Question

1. Diseases like polio and chicken pox are caused by
a) Bacteria
b) Fungi
c) Virus
d) Worms
2. Examples of Multicellular Microorganism are
a) Algae, Bacteria b) Bacteria and Fungi c) Bacteria and Viruses d) Algae and Fungi
3. Some medicines obtained from micro-organisms are applied to kill or stop the growth of disease-
causing microorganisms. Such medicines are called
a) Antibodies b) Antibiotics c) Antiseptics d) All of the above
4. A common preservative used in jam and pickles is
a) Sodium benzoate b) Nitric acid. c) Sodium Chloride d) Copper Sulphate
5. Rhizobium found in root nodules of leguminous roots is an
a) Atmospheric Carbon fixer
b) Atmospheric Oxygen fixer
c) Atmospheric Nitrogen fixer
d) All of the aboveh​

Answer 1

Answer:

1 (c)

2(d)

3(b)

4(a)

5(c)

Answer 2

Explanation:

1. c) Virus

The correct answer is 'viruses'

Diseases like polio and chickenpox are caused by viruses poliovirus and varicella zoster virus. 

2. d) Algae and Fungi

Multicellular organisms are those that are made up of millions of cells.

Algae – Photosynthetic multicellular organisms.

Fungi – Multicellular nonphotosynthetic organisms.

3. b) Antibiotics

Antibiotics are powerful medicines that are produced by fungi to fight bacterial infections.

4. a) Sodium Benzoate

There are many chemical preservatives used in food industry. Sodium benzoate is generally used is ketchups, pickles, jams etc.

5. c) Atmospheric Nitrogen Fixer

Rhizobium is a bacterium found in the root nodules of leguminous plants. It induces the formation of special structures called nodules inside which it fixes atmospheric nitrogen.