Question

1.Where do micro-organisms live?
2. Micro organisms are “friend and foe” for us. Some micro-organisms are good for us and some are
harmful for us.
a) In what ways micro-organisms are beneficial to us?
b) How do micro-organisms prove to be harmful for us?
3. Match the organisms in Column A with their action in Column B.
Column A Column B
i) Bacteria a) Fixing nitrogen
ii)Rhizobium b) Setting of curd
iii) Lactobacillus c) Baking of bread
iv) Yeast d) Causing malaria
v) A protozoan e) Causing cholera
vi) A virus f) Causing AIDS
4. Vaccines are dead or weakened microbes introduced into the body to produce antibodies to fight
the disease.
a) Who is known as Father of Immunology?
b) Name any two vaccines you have got in your childhood.( Check your vaccination schedule)

Answer 1

1. Microorganisms live almost everywhere on earth.
2. The antibodies remain in the body for a long time and protect us from the disease causing microbes

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Answer 2

Answer:

the microorganism can live anywhere in our body or in outside somewhere. (ii)- some microorganism are foe because it help in converting milk to curd due to lactobacillus bacteria. and they can be harm because it can take disease in humans and animals both. (3)-1- bacteria- baking of bread. , rhizobium - fixing nitrogen. , lactobacillus - setting of curd. , yeast - causing cholerea.

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