Class 8 science chapter 2 extra questions and Answers

In this page we have Class 8 science chapter 2 extra questions and Answers . Hope you like them and do not forget to like , social share and comment at the end of the page.

Very Short Answer type

(a) Name the types of bacteria?

(b) What is fermentation?

(c) What is vaccination?

(d) What is pasteurization?

A technique that is used to preserve milk is called pasteurization.

(e) What is an electron microscope?

2. Complete the table

Complete the following table by using the correct option:

a. Virus
b. Air
c. Vaccination
d. Contaminated food or water

Class 8 science chapter 2 extra questions and Answers

3. Short answer type questions (HOTS)

(i) What are microorganisms ?

(ii) Describe algae in brief with examples?

(iii) Difference between algae & protozoa ?

(iv) How viruses behave inside the host?

(v) What is the official name of Coronavirus?

(vi) Write any two uses of microorganisms?

(vii) Describe Fermentation?

(viii) Define Pathogens? And give some examples of air borne diseases?

4. Long Answer type Question

(i) Describe Bacteria & it’s types with diagrams?

(ii) What do you mean by food preservation? Explain any four food preservation methods.

(iii) What exactly are antibiotics? What precautions should be taken when using antibiotics?

(iv) Explain through a brief note Can microorganisms be harmful to humans?

5. Multiple Choice Questions (MCQ)

(1) Branch of science that involves the study of microorganisms is called
(I) Biology
(II) Microbiology
(III) Zoology
(IV) None of these

(2) Algae are
(I) Unicellular
(II) Multicellular
(III) Unicellular or Multicellular
(IV) None of these

(3) Which one of them is not an algae
(I) Volvox
(II) Chlamydomonas
(III) Trypnosoma
(IV) Spirogyra

(4) The Bread Mould
(I) Rhizopus
(II) Agaricus
(III) Yeast
(IV) Penicillium

(5) Viruses that can infect bacteria
(I) Influenza virus
(II) Hepatitis virus
(III) Poliovirus
(IV) Bacteriophages

(6) Microorganisms which are used for medicines
(I) Penicillium
(II) Streptomycin
(III) Oxytetracycline
(IV) All of them

(7) Which one of them is an example of viral disease
(I) Cholera
(II) Common cold
(III) Malaria
(IV) Typhoid

(8) Which one of them is not an example of communicable disease
(I) Ringworm
(II) Tuberculosis
(III) Asthma
(IV) Anthrax

(9) Which one of them is an example of plant disease
(I) Citrus canker
(II) Malaria
(III) Cholera
(IV) Typhoid

(10) The micro-organism which is capable of converting sugar into alcohol and carbon dioxide is :
(I) bacterium
(II) fungus
(III) alga
(IV) protozoan


This Class 8 science chapter 2 extra questions and Answers sheet is prepared keeping in mind the latest syllabus of CBSE . This has been designed in a way to improve the academic performance of the students. If you find mistakes , please do provide the feedback on the mail.

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