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Microorganisms Friend and Foe extra questions and Answers



(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

DISEASETYPE OF PATHOGENMODE OF TRANSMISSIONPREVENTIVE MEASURES
Chickenpox1. ..........Physical contact with the infected person and air.Vaccination
CholeraBacterium2. ..........3. ..........
Common coldVirus4. ..........Washing hands, avoiding contact with infected person.
Dengue5. ..........MosquitoesNo vaccine

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


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