GM food crops

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4E Elective geog - Geog of food

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GM food crops

  1. 1. Genetically Modified Food
  2. 2. What is a GM food crop?• Genetically-modified (GM) food is produced from plants or animals which have had their genes changed in the laboratory by scientists.
  3. 3. What is a GM food crop?• Scientists have been tinkering with the DNA of commercial food for nearly two decades, and they’ve covered most of the food pyramid.• Modern soybeans, cotton, tomatoes, potatoes, corn, rice, and sugarcane have all had their genomes tweaked to serve the human species.
  4. 4. Video Time http://www.teachersdomain.org/
  5. 5. Watch the video carefully and answer the following questions:Q1) According to the video, why have fruits and vegetables been modified?Q2) How is genetic engineering different from traditional breeding?Q3) What is the modern scientific view of nature?Q4) Which is the common gene amongst most living things?Q5) According to scientists, why does moving a single gene not affect the essence of a life form?
  6. 6. AnswersQ1) For the benefit of human beings.Q2) Unlike traditional breeding, genetic engineering allows scientists to insert a gene from one specie into another specie.Q3) All living species have a specific DNA.Q4) Cytochrome CQ5) Every life form is made up of tens of thousands of genes.
  7. 7. Examples of GM food
  8. 8. Purpose - Why was it invented?
  9. 9. Purpose - Why was it invented?• GM food or food created for human or animal consumption.• To increase crop production to meet the demands of increasing world population.
  10. 10. 1.Improvement in nutritional value of food• Food can be modified to contain higher nutritional value.• For example ‘Golden Rice’ that has built-in vitamin A that prevents blindness.
  11. 11. 2. Increase in farmer’s income.• GM food crops are more resistant to pests, can tolerate low rainfall and are free from problems faced by traditional food crops.• For example, a pest-resistant corn plant can be created by inserting a bacterium,Bacillus thuringienis into a corn plant.• With few damaged food crops, farmers are able to enjoy an increase in output and income.
  12. 12. 3. Increase in food supply.• Farmers can enjoy higher outputs.• Super Rice produces double the output of normal rice.• A higher output means an increase in food supply and a drop in food prices.• Thus, producing GM foods can makefood more affordable in LDCs.
  13. 13. 4. Reduction of environmental pollution• Food can be genetically modified to reduce their reliance on chemical fertilisers, pesticides and herbicides.• For example, in China, farmers growing GM rice have reduced their pesticide use by nearly 80 percent and more than half of them use no pesticide at all.• Many crops including tomatoes, corn, potato and cotton now have the internal ability to repel insects thus reducing the amount of application.
  14. 14. Quiz Time Fill in the blanks with the appropriate words.Q1) Genetically modified food refers to food from plants and animals that have been genetically altered to create desired _________________. qualities/traits
  15. 15. Quiz Time Fill in the blanks with the appropriate words.Q2) GM food has helped to increase crop ____________ which has helped farmers to have an increased _______________.output/production……..income
  16. 16. Quiz Time Fill in the blanks with the appropriate words.Q3) ____________ is a GM food crop that produces double the output of normal rice. Super rice
  17. 17. Quiz Time Fill in the blanks with the appropriate words.Q4) Producing GM food crops can make food more ________ in LDCs. affordable
  18. 18. Quiz Time Fill in the blanks with the appropriate words.Q5) Golden Rice is enriched with beta-carotene to supplement the lack of _________ in rice diets of people in LDCs. vitamin A
  19. 19. Quiz Time Fill in the blanks with the appropriate words.Q6) Food can be modified to increase their tolerance against chemicals such as fertilisers, pesticides and __________________. herbicides
  20. 20. Recap• What GM food is.• The purpose of GM food.• The advantages of GM food.• Next lesson we would be examining the controversies surrounding GM food so please read up TB pages 277 – 281.

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