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