Why do we need food? To provide energy To grow To repair worn-out or damaged tissues To maintain general health
To state the types of nutrition To explain autotrophic nutrition To explain heterotrophic nutrition To classify organisms according to the types of nutrition
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
Nutrition : a process by whichorganisms obtain food or nutrients
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)
Photosynthesis All green plant Synthesising organiccompounds from CO2 & H2O in the presence of sunlight.
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.
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
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.)
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
EXERCISE 6.1 Give the difference between autotrophs and the heterotrophs. List three types of heterotrophic nutrition.