Presentation is loading. Please wait.

Presentation is loading. Please wait.

Food and Agriculture Chapter 15.

Similar presentations

Presentation on theme: "Food and Agriculture Chapter 15."— Presentation transcript:

1 Food and Agriculture Chapter 15

2 Feeding the World Objectives Identify the major causes of malnutrition
Compare the environmental costs of producing different types of food Explain how food distribution problems and drought can lead to famine Explain the importance of the green revolution

3 15-1Feeding the World More food needed because of population growth
Some agricultural practices have led to environmental damage

4 We eat food to get the energy to run our body processes
Humans and Nutrition We eat food to get the energy to run our body processes Malnutrition results when the body does not get enough of these nutrients (calories)


6 A healthy diet is one that has a balance of all nutrients
Sources of Nutrition A healthy diet is one that has a balance of all nutrients People in developed countries tend to eat diets high in proteins and fats



9 As populations grow we need more land to grow crops
The Ecology of Food As populations grow we need more land to grow crops Forests cut down

10 Different types of agriculture have different impacts of the environment and levels of efficiency

11 The efficiency of the amount of food produced per given area
Ideally you want practices the produce the most crop but least impact

12 Scientists research and produce plants with higher yield
More energy, water, and land are used to produce a Calorie of food from animals than from plants

13 World Food Problems Most people are malnourished because they don’t get enough food Food is distributed unevenly Droughts and famine

14 Malnurished citizens of Bangladesh

15 The Green Revolution World wide crop yield have increased because of the use of new varieties and the application of modern agricultural techniques

16 Green Revolution

17 Negative impacts Crops often need a lot of water, fertilizer, and pesticides Hurts subsistence farmers

18 Subsistence Farming vs. the Green Revolution

19 Crops and Soil Objectives
Distinguish between traditional and modern agricultural techniques Describe fertile soil Describe the need for soil conservation Explain the benefits and impacts of pesticide use Describe what is involved in integrated pest management Explain how genetic engineering is involved in agriculture

20 The Earth has a limited area of arable land
Can this land support the billions of people on our planet??

21 Agriculture: Tradition and Modern
The basic process of farming includes plowing, fertilization, irrigation, and pest control Most of this work is done by machines in industrialized countries

22 Fertile Soil: The living Earth
Soil that can support the growth of healthy plants is fertile Plant roots grow in topsoil (surface layer of soil)

23 Most soil is formed due to weathering
Composed of living organisms, rock particles, water, air and organic matter Most soil is formed due to weathering


25 Soil porfile

26 Erosion is a global problem
Plants need topsoil to grow Erosion is the weathering of rock or soil River erosion Dust Bowl

27 Land degradation caused by humans and natural processes change land so it can no longer support the local ecosystem

28 Desertification – land becomes more desert-like

29 Soil conservation helps reduce erosion and protects soil Terracing Contour plowing No-till farming


31 Enriching the Soil Traditionally soil was enriched using mostly inorganic material Now inorganics are used Can hurt waterways Composing helps return nutrients to the soil

32 Happens naturally and unnaturally (irrigation)
Salinization Accumulation of salt (salinization) can also damage soil and prevent crops from growing Happens naturally and unnaturally (irrigation)

33 13% of all crops grown in N. America are eaten by insects
Pest Control 13% of all crops grown in N. America are eaten by insects 33% worldwide

34 Farmers use pesticides to protect crops but problems can develop
Harms beneficial plants, insects, wildlife, and people Pesticide resistance Lingers in the environment

35 Biological Pest control
Use of other organisms to control pests Breed plants to be more resistant Disrupting insect breeding

36 Integrated Pest Management
Reduce pest damage to a level that causes minimal economic damage

37 Engineering a Better Crop
Use of genetic engineering to produce more desirable traits

38 Takes genes from one organism and puts in another
Genetically modified plants are a result May have an environmental impact

39 Sustainable Agriculture
Farming that conserves natural resources and helps keep the land productive indefinitely

40 Animals and Agriculture
Explain how overharvesting affects the supply of aquatic organisms for food Describe the current role of aquiculture in providing seafood Describe the importance of livestock in provide food and other products

41 We need animal products in our diet
We have domesticated over 50 animals species Chickens, sheep, cattle, bees, fish, goats, pigs, etc.

42 Food from Water Fish is an important industry world wide 20% of animal protein We have over harvested some fishing areas Led do complete depletion of some species

43 aquiculture Governments began setting limits Aquaculture helps increase number of fish harvested Can cause environmental problems


45 Livestock Chicken, cattle, sheep, pigs, goats, etc. Large farms produce most of the food we produce Use in farming in developing nations

46 Manure is used for fertilizer
Are we treating these animals humanely World wide our meat consumption has increased


Download ppt "Food and Agriculture Chapter 15."

Similar presentations

Ads by Google