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MCQ Questions for Class 8 Science Chapter 2 Microorganisms: Friend and Foe with Answers

 

Microorganisms: Friend and Foe Class 8 MCQs Questions with Answers

I. Choose the correct option.

Question 1.
Tiny organisms which cannot be seen with the naked eyes are called
(a) microorganisms
(b) animals
(c) fungi
(d) bacteria

Answer

Answer: (a) microorganisms


Question 2.
Microorganisms are also known as
(a) yeast
(b) microbes
(c) viruses
(d) Amoeba

Answer

Answer: (b) microbes


Question 3.
Fungus can be seen with a
(a) microscope
(b) telescope
(c) magnifring glass
(d) both (a) and (c)

Answer

Answer: (d) both (a) and (c)


Question 4.
Microorganisms that causes disease are also known as
(a) pathogens
(b) fungi
(c) antigen
(d) microbes

Answer

Answer: (a) pathogens


Question 5.
Pathogens are also called
(a) germs
(b) antigen
(c) antibody
(d) carrier

Answer

Answer: (a) germs


Question 6.
Bacteria are ______ organisms.
(a) multicellular
(b) unicellular
(c) bicellular
(d) tricellular

Answer

Answer: (b) unicellular


Question 7.
Bacilli are the bacteria that are
(a) rod-shaoed
(b) comma-shaDed
(c) curved-shaped
(d) spiral

Answer

Answer: (a) rod-shaoed


Question 8.
Spherical-shaped bacteria are called
(a) bacilli
(b) vibrio
(c) spirilla
(d) cocci

Answer

Answer: (d) cocci


Question 9.
Simple, plant-like microorganisms are called
(a) algae
(b) bacteria
(c) both (a) and (b)
(d) protozoa

Answer

Answer: (a) algae


Question 10.
Medium that transmits pathogens from an infected person to a healthy one is called
(a) fungi
(b) germs
(c) carrier
(d) none of these

Answer

Answer: (c) carrier


Question 11.
Medicine that kills or stops the growth of harmful disease-causing microbes is known as
(a) antibiotic
(b) antibody
(c) antigen
(d) vaccine

Answer

Answer: (a) antibiotic


Question 12.
The process in which sugar in the food is transformed into alcohol and carbon dioxide by using microorganisms is known as
(a) transformation
(b) beverage
(c) fermentation
(d) respiration

Answer

Answer: (c) fermentation


Question 13.
The fungus that is commonly used in bakery and beverage industries is
(a) Penicillium
(b) Yeast
(c) Agaricus
(d) Rhizopus

Answer

Answer: (b) Yeast


Question 14.
Giardia is listed under the category of
(a) fungi
(b) protozoa
(c) bacteria
(d) algae

Answer

Answer: (b) protozoa


Question 15.
Substance used to produce immunity against diseases in the living body is called
(a) immune
(b) vaccine
(c) antibody
(d) antigen

Answer

Answer: (b) vaccine


II. Fill in the Blanks

Question 1.
Bacteria, fungi, protozoa and …………….. are the major four groups in which microorganisms are classified.

Answer

Answer: algae


Question 2.
Two microorganisms which live in symbiotic association in lichens are …………….. and ……………..

Answer

Answer: algae, fungus


Question 3.
We use a …………….. to see the microorganisms.

Answer

Answer: microscope


Question 4.
…………….. are considered different from other microorganisms because they can multiply only by entering , the host organisms.

Answer

Answer: Viruses


Question 5.
The gas released during the preparation of bread is ……………..

Answer

Answer: carbon dioxide


Question 6.
The disease caused by a protozoan and spread by an insect is ……………..

Answer

Answer: malaria


Question 7.
…………….. are curved-shaped bacteria.

Answer

Answer: Vibrio


Question 8.
Saprophytes and …………….. are the two main categories of fungi.

Answer

Answer: parasites


Question 9.
…………….. are the threads of the multicellular fungi.

Answer

Answer: Hyphae


Question 10.
Yeast is a …………….. fungus.

Answer

Answer: unicellular


Question 11.
Protozoa are …………….. in nature

Answer

Answer: heterotrophic


Question 12.
Flu, cough and cold are caused by ……………..

Answer

Answer: viruses


Question 13.
The first antibiotic discovered was ……………..

Answer

Answer: penicillin


Question 14.
…………….. are the microorganisms that help in the process of decomposition.

Answer

Answer: Decomposers


Question 15.
The process of formation of curd from milk is known as the …………….. of milk.

Answer

Answer: curdling


IV. True or False

Question 1.
Microbiology is the science of study of microbes.

Answer

Answer: True


Question 2.
All the microorganisms are harmful.

Answer

Answer: False


Question 3.
An instrument called microscope is required to see the microorganisms.

Answer

Answer: True


Question 4.
Bacteria have an organised nucleus.

Answer

Answer: False


Question 5.
Microorganisms are found in large number around us.

Answer

Answer: True


Question 6.
Viruses are the most useful microbes.

Answer

Answer: False


Question 7.
Anabaena is listed in the category of algae.

Answer

Answer: False


Question 8.
Algae tend to develop on wet surfaces.

Answer

Answer: True


Question 9.
Amoebic dysentery is caused by algae.

Answer

Answer: False


Question 10.
A fungi is used in the production of alcohol.

Answer

Answer: True


Question 11.
Jellies, jams and squashes are preserved by adding vinegar to them.

Answer

Answer: False


Question 12.
Salt is used as a food preservative.

Answer

Answer: True


Question 13.
Oxygen alone constitutes 78% of air.

Answer

Answer: False


IV. Match the following

Table

Answer

Answer:
False



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