Practice MCQs for Class 8 Science Chapter 02 Microorganisms Friend or Foe
Review structured MCQ sets for Class 8 Science Chapter 02 Microorganisms Friend or Foe. Built according to official CBSE guidelines, these downloadable questions support daily revision and core concept reinforcement.
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Access the complete set of multiple-choice questions for Chapter 02 Microorganisms Friend or Foe below. This focused format allows students to isolate specific topics for thorough review and uninterrupted practice alongside official CBSE textbooks.
Question. Diseases like polio and chicken pox are caused by _______
a) Bacteria
b) Fungi
c) Virus
d) Worms
Answer: C
Question. Examples of Multicellular Microorganism are
a) Algae, Bacteria
b) Bacteria and Fungi
c) Bacteria and Viruses
d) Algae and Fungi
Answer: D
Question. 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
Question. A common preservative used in jam and pickles is
a) Sodium benzoate
b) Nitric acid
c) Sodium Chloride
d) Copper Sulphate
Answer: A
Question. 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
Question. Lactobacillus is commonly found in
a) Cake
b) Curd
c) Bread
d) All of the above
Answer: B
Question. 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
Question. 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
Question. 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
Question. The microbe for Malaria is carried by
a) Male Anopheles mosquito
b) Female Anopheles Mosquito
c) Male Aedes mosquito
d) Female Aedes mosquito
Answer: C
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
Free study material for Science
Multiple Choice Questions (MCQs) for Class 8 Science Chapter 02 Microorganisms Friend or Foe
Chapter MCQs with Answers for Class 8 Science
Review structured objective questions for Class 8 Science Chapter 02 Microorganisms Friend or Foe. Built according to official CBSE guidelines, these MCQ sets support daily revision and core concept reinforcement.
Expert Practice Material for Class 8 Science
Each question includes structured solution keys mapped directly to standard CBSE textbooks, helping students evaluate their reasoning and correct mistakes early in their revision.
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FAQs
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By solving our CBSE Class 8 Science Microorganisms Friend or Foe MCQs, Class 8 students can improve their accuracy and speed which is important as objective questions provide a chance to secure 100% marks in the Science.
Yes, Science MCQs for Class 8 have answer key and brief explanations to help students understand logic behind the correct option as its important for 2026 competency-focused CBSE exams.
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