Question

Explain the uses and the harmful effects of micro-organisms.

Answer 1

Use of microorganisms:
1. Lactobacillus is used in setting of curd.
2. Yeast is used in making cakes, pastries, dosas and idli batter.
3. Some microbes are used to kill or stop the growth of disease causing microbes. e.g. Penicillin, streptomycin etc.
4. Microbes such as rizobium and blue green algae are used to increase nitrogen content of soil.
5. Dead or weakened microbes are used in vaccine to prevent various diseases.

Harmful effects of microorganisms:
1. microbes called pathogens spread diseases.
2. Spoil food which can cause food poisoning and even death.
3. Spoil leather products.

Answer 2

$\bold{\underline{Micro organisms are useful, because}}}$

➜they help is making the food tasty

➜ they are useful as bio pesticides to kill the pests

➜several bacteria helps in the process of sewage treatment

➜they are used in the manufacture of antibiotics

➜they decompose they organic matter and make soil fertile

$\bold{\underline{ micro organisms are harmful,because}}}$

➜ they cause dreadful disease

➜they spoil the feel causing food poisoning

➜they block water pipes