Questions and answers
Class 8, Chapter 2 - Microorganisms: Friend and foe | NCERT
All questions and answers from this set. What are microorganisms. What diseases they cause and how to prevent them. Science class 8 chapter 2 exercise test and solutions.
Questions: 11
Played: 458 times
Question 1
Which microorganisms reproduce only inside cells of host organism?
viruses
Question 2
Which diseases are caused by protozoa?
dysentery
malaria
Question 3
Amoeba is a representative of:
Protozoa
Question 4
Which microorganisms may be multicellular?
algae
fungi
Question 5
Which statements are true?
Microorganisms are used in agriculture for fixing nitrogen.
True
Fungi is used in curd production.
False
Yeast produces nitrogen during respiration.
False
Question 6
What is fermentation?
It is a process of conversion of
sugars
into alcohol
.Question 7
Match a scientist with his discovery
Alexander Fleming
penicillin
Louis Pasteur
fermentation
Edward Jenner
smallpox vaccine
Robert Koch
Bacillus anthracis
Question 8
Describe process of milk pasteurisation.
Milk is heated to about
70°C
for 15 to 30
seconds and then suddenly
chilled.Question 9
AIDS is caused by:
a virus
Question 10
How do we call insects and animals that can pass a diseasce causing microbes to us?
carriers
Question 11
How much of the Earth's atmosphere is made up of nitrogen?
78%
