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Microbes in Human Welfare

Description: All about microbes
Number of Questions: 15
Created by:
Tags: Microbes Microbes in Household Products Household Production, Sewage Treatment and Industrial Use Microbes in Production of Biogas Microbes in Industrial Products Production of Drugs and Vaccines Microbes in Sewage Treatment Microbial Utilisation Microbes in HumanWelfare Microbes in Plants
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Cow dung used for biogas production is rich in

  1. Rhizobium

  2. Methanobacterium

  3. Acetobacter aceti

  4. Lactobacillus

  5. All of the above

Show answer
Correct Option: B
Explanation:

Yes, it is the correct answer. 

Which of the following statements is/are true regarding the microbe Lactobacillus?

(a) It grows in milk and converts it into cheese. (b) It grows in curd. (c) It is commonly called lactic acid bacterium. (d) LAB produces acids that coagulate and partially digest the milk proteins. (e) It improves the nutritional quality of the milk.

  1. Both (a) and (b)

  2. Only (c)

  3. (b), (c) and (d)

  4. (c), (d) and (e)

  5. Both (b) and (e)

Show answer
Correct Option: D
Explanation:

All the three statements are true. Hence, this option is correct.

Biofertilisers are organisms that enrich the nutrient quality of the soil. Which of the following microbes are used as biofertilisers?

  1. Bacteria

  2. Cyanobacteria

  3. Algae

  4. All of the above

Show answer
Correct Option: D
Explanation:

Yes, it is the correct answer. All of these microorganisms (bacteria, algae, etc) are considered beneficial for agriculture and are used as biofertilisers. Fungus also plays a considerable role in the decomposition of organic materials and enrichment of compost.

Which of the following statements is/are false regarding methanogens (Methanobacteria)?

(a) They grow anaerobically. (b) These bacteria are also present in the rumen of cattle. (c) They help produce biogas.

  1. Only (a)

  2. Only (b)

  3. Only (c)

  4. None of these

  5. Both (a) and (b)

Show answer
Correct Option: D
Explanation:

 Methanogens are bacteria that produce methane gas. As a result of their metabolism, they can be used as sources of biogas. 

Treatment of waste water is done by heterotrophic microbes naturally present in the sewage. These microbes are

  1. the bacteria that use organic compounds as a source of energy and carbon

  2. the bacteria that are able to synthesise their own organic food from inorganic substances

  3. the bacteria that live in a mutually beneficial association with other organisms

  4. the bacteria that manufacture organic compounds from inorganic raw materials utilising energy liberated from the oxidation of inorganic substances

  5. None of these

Show answer
Correct Option: A
Explanation:

Yes, it is the correct answer. 

The dough which is used for making bread, is fermented by using baker’s yeast. What is the scientific name of this yeast?

  1. Staphylococcus

  2. Penicillium notatum

  3. Aspergillus niger

  4. Saccharomyces cerevisiae

  5. None of these

Show answer
Correct Option: D
Explanation:

It is the correct answer.

Which of the following bacteria is used to remove clots in heart patients?

  1. Streptococci

  2. Lactobacillus

  3. Methanobacterium

  4. Anabaena

  5. Aspergillus

Show answer
Correct Option: A
Explanation:

Yes, it is the correct answer. It is used to remove clots from the blood vessels of patients.

Match the following:

1 Lipase a In bottled juices
2 Pectinase b To remove clots
3 Streptokinase c In laundry detergents

  1. 1 - a, 2 - c, 3 - b

  2. 1 - b, 2 - c, 3 - a

  3. 1 - c, 2 - a, 3 - b

  4. 1 - c, 2 - b, 3 - a

  5. 1 - b, 2 - a, 3 - c

Show answer
Correct Option: C
Explanation:

The correct match is 1 - c, 2 - a, 3 - b.

The large holes in ‘Swiss cheese’ are due to production of a large amount of CO2 by

  1. a bacterium named Clostridium butylicum

  2. a bacterium named Propionibacterium sharmanii

  3. a yeast named Saccharomyces cerevisiae

  4. a fungus called Aspegillus niger

  5. a bacterium named Acetobacter aceti

Show answer
Correct Option: B
Explanation:

Yes, it is correct. The large holes in ‘Swiss cheese’ are due to the production of a large amount of CO2 by a bacterium named Propionibacterium sharmanii.

Which of the following is a traditional drink in some parts of southern India that is made by fermenting sap from palms?

  1. Lassi

  2. Toddy

  3. Green tea

  4. Panna

  5. None of these

Show answer
Correct Option: B
Explanation:

Yes, it is the correct answer. “Toddy”, a traditional drink of some parts of southern India, is made by fermenting sap from palms.

Which of the following substances are produced by microbes to kill other disease causing microbes?

  1. Enzymes

  2. Antibiotics

  3. Bioactive molecules

  4. Chemicals

  5. None of these

Show answer
Correct Option: B
Explanation:

Yes, it is the correct answer. Antibiotics are chemical substances which are produced by some microbes and can kill or retard the growth of other disease-causing microbes. For example, pencillin.

Lady bird controls the population of _______ by eating them.

  1. mosquitoes

  2. small reptiles

  3. plant pathogens

  4. aphids

  5. none of these

Show answer
Correct Option: D
Explanation:

Yes, it is the correct answer. Ladybugs are so popular in terms of aphid control because they eat nearly all aphids. Adult ladybugs can eat up to 1000 aphids a day and as larva, about half as many.

In the secondary treatment of sewage, during digestion, bacteria produce a mixture of gases. Which of the following gases is/are not produced?

(a) methane (b) hydrogen sulphide (c) nitrous oxide (d) carbon dioxide (e) oxygen

  1. Only a and b

  2. Only c

  3. Only c and e

  4. Only b and d

  5. Only d and e

Show answer
Correct Option: C
Explanation:

Yes, it is the correct answer. In the secondary treatment of sewage, during digestion, bacteria produce a mixture of gases. But from the above given gases, nitrous oxide and oxygen are not produced.

Which of the following is/are not a free living cyanobacteria?

(a) Nostoc (b) Oscillatoria (c) Anaebana (d) Blue green algae

  1. Only a

  2. Only b

  3. Only c

  4. Only a and d

  5. Only b and d

Show answer
Correct Option: C
Explanation:

Yes, it is the correct answer. Anaebana is not a free living cyanobacteria. Anabaena Azollae maintains a mutually beneficial symbiotic relationship.

Match the following microbes and their symbiont ||||| |---|---|---|---| |1|Micorrhiza|a|Root system of genus glomus| |2|Rhizobium|b|Azolla| |3|Anabaena|c|Roots of leguminous plants|

  1. 1 - a, 2 - b, 3 - c

  2. 1 - a, 2 - c, 3 - b

  3. 1 - c, 2 - b, 3 - a

  4. 1 - c, 2 - a, 3 - b

  5. 1 - b, 2 - c, 3 - a

Show answer
Correct Option: B
Explanation:

Yes, it is the correct answer, as all are correctly matched.

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