MCQ Questions for Class 8 Science Chapter 2 : NCERT CBSE RBSE other Board MCQ Questions for Class 8 Science Chapter 2 Microorganisms: Friend and Foe with Answers Pdf free download. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern.
MCQ Questions for Class 8 Science Chapter 2 Microorganisms: Friend and Foe with Answers
1. Diseases like polio and chicken pox are caused by _______
a) Bacteria
b) Fungi
c) Virus
d) Worms
Answer: (c)
2. Examples of Multicellular Microorganism are
a) Algae, Bacteria
b) Bacteria and Fungi
c) Bacteria and Viruses
d) Algae and Fungi
Answer: (d)
3. Some medicines obtained from micro-organisms are applied to kill or stop the growth of disease-causing microorganisms. Such medicines are called ______.
a) Antibodies
b) Antibiotics
c) Antiseptics
d) All of the above
Answer: (b)
4. A common preservative used in jam and pickles is
a) Sodium benzoate
b) Nitric acid
c) Sodium Chloride
d) Copper Sulphate
Answer: (a)
5. Rhizobium found in root nodules of leguminous roots is an
a) Atmospheric Carbon fixer
b) Atmospheric Oxygen fixer
c) Atmospheric Nitrogen fixer
d) All of the above
Answer: (c)
6. Lactobacillus is commonly found in
a) Cake
b) Curd
c) Bread
d) All of the above
Answer: (b)
7. The process of conversion of sugar into alcohol by yeast is called
a) Fermentation
b) Pasteurisation
c) Alcoholism
d) All of the above
Answer: (a)
8. The pores in the bread is due to gas bubbles of
a) Oxygen
b) Nitrogen di oxide
c) Nitrogen
d) Carbon di oxide
Answer: (d)
9. Deliberately injecting weak microbes into a healthy body and producing antibodies to fight against strong microbes is called _______
a) Medication
b) Antibiotics
c) Vaccination
d) All of the above
Answer: (c)
10. The microbe for Malaria is carried by
a) Male Anopheles mosquito
b) Female Anopheles Mosquito
c) Male Aedes mosquito
d) Female Aedes mosquito
Answer: (b)
Question 11.
Which bacteria helps in settling of curd?
(a) Rhizobium
(b) Lactobacillus
(c) Vibriocholarae
(d) Bacillus
Answer: (b) Lactobacillus
Question 12.
Which microorganism causes AIDS?
(a) A protozoa
(b) A bacteria
(c) A virus
(d) An algae
Answer: (c) A virus
Question 13.
Which of the following disease is spread due to bacteria?
(a) Tuberculosis
(b) Measles
(c) Chicken pox
(d) Polio
Answer: (a) Tuberculosis
Question 14.
Which of the following is not used as food preservatives?
(a) Salt
(b) Sugar
(c) Vinegar
(d) Methane
Answer: (d) Methane
Question 15.
The process by which amount of nitrogen remains the same in the atmosphere is known as
(a) fermentation
(b) carbon cycle
(c) nitrogen cycle
(d) photosynthesis
Answer: (c) nitrogen cycle
Match the following items given in Column ‘A with that in Column ‘B’:
| Column A | Column B |
| Tuberculosis | Edward Jenner |
| Chicken pox | Fleming |
| Malaria | L. Pasteur |
| Rust of wheat | HIV |
| Pasteurization | Fungi |
| Antibiotic | Virus |
| Vaccination | Bacteria |
| AIDS | Protozoa |
Answer:
| Column A | Column B |
| Tuberculosis | Bacteria |
| Chicken pox | Virus |
| Malaria | Protozoa |
| Rust of wheat | Fungi |
| Pasteurization | L. Pasteur |
| Antibiotic | Fleming |
| Vaccination | Edward Jenner |
| AIDS | HIV |
