SOURCES OF FOOD

SOURCES OF FOOD

1. Plants

   • carry out photosynthsis to make food
     • raw materials : carbond dioxide and water
       • End product: Sugar and oxygen
         • Conditions : sunlight and chlorophyll

2. Soil Conditions

   • Ph
     • Tests
       • Lutmus Paper:
         • Blue lutmus paper turn
           • RED: Acidic
         • Red lutmas paper turn
           • BLUE: Alkaline
       • Universal Indicator
         • Neutral:GREEN
         • Acidic: RED, Alkaline:BLUE/PURPLE
     • Acidic: Sour, Alkaline : Bitter
   • Fertilisers : Add nurients to the soil
     • Contamination of water, Negative impact on aquatic life
       • Algae bloom (eutrophication)
         • algae covers water surface, plants and animal in the water dies

3. Slush and Burn

   • *method to clear the land
     • -Cheap and easy method , - eye irrtation andbreathing problmas forest fire, -air pollution

4. Production of Crops

   • Biological Control: uses natural enemies
     • Pros: enviroment friendly
   • Chemical Control: Pesticides and herbicides
     • pros: kills pests and weeds
       • Cons: soil contaminaton, water contamitation, chemical contamination in food

5. Improve food production

   • High Tech Method
     • e.g: Vertical farming, hydroponics, aeroponic
   • Intensive Production Method
     • e.g : Fish Farm Tanks
   • Improve Plant and animal varieteis