Efficiency of Food Production

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Efficiency of Food Production

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  1. The efficiency of food production

    Slide 1 - The efficiency of food production

    • Aim: To learn how the efficiency of food production can be improved. To understand intensive food production, ‘free-range’ farming and management of fish stocks.
    • Keywords: Intensive farming, fertilisers, pesticides, energy loss, excretion, free-range farming, detritus feeders, microorganisms, efficiency.
  2. Which food contains the most energy?

    Slide 2 - Which food contains the most energy?

    • Why might some foods contain more energy than others?
    • Can a chicken from one farm contain more energy than a chicken from another farm?
  3. Efficiency of food production

    Slide 3 - Efficiency of food production

    • Pyramids of biomass show us that organisms at each successive stage of a food chain contain less material and therefore less energy.
    • What implications are there for how we produce food?
  4. Efficiency of food production

    Slide 4 - Efficiency of food production

    • Food production is more efficient if the food chain is short, because a higher percentage of energy is available to us.
  5. Efficiency of food production

    Slide 5 - Efficiency of food production

    • The efficiency of food production can be improved by reducing the amount of energy lost to the surroundings. This can be done by:
    • preventing animals moving around too much
    • keeping their surroundings warm
    • Why does this help with efficiency?
  6. Efficiency of food production

    Slide 6 - Efficiency of food production

    • Mammals and birds maintain a constant body temperature using energy released by respiration.
    • As a result, their energy losses are high.
    • Keeping pigs and chickens in warm sheds with little space to move around allows more efficient food production as they respire less.
    • Is this acceptable morally?
  7. Task 1

    Slide 7 - Task 1

    • Review what you have just seen, go back if necessary.
    • Write a short paragraph, using the title Efficiency of food production to explain how food production can be made efficient.
  8. Intensive farming

    Slide 8 - Intensive farming

    • Intensively farmed food is where farmers aim for as large as a yield as possible with as few losses.
    • Intensive farmers add inputs to maximize the yield:
    • Pesticides
    • Fertilisers
    • Water
    • Antibiotics (to keep animals healthy)
  9. Intensive farming practices

    Slide 9 - Intensive farming practices

    • Intensive farming practices include growing high-yield crops, using fertilisers and pesticides and keeping animals indoors.
    • Food production is increased but there are unwelcome side effects.
  10. Task 2

    Slide 10 - Task 2

    • Review what you have just seen, go back if necessary.
    • Write a short paragraph, using the title Intensive farming practices to explain what intensive farming means.
  11. Watch the video

    Slide 11 - Watch the video

  12. Evaluation of farming practices

    Slide 12 - Evaluation of farming practices

    • Intensive farming
    • Pros
    • Cons
    • Produces large yields
    • High inputs
    • Cheaper food
    • Pesticides potentially damaging to health and environment
    • Quality of food the same
    • Manure can cause pollution
    • Products free of insects
    • Concerns over animal welfare
    • Products free of blemishes
    • Less human input
  13. Evaluation of farming practices

    Slide 13 - Evaluation of farming practices

    • ‘Free-range’ farming
    • Pros
    • Cons
    • Reduced use of pesticides
    • Often lower yields
    • Mixed farms so wastes are recycled
    • Food more expensive
    • Less soil erosion
    • More losses due to pests
    • Better animal welfare
    • Products may have blemishes
    • Better tasting?
    • Quality of products vary
    • Healthier food?
    • More human input
  14. Task 3

    Slide 14 - Task 3

    • Review what you have just seen, go back if necessary.
    • Complete the Efficiency of food production worksheet and then stick this into your book.
  15. Sustainable food production

    Slide 15 - Sustainable food production

    • As the population of the Earth keeps increasing we need to be more aware of sustainable food production
    • This means producing food in ways that can continue for many years
    • Maintaining the health of the soil so crops can grow well every year
    • Producing food that reduces the stages in the food chain
    • Taking care of fish stocks in the ocean
  16. Sustainable food production

    Slide 16 - Sustainable food production

    • Read the following resources on fish stocks:
    • Fish Stocks article
    • Conserving Fish Stocks
  17. Sustainable food production

    Slide 17 - Sustainable food production

    • Watch the following video on fish stocks and by-catch:
  18. Task 4

    Slide 18 - Task 4

    • Review what you have just seen, go back if necessary.
    • Write a short paragraph, using the title Sustainable food production, to explain what this means.
    • Use the conservation of fish stocks and overfishing as examples of how we can manage food production sustainably
  19. If you have completed the work….

    Slide 19 - If you have completed the work….

    • Prepare for the next topic by watching these great videos:
    • Photosynthesis and food
    • The carbon cycle
    • Then see JPL for the next piece of work!
  20. Photosynthesis and food

    Slide 20 - Photosynthesis and food

  21. The carbon cycle

    Slide 21 - The carbon cycle