food supply, plant growth and productiviyt

• food security

  the availability of human populations to access food of sufficient quality and quantity
• why is food security an issue?

  the human population is increasing but the land available on earth is limited, so there is greater competition for resources
• sustainable food production

  food is produced and can continue to be produced without degrading natural resources that agriculture is dependent on
• how can we increase food production?

  • understanding factors that affect food growth@
  • breeding higher yeilding cultivars
  • fertilisers
  • protecting crops from pests, disease, competition
• some energy is lost in the food chain by

  • released by respiration and used for movement
  • lost as heat
  • lost in waste materials
• all food production is dependent on

  photosynthesis