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form 4 biology chap6 pt1

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form 4 biology chap6 pt1

  1. 1. Why do we need food? To provide energy To grow To repair worn-out or damaged tissues To maintain general health
  2. 2.  To state the types of nutrition To explain autotrophic nutrition To explain heterotrophic nutrition To classify organisms according to the types of nutrition
  3. 3. NUTRITION Types Diet Humans and Plants Technology Animals ProductionAutotroph Heterotroph Hydroponics and Balanced In balance Aeroponics Processing Holozoic Selective breeding Saprophytism Tissue culture Parasitism Cooking Genetic Absorption engineering and Freezing Photosynthesis Digestion Defaecation assimilation Soil Management Chemosynthesis Canning Biological control Ruminant Pasteurization Rodents Nutrient Photosynthesis Fermentation Humans requirement Mechanism Factors Drying Light Concentration of Macronutrient Micronutrient Temperature intensity Carbon Dioxide
  4. 4. Nutrition : a process by whichorganisms obtain food or nutrients
  5. 5. AUTOTROPHIC NUTRITION A type of nutrition in which organisms synthesise the organic compounds (food) they require from inorganic substances. The organisms  autotrophs (auto = self, troph = nutrition) The energy required for synthesis of food  sunlight (photosynthesis) @ chemical substances (chemosynthesis)
  6. 6. Photosynthesis All green plant Synthesising organiccompounds from CO2 & H2O in the presence of sunlight.
  7. 7. Chemosynthesis Synthesising organic compounds by using energy from the oxidation of inorganic substances such as CO2, hydrogen sulphide, nitrogen or ammonia. Chemoautotroph : sulphur bacteria, Nitrosomonas sp., Nitrobacter sp.
  8. 8. HETEROTROPHIC NUTRITION A type of nutrition in which organisms have to depend an autotrophs or other organisms as a source of energy as they cannot synthesise their own food The organisms  heterotrophs 3 types : holozoic, saprophytism, parasitism
  9. 9. HOLOZOIC NUTRITION Feeding by ingesting complex organic matter  digested  absorbed Animals & insectivorous plants
  10. 10. SAPROPHYTISM NUTRITION Feeding by absorbing their required nutrients from dead organic matter or the organic excretory waste of organisms Called saprophytes (bacteria, fungi – mushrooms, yeasts & Mucor sp.)
  11. 11. PARASITISM NUTRITION Feeding by absorbing their nutrients from living organisms Lives on or in the body of a living organism (host) & obtains its nutrients from the host  parasites Fleas, lice & tapeworm Endoparasites & ectoparasites
  12. 12. EXERCISE 6.1 Give the difference between autotrophs and the heterotrophs. List three types of heterotrophic nutrition.

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