Chapter-wise MCQ Questions

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Question-1. What process takes place when yeast is added to grape juice and left for a week?

  1. Decomposition
  2. Fermentation
  3. Distillation
  4. Oxidation
Answer-1

Question-2. Vaccine for small pox is discorvered by

  1. Edward jenner
  2. Louis pasteur
  3. Alexander fleming
  4. John mendal
Answer-2

Question-3. The process of conversion of sugar into alcohol by yeast is called

  1. Fermentation
  2. Pasteurisation
  3. Alcoholism
  4. All of the above
Answer-3

Question-4. Mushroom belongs to

  1. Fungi
  2. Algae
  3. Virus
  4. None of the options
Answer-4

Question-5. Penicillium is a

  1. Fungus
  2. Algae
  3. Bacteria
  4. Yeast
Answer-5

Question-6. What helps in the rise of bread or dosa dough?

  1. Heat
  2. Grinding
  3. Growth of yeast cells
  4. Low pressure
Answer-6

Question-7. Rhizobium becteria

  1. Help in nitrogen fixation
  2. Help in digestion
  3. Cause diseases
  4. All of these
Answer-7

Question-8. Scientist who discovered fermentation is

  1. Louis pasteur
  2. Alexander fleming
  3. John mendal
  4. Edward jenner
Answer-8

Question-9. The microbe for Malaria is carried by

  1. Male Anopheles mosquito
  2. Female Anopheles Mosquito
  3. Male Aedes mosquito
  4. Female Aedes mosquito
Answer-9

Question-10. Deliberately injecting weak microbes into a healthy body and producing antibodies to fight against strong microbes is called

  1. Medication
  2. Antibiotics
  3. Vaccination
  4. All of the above
Answer-10

Question-11. Microorganisms are

  1. Multi-cellular
  2. Unicellular
  3. Unicellular and multi-cellular
  4. None of the options
Answer-11

Question-12. Virus reproduce

  1. only outside the cells of the host organisms
  2. only inside the cells of the host organisms
  3. both inside and outside the cells of the host organisms
  4. none of these
Answer-12

Question-13. . The pores in the bread is due to gas bubbles of

  1. Oxygen
  2. Nitrogen di oxide
  3. Nitrogen
  4. Carbon di oxide
Answer-13

Question-14. Malaria is spread by

  1. plasmodium
  2. female anapheles mosquito
  3. male anapheles mosquito
  4. none of these
Answer-14

Question-15. Malaria Is caused by

  1. Protozoa
  2. Virus
  3. Algae
  4. Bacteria
Answer-15

Question-16. A common preservative used in jam and pickles is

  1. Sodium benzoate
  2. Nitric acid
  3. Sodium Chloride
  4. Copper Sulphate
Answer-16

Question-17. A plant disease called citrus canker is caused by a

  1. Virus
  2. Protozoa
  3. Bacteria
  4. Fungi
Answer-17

Question-18. Amount of nitrogen in the atmosohere is

  1. 0.78
  2. 0.58
  3. 0.68
  4. 0.88
Answer-18

Question-19. In Pasteurisation the milk is heated to about

  1. 100°C
  2. 50°C
  3. 70°C
  4. 110°C
Answer-19

Question-20. Spyrogyra is

  1. A fungi
  2. An algae
  3. A protozoa
  4. A bacteria
Answer-20

Question-21. Scientist who discovered fermentation is

  1. Alexander Fleming
  2. Louis Pasteur
  3. John Mendal
  4. Edward Jenne
Answer-21

Question-22. Examples of Multicellular Microorganism are

  1. Algae, Bacteria
  2. Bacteria and Fungi
  3. Bacteria and Viruses
  4. Algae and Fungi
Answer-22

Question-23. Which of the following enzymes is secreted by bacteria that can digest cellulose?

  1. Amylase
  2. Cellulase
  3. Lipase
  4. Protease
Answer-23

Question-24. Some medicines obtained from micro-organisms are applied to kill or stop the growth of disease-causing microorganisms. Such medicines are called ______.

  1. Antibodies
  2. Antibiotics
  3. Antiseptics
  4. All of the above
Answer-24

Question-25. Rhizobium found in root nodules of leguminous roots is an

  1. Atmospheric Carbon fixer
  2. Atmospheric Oxygen fixer
  3. Atmospheric Nitrogen fixer
  4. All of the above
Answer-25

Question-26. Diseases like polio and chicken pox are caused by

  1. Bacteria
  2. Fungi
  3. Virus
  4. Worms
Answer-26

Question-27. Yeast is not used in the preparation of

  1. bread
  2. alcohol
  3. dhokla
  4. antibiotic
Answer-27

Question-28. Lactobacillus is commonly found in

  1. Cake
  2. Curd
  3. Bread
  4. All of the above
Answer-28



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