Flashcards
Class 8, Chapter 2 - Microorganisms: Friend and foe | NCERT
Which microorganisms reproduce only inside cells of host organism?
bacteria
protozoa
algae
viruses
fungi
Which diseases are caused by protozoa?
influenza
tuberculosis
dysentery
malaria
cold
Amoeba is a representative of:
Algae
Bacteria
Protozoa
Fungi
Which microorganisms may be multicellular?
bacteria
algae
fungi
protozoa
True or false?
Microorganisms are used in agriculture for fixing nitrogen.
True or false?
Fungi is used in curd production.
True or false?
Yeast produces nitrogen during respiration.
What is fermentation?
It is a process of conversion of sugars into alcohol.
Match a scientist with his discovery
Alexander Fleming
penicillin
Match a scientist with his discovery
Louis Pasteur
fermentation
Match a scientist with his discovery
Edward Jenner
smallpox vaccine
Match a scientist with his discovery
Robert Koch
Bacillus anthracis
Describe process of milk pasteurisation.
Milk is heated to about 70°C for 15 to 30 seconds and then suddenly chilled.
AIDS is caused by:
a bacteria
a fungi
a protozoa
a virus
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?
81%
73%
65%
78%
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