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Biology & Human...

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  • Question 1
    1 / -0.25

     

    Treatment of wastewater is done by:

     

  • Question 2
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    Which of the following crops has been developed by genetic engineering in India?

     

  • Question 3
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    Which of the following is not correct regarding the primary treatment of wastewater?

     

  • Question 4
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    Which of the following is mainly produced by the activity of anaerobic bacteria on sewage?

     

  • Question 5
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    Secondary treatment of sewage is also called _________.

     

  • Question 6
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    High value of BOD shows?

     

  • Question 7
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    Which of the following is an aerobic nitrogen-fixing bacterium?

     

  • Question 8
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    The common nitrogen-fixer in paddy fields is _________.

     

  • Question 9
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    The most important of the symbiotic nitrogen-fixing bacteria which forms nodules on the roots of legume plants is _________.

     

  • Question 10
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    Which of the following organisms do no fix atmospheric nitrogen?

     

  • Question 11
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    Organisms called Methanogens are most abundant in a _________.

     

  • Question 12
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    Baculoviruses are pathogens that:

     

  • Question 13
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    Assertion: Biofertilizers are organisms that enrich the nutrient quality of the soil.
    Reason: Organic farming is the farming technique in which no chemical is used as fertilizers or insecticides.

     

  • Question 14
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    The main source of bio-fertilizers is/are:

     

  • Question 15
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    In which of the following microbes are not used extensively?
    I. Converting milk into curd.
    II. Making cheese of different flavour and taste.
    III. Production of anti-viral drugs.
    IV. Production of antibiotics.
    V. As bio-fertilizers.
    VI. Production of inorganic fertilizers.

     

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