Applications in Agriculture and Industry: fermentation in food production, genetically modified crops, industrial enzymes and biofuels, and bioremediation of waste and pollution

What this module is about

Outside medicine, biotechnology feeds us, farms for us, manufactures for us and cleans up after us. This module covers four big application areas: fermenting food, modifying crops, producing enzymes and biofuels, and using microbes to treat waste and pollution. Each one returns to the core idea of the course, a living tool turning a raw material into a useful output, and each invites you to weigh benefits against concerns.

The full set of dot points for this module is at /sg-o-level/biotechnology/syllabus/applications-in-agriculture-and-industry.

Fermenting food and drink

The dot point on biotechnology in food production is traditional biotechnology in action. Yeast ferments sugars into ethanol and carbon dioxide, brewing alcohol and raising bread; bacteria ferment the sugars in milk into lactic acid to make yoghurt and cheese; and microbes make foods such as soy sauce. The pattern is always the same: a named microbe converts a named raw material into a named product, which is exactly how to phrase an exam answer.

Improving crops: genetic modification

The dot point on genetically modified crops applies genetic engineering to plants. A useful gene (for pest resistance, drought tolerance or extra nutrients) is inserted into crop cells with a vector, and the modified cells are grown into whole plants. The benefits include higher yields, less pesticide use and better nutrition; the concerns include effects on other organisms and ecosystems, the spread of genes to wild plants, and social and economic issues around seed control. A balanced answer states both sides.

Manufacturing with enzymes and biofuels

The dot point on industrial enzymes and biofuels covers two industrial workhorses. Enzymes speed up reactions under mild conditions, saving energy, working quickly and specifically, and often being reusable, which is why they appear in detergents and food processing. Biofuels are fuels made from living material: bioethanol is made by using yeast to ferment crop sugars into ethanol, and it is renewable unlike fossil fuels, though growing the crops has its own costs. The advantage of enzymes is usually energy and specificity; the advantage of biofuels is renewability.

Cleaning up: bioremediation

The dot point on bioremediation and the environment uses microbes as cleaners. Bacteria digest organic matter in sewage treatment, certain microbes break down oil after a spill, and others degrade harmful chemicals in contaminated soil. Bioremediation harnesses the natural ability of microbes to feed on and break down substances, often more cheaply and gently than physical or chemical clean-up.

How the module fits together

• Fermentation feeds us. Name microbe, raw material and product every time.
• GM improves crops, with trade-offs. Always balance benefit against concern.
• Industry values speed and specificity. Enzymes save energy; biofuels are renewable.
• Microbes clean up. Bioremediation uses natural breakdown to treat waste and pollution.

Check your knowledge

A mix of recall and evaluation across the four dot points. Try them timed, then check the solutions.

1. State the microbe, raw material and product for two fermented foods or drinks. (3 marks)
2. Describe how a crop is genetically modified to gain a useful trait. (2 marks)
3. Give two advantages of using enzymes in industry. (2 marks)
4. Explain why bioethanol is described as a renewable fuel. (2 marks)
5. Give one example of bioremediation. (1 mark)