 11. 8. USE OF ALGAE AS DIATOMITE • Diatomite is fossilized remains of diatoms. Diatoms are single-celled aquatic algae which are in the form of petri dish. • It is used in car paint, roof insulation, wall insulation, cosmetics and bath products.
  12. 12. 9. USE OF ALGAE AS AGAR AGAR • It is a jelly like substance obtained from algae. • It is used in desserts and other cooking. It is also used to thicken soups and sauces.
  13. 13. AGAR AGAR • By using agar, microorganisms can be cultured.
  14. 14. 10. ROLE IN NITROGEN FIXATION • Algae plays in important role in nitrogen fixation. • A high rice yield has obtained when the rice field were inoculated by nitrogen fixation.
  15. 15. 11. SOURCE OF MINERALS • Minerals obtained by Kelps are used in glass and soap preparations. • Sea-weeds are rich source of iron, zinc, copper, manganese and boron.
  16. 16. 12. USE AS ALGIN • Algin is obtained from different algae. • It is used in adhesive structure in artificial silk. • It is used in paints and many pharmaceutical products. • It is used in ice creams.
  17. 17. ALGAE AS ALGIN • It is used in processing of natural and synthetic rubbers.
  18. 18. HARMFULASPECTS OF ALGAE
  19. 19. 1. CONTAMINATION OF WATER RESERVOIRS • The algae grows abundantly in water reservoirs meant for domestic purposes. • This affects the filtration process and brings bad taste to water due to decay of dead algal plants. • Such algae include members of cyanophyta and chlorophyta.
  20. 20. 2. WATER BLOOMS • Sometimes algal plants grow abundantly and form quit apparent bodies called water blooms. • These bodies deplete the oxygen contents of the water during night time. • Emit bad smell and secrete certain poisonous substances harmful to aquatic animals.
  21. 21. WATER BLOOM
  22. 22. 3. DEATH TO LIVING ORGANISMS • Algae causes eutrophication in ponds and lakes. It causes death of aquatic animals. • The death of cattles occur by drinking the infected water. • Due to thick layer of algae on surface of water, photosynthesis does not occur.
  23. 23. 4. DISEASES IN HUMAN BEINGS • The contaminated water causes stomach disorder in human beings. • Similarly some algae are responsible for respiratory disorders, skin diseases and other algae causes allergies.
  24. 24. 5. PARASITIC ACTIVITIES • Some algae are parasites on other plants and animals as well. • Most of these belong to the Rhodophyta (red algae).

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