sources of food new

sources of food new

1. crops

   • sunlight
     • water
       • Air
         • required for growth
           • regulated by plant horemones
             • Also used in ripening of fruit
             • Weed killers
   • biological control
     • natural enemies
   • chemical control
     • herbicides
     • pesticides
       • cause pollution
         • air and water pollution
   • Soil
     • fertilisers
       • nutrients
     • Appropriate PH
       • Litmus paper,universal indicator, pH meter

2. Need to be increased due to

   • Space limtation
   • Increase in world population

3. can be increased by

   • intensive production methods
   • improving plant and animal varieties