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6570567 61 types-of-nutrition

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6570567 61 types-of-nutrition

  1. 1. 6 NUTRITION6 NUTRITION
  2. 2. What is Nutrition?What is Nutrition? The entire process by which organism obtain energy from food for growth, maintenance and repair of damaged tissues Nutrient – the substances that are required for the nourishment of an organism
  3. 3. 6.1 Type of Nutrition6.1 Type of Nutrition Two main types: 1. Autotrophic 2. Heterotrophic
  4. 4. 1. Autotrophic1. Autotrophic  A process in which organisms synthesise organic substances from inorganic substances  Autotroph = Auto – self, trophos – feed (organism which can make their own food)  The source of energy for synthesising food can be either light energy or chemical energy.
  5. 5. The synthesis of food using light energy – photosynthesis (photo – light) Photoautotroph – organisms which produce organic molecules from carbon dioxide and water using sunlight as a source of energy Example: green plants
  6. 6. The synthesis of food using chemical energy – chemosynthesis (chemo – chemical) Chemoautotroph – organisms which synthesise organic compound by oxidising inorganic compound (hydrogen sulphide and ammonia) Example: certain bacteria (Nitrosomonas sp. and Nitrobacter sp.)
  7. 7. 2. Heterotrophic2. Heterotrophic A type of nutrition in which organism obtain energy through the intake and digestion of organic substances. Heterotroph =Hetero – other, trophos – feed (organism that cannot synthesis their own nutrients but obtain the nutrients from other organisms)
  8. 8. They may practice a) Holozioc nutrition, b) Saprophytism c) Parasitism
  9. 9. - holo –like, zoon – animal - The organism feeds by ingesting solid organic matter which is subsequently digested and absorbed into their bodies - Examples: humans, herbivores, carnivores and some carnivorous pitcher plants and Venus fly-traps a) Holozoic nutritiona) Holozoic nutrition
  10. 10. - The organism called saprophytes - Feed on dead and decaying organic matter - Digest their food externally before absorbing the nutrients into their bodies - Examples: bacteria, fungi b) Saprophytismb) Saprophytism
  11. 11. - The organism called parasite - Obtain nutrient from living on (ectoparasites) or in (endoparasites) the body of another living organism (host) - They absorbs readily digested food from its host - Examples: fleas (ectoparasites), lice, worms (endoparasites), Rafflesia plant c) Parasitismc) Parasitism
  12. 12. Test YourselfTest Yourself 1. Differentiate between autotrophic and heterotrophic nutrition. A: Autotrophic nutrition – A process in which organisms synthesise organic substances from inorganic substances Heterotrophic nutrition - A type of nutrition in which organism obtain energy through the intake and digestion of organic substances.
  13. 13. 2. Name two types of autotrophic nutrition. A: Photosynthesis and chemosynthesis Test YourselfTest Yourself
  14. 14. 3. Name three types of heterotrophic nutrition. A: Holozoic nutrition, saprophytism and parasitism Test YourselfTest Yourself
  15. 15. 4. Name the nutritional habits of the following organisms; a) Pitcher plants A: holozoic nutrition b) Green algae A: photosynthesis d) Tapeworm A: parasitism Test YourselfTest Yourself

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