Question

15. Which of the following is not a use of micro-organisms?

a) Recycling of materials in nature.
b) Preservation of food.
c) Preparation of antibiotics.
d) Increasing the fertility of soil.​

Answer 1

Answer:

1. Microorganisms recycle nutrients in the environment, by decomposing organic materials. Organic materials, such as animal carcasses and tree trunks, decay by the action of decomposing microbes, that means recycling of materials in nature is done by microorganisms.
2. Preservation of food usually involves preventing the growth of bacteria, fungi and other microorganisms. A number of methods of prevention can be used that can either totally prevent, delay, or otherwise reduce food spoilage, that means preservation of food is not done by microorganisms.
3. Antibiotic is commercially exploited secondary metabolites produced by bacteria, fungi, etc. Most of the antibiotics used today are from the microbes. Bacteria are easy to isolate, culture, maintain and to improve their strain, that means antibiotic preparation uses microorganisms.
4. Microorganisms such as bacteria and fungi play an important role in maintaining the soil fertility. Microbial action on dead organic matter releases nutrients in the soil thus raising the fertility status of the soil, that means microorganisms are important for soil fertility.

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