Chapter 2 - Microogranisms: Friend and Foe MCQs
Question 1: One day, Ramu saw some colored cottony growth on the bread. He uses magnifying glass to observe the microorganisms. Which group of microorganism will he likely observe?
a) Fungi
b) Algae
c) Bacteria
d) Protozoa
Answer
Answer: a) Fungi
Question 2: Which of the following is not a fungi?
a) Bread Mould
b) Penicillium
c) Amoeba
d) Aspergillus
Answer
Answer: c) Amoeba
Question 3: Which of the following disease is caused by protozoa?
a) Malaria
b) Chicken pox
c) Flu
d) None of these
Answer
Answer: a) malaria
Question 4: What characteristic likely defines a pathogen?
a) They can spoil food and plastic.
b) They make soil fertile.
c) They can infect a human body.
d) They breakdown remains of dead organisms.
Answer
Answer: c) They can infect a human body.
Question 5: Which of the following is the smallest microbe?
a) Protozoa
b) Virus
c) Fungi
d) None of these
Answer
Answer: b) Virus
Question 6: Which of the following microbe can only reproduce inside the host cell?
a) Virus
b) Algae
c) Fungi
d) None of these
Answer
Answer: a) Virus
Question 7: Which option shows the correct example of diseases in plants or animals and their corresponding harmful agents?
a) Anthrax - Plant - Bacterium
b) Citrus canker - Animals - Bacterium
c) Cholera - Animals - Fungus
d) Rust of Wheat - Plants - Fungus
Answer
Answer: d) Rust of Wheat - Plants - Fungus
Question 8: Which option shows the name and function of preservatives used in jam and squashes?
a) Salt that stop the activity of microbes
b) Oil that makes the environment unsuitable for the survival of microbes
c) Both option a) and b)
d) Sodium benzoate that prevents the action of microbes
Answer
Answer: d) Sodium benzoate that prevents the action of microbes
Question 9: Which of the following statement is not true for microorganism?
a) Microorganisms are very small organisms which cannot be seen with the unaided eye. They can be seen only with a magnifying glass or microscope.
b) Microorganisms may be unicellular or multicellular
c) Microorganisms are found in all kinds of environment like ice cold climate, hot springs deserts, marshy lands etc. They are also found inside the bodies of other organisms.
d) All microorganism live in colonies.
Answer
Answer: d) All microorganism live in colonies.
Question 10: Viruses which affect bacteria are called
a) bacteriophages
b) bacilli
c) Both option a) and b)
d) None of these
Answer
Answer: a) bacteriophages
Question 11: Which of the following bacterium is useful for making curd?
a) Lactobacillus
b) Rhizobium
c) Chlamydomonas
d) Penicillium
Answer
Answer: a) Lactobacillus
Question 12: Who discovered the process of fermentation and name the year.
a) Louis Pasteur, 1857
b) Louis Robert, 1983
c) Robert Köch, 1900
d) None of these
Answer
Answer: a) Louis Pasteur, 1857
Question 13: Alcohol is produced with the help of
a) Carbon dioxide
b) Yeast
c) nitrogen
d) Helium
Answer
Answer: b) Yeast
Question 14: Which of the following is an/are antibiotic?
a) Streptomycin
b) Tetracycline
c) Erythromycin
d) All of these
Answer
Answer: d) All of these
Question 15: Who discovered the vaccine for small pox?
a) Louis Pasteur
b) Edward Jenner
c) Edward Woody
d) None of these
Answer
Answer: b) Edward Jenner
Question 16: Which bacteria is useful for converting plant and animal waste to usable form for plants?
a) Rhizobium
b) Spirogyra
c) Amoeba
d) None of the above
Answer
Answer: a) Rhizobium
Question 17: The process by which amount of nitrogen remains the same in the atmosphere is known as
a) Nitrogen Cycle
b) Water Cycle
c) Carbon Cycle
d) All of the above
Answer
Answer: a) Nitrogen Cycle
Question 18: Pathogens are also called
a) Germs
b) Antigen
c) Antibody
d) Carrier
Answer
Answer: a) Germs
Question 19: Spherical-shaped bacteria are called
a) bacilli
b) cocci
c) fungi
d) None of these
Answer
Answer: a) bacilli
Question 20: The process in which sugar in the food is transformed into alcohol and carbon dioxide by using microorganisms is known as
a) Fermentation
b) Glucose
c) Photosynthesis
d) All of these
Answer
Answer: a) Fermentation
Question 21: How much nitrogen is present in the atmosphere?
a) 78%
b) 90%
c) 78.5%
d)100%
Answer
Answer: a) 78%
Question 22: Penicillin was discovered by
a) Edward Jenner
b) Louis Pasteur
c) Alexander Fleming
d) None of the above
Answer
Answer: c) Alexander Fleming
Question 23: Mushroom belongs to the group of
a) algae
b) virus
c) fungi
d) All of these
Answer
Answer: c) fungi
Question 24: Find the odd one in the following.
a) Bread mould
b) Penicillium
c) Aspergillus
d) Paramecium
Answer
Answer: d) Paramecium
Question 25: Find the out one in the following.
a) Rhizobium
b) Lactobacillus
c) Blue-Green Alage
d) Chlamydomonas
Answer
Answer: d) Chlamydomonas
Question 26: Malaria is a disease caused by
a) Virus
b) Bacteria
c) Protozoa
d) Fungus
Answer
Answer: c) Protozoa
Question 27: The temperature at which milk is heated in order to preserve is ________
a) 70°
b) 80°
c) 110°
d) 65°
Answer
Answer: a) 70°
Question 28: The host for malaria causing protozoan is:
a) anapheles mosquito
b) dogs
c) rats
d) All the above
Answer
Answer: a) anapheles mosquito
Question 29: The bread or dosa dough rises because of the action of:
a) heat
b) cooling
c) growth of yeast cells
d) All of these
Answer
Answer: c) growth of yeast cells
Question 30: Which of the following lives alone:
a) bacteria
b) fungi
c) amoeba
d) All of the above
Answer
Answer: a) Amoeba
Question 31: Tuberculosis is caused by
a) Bacteria
b) Fungi
c) Protozoa
d) None of these
Answer
Answer: b) Cones are sensitive to bright light
Question 32: What is the mode of transmission for Polio?
a) Air
b) Water
c) Option a) and b)
d) None of these
Answer
Answer: c) Option a) and b)
Question 33: Hepatitis A is caused by?
a) Virus
b) Protozoa
c) Fungi
d) None of the above
Answer
Answer: a) Virus
Question 34: Which of the following statement is not true for useful microbes?
a) Microorganisms like bacteria decomposes organic waste into manure and increases the fertility of the soil.
b) Microorganisms help in fixing atmospheric nitrogen into nitrogen.
c) Microorganisms are used for making curd from milk for making cheese,
pickles, bread, cakes, pastries, alcohol, wine, vinegar etc.
d) Microorganisms are not useful for making medicines or vaccines.
Answer
Answer: d) Microorganisms are not useful for making medicines or vaccines.
Question 35: Which of the following is/are true for chemical methods of preservation of food?
a) Pickles can be preserved by using chemicals like salts and edible oils.
b) Jams and squashes can be preserved by using sodium benzoate, sodium meta bisuphate.
c) These chemicals are preservatives.
d) All of these
Answer
Answer: d) All of these
Question 36: Louis Pasteur discovered the vaccine for rabies in
a) 1886
b) 1884
c) 1885
d) None of these
Answer
Answer: c) 1885
Question 37:
Assertion (A): Microscope is used to see microbes.
Reason (R): Antony van Leeuwenhoek discovered the first microscope.
a) Both A and R are true and R is the correct explanation of A.
b) Both A and R are true but R is not the correct explanation of A.
c) A is true but R is false.
d) A is false but R is true.
Answer
Answer: b) Both A and R are true but R is not the correct explanation of A.
Question 38:
Assertion (A): The process of heating milk to about 70°C for 15 to 30 seconds and then
suddenly chilling it to prevent the growth of microbes is called
Pasteurization.
Reason (R): This process was discovered by Louis Pasteur.
a) Both A and R are true and R is the correct explanation of A.
b) Both A and R are true but R is not the correct explanation of A.
c) A is true but R is false.
d) A is false but R is true.
Answer
Answer: b) Both A and R are true but R is not the correct explanation of A.
Question 39:
Assertion (A): The bacterium called Lactobacillus reproduces in milk and helps to convert milk into curd.
Reason (R): Lactobacillus is a bacteria.
a) Both A and R are true and R is the correct explanation of A.
b) Both A and R are true but R is not the correct explanation of A.
c) A is true but R is false.
d) A is false but R is true.
Answer
Answer: b) Both A and R are true but R is not the correct explanation of A.
Question 40:
Assertion (A): Microorganisms only live alone.
Reason (R): Microorganisms cannot be seen with naked eye.
a) Both A and R are true and R is the correct explanation of A.
b) Both A and R are true but R is not the correct explanation of A.
c) A is true but R is false.
d) A is false but R is true.
Answer
Answer: d) A is false but R is true.
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