Food Production
Visão Geral
From the bread on your table to the salmon on your plate, humans have developed ingenious ways to harness living organisms for food production. Farmers manipulate growing conditions in glasshouses, add fertilisers, deploy biological pest control, and raise fish in carefully managed enclosures - all to feed a growing population more reliably.
This topic takes you through modern food production methods: how glasshouses boost crop yields, why biological control can outperform pesticides, how yeast and bacteria transform raw ingredients into bread and yoghurt, and what makes industrial fermenters so effective. You will also explore the principles behind fish farming and why it has become an important protein source worldwide.
Objetivos
- Describe how glasshouses and polythene tunnels can be used to increase the yield of certain crops
- Understand the effects on crop yield of increased carbon dioxide and increased temperature in glasshouses
- Understand how the use of fertiliser can increase crop yield
- Understand the reasons for pest control and the advantages and disadvantages of using pesticides and biological control with crop plants
- Understand the role of yeast in the production of food including bread
- Investigate the role of anaerobic respiration by yeast in different conditions
- Understand the role of bacteria (Lactobacillus) in the production of yoghurt
- Understand the use of an industrial fermenter and explain the need to provide suitable conditions in the fermenter
- Understand the methods used to farm large numbers of fish to provide a source of protein
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- Which gas is added to a glasshouse to increase crop yield? A) Oxygen B) Nitrogen C) Carbon dioxide D) Methane Answer: C
- Which bacterium is used in the production of yoghurt? A) E. coli B) Lactobacillus C) Streptococcus D) Salmonella Answer: B
- What is the role of carbon dioxide produced by yeast in bread making? A) It flavours the bread B) It kills bacteria in the dough C) It causes the dough to rise D) It preserves the bread Answer: C
- Why does an industrial fermenter have a water-cooled jacket? A) To speed up the reactions B) To provide water for the microorganisms C) To prevent the temperature rising too high D) To sterilise the contents Answer: C
- Which of the following is an advantage of biological control over pesticides? A) It works faster B) It eliminates the pest completely C) It does not cause chemical pollution D) It is cheaper to set up Answer: C
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