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Hello Students, Toady we are starting our Class 8 Science Chapter-2 microorganisms: friends or foes of DAV Book 2021. If You are in class 8 and looking for Class 8 Science Chapter-1 The Cell- Its Structure and Functions CBSE/DAV Book Solution 2021. Then you are absolutely at the right place of knowledge decode

Class 8 Science Chapter 1 : The Cell- Its Structure and Functions 

class 8 science chapter 2 : Microorganisms : friends or foes

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

A.Fill In The Blanks.

B.Math The Following.

C.Tick(√) The Correct Option

D.Answer The Following Questions in Brief 

E.Answer The Following Questions

SOLUTION

A. FILL IN THE BLANKS.

  1. The study of microorganisms is known as microbiology.
  2. The bread dough rises because of the production of production of carbondioxide.
  3. pathogen are the microorganisms that cause diseases.
  4. Sodium benzate and Potassium metabisulfite are two chemical preservatives.
  5. Aspergillus is a fungus that cause food poisoning.

B. MATCH THE FOLLOWING.

1. Ringworm- Fungus

2. Clostridium- Food poisoning

3. Anthrax- Cattle

4. Lactobacillus- Curd

5. Methane- Biogas reactor

3. TICK THE CORRECT OPTION.

1.The process that helps milk last longer but does not kill all microbes present in it is known as-(c)pasteurisation

2.Rust of wheat is caused by-

(a) fungus

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

(d)vaccines.

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

(a)virus.

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

(b)dengu.

D. ANSWER THE FOLLOWING QUESTIONS.

Thank You 😇 Students For being a part of our KNOWLEDGEDECODE Family.


If You found this usefull then don’t forget to share with your classmates and Friends.❤️

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