What are antibiotics? Name any two examples.
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Antibiotics are chemical substances produced by a living organism which inhibits or kills the growth of micro-organisms that cause the diseases such as fungi and bacteria. Examples of antibiotics are:
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How do bacteria obtain their nourishment?
Describe any two uses of bacteria in industry.
Briefly describe how nitrogen of the atmosphere is converted to nitrates by leguminous plants.
State how the nitrates in the soil get converted to nitrogen of the atmosphere.