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NCERT Class VIII Science Solutions: Chapter 2 - Microorganisms: Friend and Foe Part 1
MULTIPLE CHOICE QUESTIONS
Question 1:
Which of the following reproduces only inside a host cell?
- Bacteria
- Virus
- Amoeba
- Fungus.
Answer: B
Question 2:
A disease in human beings caused by virus is ________.
- Typhoid
- Influenza
- Dysentry
- Cholera
Answer: B
Question 3:
Pathogenic micro-organisms present in host cells are killed by medicines called
- Pain killer
- Antibodies
- Antibiotics
- Vaccines
Answer: C
Question 4:
The two micro-organisms which live in symbiotic association in lichens are
- Fungus and protozoa
- Alga and bacteria
- Bacteria and protozoa
- Algae and fungus
Answer: D
Question 5:
The gas released during the preparation of bread is
- Oxygen
- Carbon dioxide
- Nitrogen
- Sulphur dioxide
Answer: B
Question 6:
The disease caused by a protozoan and spread by an insect is ________.
- Dengue
- Malaria
- Polio
- Measles
Answer: B
Question 7:
Paheli dug two pits, A and B, in her garden. In pit A, she put a polytene bag packed with some agricultural waste. In pit B, she dumped the same kind of waste but without packing it in a polythene bag. She then covered both the pits with soil. What did she observe after a month?
- Waste in pit A degraded faster than that in pit B.
- Waste in pit B degraded faster than that in pit A.
- Waste in both pits degraded almost equally.
- Waste in both pits did not degrade at all.
Answer: B