Class 8 Science Chapter 2 Test Paper Set-1 Pdf Download CBSE

Test Paper Of Class 8 Science Chapter 2 Biology Microorganisms: Friend and Foe

Also Visit Our Youtube Channel PGRMS or Click Here

Chapter 2 Test Paper (01)

Class 8 Science Chapter 2 Microorganisms: Friend and Foe Test Paper Set-1 Text Form:-

PGRMS Education

Class 8 Science (Worksheet with answers)

Chapter – 2 (MICROORGANISMS : FRIEND AND FOE)

A. Multiple Choice Questions (MCQ) :-

1. The algae containing brown pigment along with chlorophyll is :

(a) Green algae

(b) Brown algae

(d) Blue-green algae

2. The microorganism smaller than bacteria are:

(a) Viruses

(b) Protozoans

(d) Algae

3. A preparation of modified viruses or bacteria to induce immunity in human body is known as :

(a) Vaccine

(b) Antibiotic

(d) Vector

4. Bacterial blight of rice can be controlled by giving ‘Hot Water’ seed treatment at.

4343 degrees C for 3535 mm
5353 degrees C for 3030 mm
5959 degrees C for 2525 mm
6262 degrees C for 2020 mm

5. Smallest animal virus is

Pox virus
Coliphage
Rhino virus
Polio virus

B. Fill in the blanks:-

The ……………………………….. bacteria increases soil fertility by the process of nitrogen fixation.
Curd contains bacterium ………………………………..
Diseases like dysentery and malaria are caused by ………………………………..
Bacteria like salmonella and staphylococci cause……………………………….. .
The disease causing microorganisms are known as………………………………..

C. Subjective Questions ( Short Answers type Questions)

1.What are the major groups of microorganisms ?

2.Name the microorganims which can fix atmospheric nitrogen in the soil.

3.What are pathogens ?

4.What are communicable diseases ? Give two examples.

5.Why does the milk that comes in packets not spoil My mother told me that the milk is ‘pasteurized’.What is pasteurization?

6.The conversion of sugar solution into alcohol and liberation of carbon dioxide is known as fermentation. Which microorganism is responsible for this process?

7.Why are infectious diseases called as communicable diseases?

8.Mention a product of human welfare obtained with the help of the following microbes Aspergillus niger.

9.Name the disease caused by Plasmodium vivax

10.How does malaria differ from chikungunya with reference of their vectors?

11.In which situations process of fermentation is useful in daily life?

12.Your neighbor’s children appear with swollen legs, hands and other body parts.Thay have dry skin and frequently suffering from Diarrhoea. What are the reasons for ? What suggestions do you give to the patient?

13.Name the genus to which baculovirus belong. Describe their role in integrated pest management progress.

14.Write a short paragraph on the harmful effect of microorganism.

D. Long Answers Type Questions:-

1. How are the actions of microorganisms useful and harmful for us ?

2. What are antibiotics ? What precautions must be taken while taking antibiotics ?

3. How nitrogen fixation takes place in the soil ? Explain the process with the help of a cycle.

4. The female mosquito is not considered a parasite, although it needs our blood for reproduction. Explain why?

Class 8 Science Chapter-wise Test Paper:-