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Microorganisms ...

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  • Question 1
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    Use the following information to answer the next question.

    _____i_____ are weakened or dead microorganisms which, when injected into the body of a healthy person, protect the person from disease-causing microorganisms by initiating the production of ____ii______.

    The information in which alternative completes the given statement?

  • Question 2
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    Vaccines are not available for which of the following diseases?

  • Question 3
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    Blue-green algae increase the fertility of soil. Which plant nutrient is added to soil by blue-green algae?

  • Question 4
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    Use the following information to answer the next question.

    Diseases that can spread from an infected person to a healthy person are known as communicable diseases.

    Which of the following diseases is communicable?

  • Question 5
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    Use the following information to answer the next question.

    Aditi labelled four pots as I, II, III, and IV. She placed vegetable peels, broken glasses, plastic bags, and plastic toys in pots I to IV respectively. She covered these pots with soil and left them untouched for two weeks.

    The contents of which pot will be decomposed by the microorganisms present in soil?

  • Question 6
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    Which of the following diseases is not caused by viruses?

  • Question 7
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    Use the following information to answer the next question.

    Carriers are organisms which carry disease-causing microorganisms on or in their body.

    Which organism is the carrier of dengue virus?

  • Question 8
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    Use the following information to answer the next question.

    Communicable diseases are diseases that can be transferred from an infected person to a healthy person through air or water.

    Which of the following diseases is transmitted through air?

  • Question 9
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    Which of the following diseases is caused by bacteria?

  • Question 10
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    Malaria occurs because of protozoan infection. Which of the following actions is a preventive measure for controlling the occurrence of malaria?

  • Question 11
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    Which of the following diseases occurs because of the consumption of contaminated water?

  • Question 12
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    Which organism causes the foot and mouth disease in cattle?

  • Question 13
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    Diseases that are transmitted through air cannot be prevented by

  • Question 14
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    Use the following information to answer the next question.

    Common salt is used for preserving _____i_____ and ____ii_____ for a long period of time.

    The information in which alternative completes the given statement?

  • Question 15
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    Use the following information to answer the next question.

    Citrus canker is a plant disease that occurs because of _____i_____ infection, while rust of wheat is a plant disease that occurs because of _____ii_____ infection.

    The information in which alternative completes the given statement?

  • Question 16
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    Use the following information to answer the next question.

    Plants are incapable of taking up nitrogen directly from the atmosphere.

    Which of the following organisms converts atmospheric nitrogen and makes it available to plants into the soluble form?

  • Question 17
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    Use the following information to answer the next question.

    _____i_______ prevents the spoilage of milk. Vegetables are treated with ____ii______ to preserve them from the attacks of microbes.

    The information in which alternative completes the given statements?

  • Question 18
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    Which of the following organisms are not classified as microorganisms?

  • Question 19
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    Use the following information to answer the next question.

    The nitrogenous wastes produced by the dead remains of plants and animals are reconverted into nitrogen compounds, which can again be used by plants.

    Which two organisms convert nitrogenous wastes into nitrogen compounds?

  • Question 20
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    Use the following information to answer the next question.

    Roma takes a small amount of yeast and kneads it along with flour to form dough. She keeps the dough for two hours. She later observes that the dough increases in volume.

    The volume of dough increases because of the production of which substance by yeast?

  • Question 21
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    Lactobacillus, which is a friendly microorganism, is used in the preparation of which of the following substances?

  • Question 22
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    Use the following information to answer the next question.

    Microorganisms are used for producing medicines called antibiotics, which reduce the growth or kill other microorganisms.

    Which two microorganisms are used in the preparation of antibiotics?

  • Question 23
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    Use the following information to answer the next question.

    Yeast is commercially used for the preparation of alcohol and ____i____ by the process of _____ii______.

    The information in which alternative completes the given statement?

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