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Biology in Human Welfare — GK Questions with Answers

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6 questions
  1. What is the chief characteristic of mixed farming?
    1. growing cash crops and food crops together
    2. raising more than one crop together within a single field
    3. rearing animals and growing crops together
    4. none of these
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    Answer: (C) rearing animals and growing crops together

    In mixed farming, the farmer rears animals alongside growing crops — both form part of the same farming system.

  2. What is molasses, a byproduct of the sugar industry, used for?
    1. only as cattle feed
    2. producing ethanol and fertiliser
    3. only for making paper
    4. none of these
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    Answer: (B) producing ethanol and fertiliser

    Molasses is used to produce both ethanol and fertiliser, while bagasse from sugarcane is used to generate electricity.

  3. What can excessive use of nitrogenous fertilisers lead to?
    1. lower soil acidity
    2. higher soil acidity and nitrate leaching into groundwater
    3. only benefits for the soil
    4. none of these
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    Answer: (B) higher soil acidity and nitrate leaching into groundwater

    Excessive or inappropriate use can raise soil acidity and allow nitrate to leach down into the groundwater.

  4. What is a foreign particle that enters the body and triggers the immune system called?
    1. antibody
    2. antigen
    3. vaccine
    4. hormone
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    Answer: (B) antigen

    Any foreign particle, such as bacteria or a virus, that activates the immune system is called an antigen.

  5. When are Kharif crops typically sown?
    1. in cold, dry weather
    2. in warm, humid weather
    3. in the same weather all year
    4. none of these
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    Answer: (B) in warm, humid weather

    Kharif crops such as maize, bajra and rice are sown in warm, humid weather, and need dry weather while ripening.

  6. Which species is mainly reared as the silkworm in sericulture?
    1. Apis mellifera
    2. Bombyx mori
    3. Catla catla
    4. Gossypium hirsutum
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    Answer: (B) Bombyx mori

    Sericulture mainly rears the species Bombyx mori as the silkworm for producing silk.

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