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Answers
Answer:
1. Why a person suffers from food poisoning?
Ans: Infectious organisms — including bacteria, viruses and parasites — or their toxins are the most common causes of food poisoning. Infectious organisms or their toxins can contaminate food at any point of processing or production. Contamination can also occur at home if food is incorrectly handled or cooked.
2. What are preservatives?
Ans: A preservative is a substance or a chemical that is added to products such as food products, beverages, pharmaceutical drugs, paints, biological samples, cosmetics, wood, and many other products to prevent decomposition by microbial growth or by undesirable chemical changes.
3. Define Pasteurisation.
Ans: Pasteurization or pasteurisation is a process in which packaged and non-packaged foods (such as milk and fruit juice) are treated with mild heat, usually to less than 100 °C (212 °F), to eliminate pathogens and extend shelf life.
4. Name the bacteria involved in nitrogen fixation and where is its location?
Ans: The Rhizobium or Bradyrhizobium bacteria are involved in nitrogen fixation and located at the root nodules of leguminous plants.
5. Can we see microorganisms with the naked eye? If not so, how can we see it?
Ans: No, we cannot see the microbes through our naked eyes as they are very minute. We can see it through the microscope.
6. Alcohol is produced with the help of a process called fermentation. In fermentation, we use ethanol or yeast.
7. Some prepared by the action of microorganisms are curd, alcohol, vinegar, bread etc.