1. While making cake or dhokla, the dough rises because of a substance that is produced during
fermentation. What substance is this? Why does it cause the dough to rise?
2. To prevent a disease caused by a certain microbe, doctors inject the same microbes in a person's
blood. How is it ensured that this prevents the disease instead of causing it? What is this
process of injecting microbes called?
3. Microbes that live inside the bodies of animals normally cause diseases. However, some of them
also help animals. Give an example to prove this point
4. Pasteurization means boiling the milk to kill germs. Do you agree? Give reasons.
Answers
Answer:
1) While making the dough of cake or dhokla we put some yeast in it to make it fluffy and soft. yeast reproduces rapidly in the dough and produces carbon dioxide which makes the amount of cake to be increased and makes it fluffy and soft.
2)To prevent a disease vaccinations are given to the Patient. actually, vaccines are the suspensions of dead or weakened microorganisms of any particular disease when vaccines are injected into patients body it makes the body to produce antibodies against that disease.
3)Some microorganisms are very useful to us for exp. lactobacillus helps in the production of curd. A bacteria is present in the digestive system of cows that helps them to digest cellulose from plants.
4) pasteurization is the quick heating of milk at around 100°C and then storing it into refrigerators.
Explanation:
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