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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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