Flashcards
Class 8, Chapter 2 - Microorganisms: Friend and foe | NCERT
Which microorganisms reproduce only inside cells of host organism?
fungi
protozoa
algae
viruses
bacteria
Which diseases are caused by protozoa?
dysentery
influenza
cold
malaria
tuberculosis
Amoeba is a representative of:
Protozoa
Algae
Bacteria
Fungi
Which microorganisms may be multicellular?
fungi
bacteria
protozoa
algae
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
. . . . . into
. . . . . .
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
. . . . . 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 protozoa
a virus
a bacteria
a fungi
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?
65%
81%
78%
73%