CBSE Class 8 Science Microorganisms Friend or Foe MCQs

Question: Microorganisms are
a) Multi-cellular
b) Unicellular
c) Unicellular and multi-cellular
d) None of the options

Answer: A

Question: Penicillium is a
a) Fungus
b) Algae
c) Bacteria
d) Yeast

Answer: A

Question: Malaria Is caused by
a) Protozoa
b) Virus
c) Algae
d) Bacteria

Answer: A

Question: Rhizobium becteria
a) Help in nitrogen fixation
b) Help in digestion
c) Cause diseases
d) All of these

Answer: B

Question: Scientist who discovered fermentation is
a) Louis pasteur
b) Alexander fleming
c) John mendal
d) Edward jenner

Answer: A

Question: Amoeba belongs to
a) Protozoa
b) Algae
c) Fungi
d) Virus

Answer: A

Question: Mushroom belongs to
a) Fungi
b) Algae
c) Virus
d) None of the options

Answer: C

Question: Amount of nitrogen in the atmosohere is
a) 0.78
b) 0.58
c) 0.68
d) 0.88

Answer: A

Question: Vaccine for small pox is discorvered by
a) Edward jenner
b) Louis pasteur
c) Alexander fleming
d) John mendal

Answer: A

Question: Spyrogyra is
a) A fungi
b) An algae
c) A protozoa
d) A bacteria

Answer: A

Question. In Pasteurisation the milk is heated to about:
(a) 100°C
(b) 50°C
(c) 70°C
(d) 110°C

Answer : C

Question. Scientist who discovered fermentation is
(a) Alexander Fleming
(b) Louis Pasteur
(c) John Mendal
(d) Edward Jenne

Answer : B

Question. What helps in the rise of bread or dosa dough?
(a) Heat
(b) Grinding
(c) Growth of yeast cells
(d) Low pressure

Answer : C

Question. Yeast is not used in the preparation of :
(a) bread
(b) alcohol
(c) dhokla
(d) antibiotic

Answer : D

Question. Which of the following enzymes is secreted by bacteria that can digest cellulose?
(a) Amylase
(b) Cellulase
(c) Lipase
(d) Protease

Answer : B

Question. Examples of Multicellular Microorganism are
(a) Algae, Bacteria
(b) Bacteria and Fungi
(c) Bacteria and Viruses
(d) Algae and Fungi

Answer : D

Question. Virus reproduce:
(a) only outside the cells of the host organisms
(b) only inside the cells of the host organisms
(c) both inside and outside the cells of the host organisms
(d) none of these

Answer : B

Question. A plant disease called citrus canker is caused by a _________ .
(a) Virus
(b) Protozoa
(c) Bacteria
(d) Fungi

Answer : C

Question. What process takes place when yeast is added to grape juice and left for a week?
(a) Decomposition
(b) Fermentation
(c) Distillation
(d) Oxidation

Answer : B

Question. Malaria is spread by:
(a) plasmodium
(b) female anapheles mosquito
(c) male anapheles mosquito
(d) none of these

Answer : B