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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.
- The study of microorganisms is known as microbiology.
- The bread dough rises because of the production of production of carbondioxide.
- pathogen are the microorganisms that cause diseases.
- Sodium benzate and Potassium metabisulfite are two chemical preservatives.
- 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.
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