Class 8 Science Chapter -2 Microorganisms:Friends or Foes DAV|CBSE Book Solution 2021

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Class 8 Science Chapter 2 Microorganisms:Friends or Foes (Biology)

This Post Contains All The Exercises of Chapter 2 Science Of Class 8 .

A.Fill In The Blanks.
B.Match The Following.
C.Tick(√) The Correct Option
D.Answer The Following Questions in Brief
E.Answer The Following Questions.
Value Based Question
Something To Do

A. Fill in the blanks.

1. The study of microorganisms is known as microbiology.

2. The bread dough rises because of the production of Carbon dioxide.

3. Pathogens are the microorganisms that cause diseases.

4. Sodium Benzoate and Potassium metabisulfite are two chemical preservatives.

5. Aspergillus is a fungus that causes food poisoning.

B. Match the following.

1. Ringworm- Fungus

2. Clostridium- Food poisoning

3. Anthrax- Cattle

4. Lactobacillus- Curd

5. Methane- Biogas reactor

C. Tick the correct option.

1. The process, that helps the milk to last longer but does not kill all microbes present in it, is known as ->

Ans) Pasteurization

2. Rust of wheel is caused by----

Ans) Fungus

3. Medicines, containing killed or weakened pathogens are used to prevent infectious diseases, are called----

Ans) vaccines

4. Which of the following reproduces only inside a host cell----

Ans) Virus

5. A disease, caused by a virus, and spread by an insect is----

Ans)Dengue

Class 8 Science Chapter -2 Microorganisms:Friends or Foes DAV|CBSE Book Solution 2021