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Grade 11 Life Sciences Microorganisms

Quiz by Jo

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45 questions
Show answers
  • Q1
    How long ago did microbes appear on Earth?
    2 billion years ago
    2.5 million years ago
    3 million years ago
    3.5 billion years ago
    30s
  • Q2
    What was the name of the scientist who discovered that microbes can fix Nitrogen?
    Louis Pasteur
    Martinus Beijerinck
    Antonie van Leeuwenhoek
    Alexander Fleming
    30s
  • Q3
    Which of the following reasons most correctly describes why is nitrogen fixation so important?
    Nitrogen is a main element that makes up human brain cells.
    Nitrogen is a main element that makes up all human cells and biochemistry.
    Nitrogen is the best element to improve sleep patterns.
    Nitrogen makes food taste much better.
    30s
  • Q4
    How do humans obtain Nitrogen?
    By sleeping at least 7 hours each night
    Through the air that they breathe in
    Through the food that they eat
    Through the water that they drink
    30s
  • Q5
    What percentage of the atmosphere is made up of nitrogen?
    80%
    50%
    96%
    10%
    30s
  • Q6
    What is the reason why most plants cannot fix nitrogen?
    Nitrogen cannot dissolve in water
    Nitrogen is toxic to plants in its natural form
    Nitrogen is a heavy element that cannot move up a plant easily
    Nitrogen is too stable to be broken down easily
    30s
  • Q7
    Which group of microorganisms fixes nitrogen in the soil?
    Protista
    Fungi
    Viruses
    Bacteria
    30s
  • Q8
    What elements are added to Nitrogen during Nitrogen fixation to form compounds that plants can make use of?
    Oxygen & Hydrogen
    Carbon & Hydrogen
    Carbon & Fluorine
    Oxygen & Carbon
    30s
  • Q9
    With which types of plants have some microorganisms developed a symbiotic relationship?
    Tomato and Potato Plants
    Pea & Bean Plants
    Rose Plants
    Carrot Plants
    30s
  • Q10
    Where in legumes are microorganisms found?
    In seeds
    In leaves
    In root nodules
    In stems
    30s
  • Q11
    Which enzyme is used to combine hydrogen and nitrogen?
    Helicase
    Nitrogenase
    Hydrogenase
    Peptidase
    30s
  • Q12
    Fritz Haber discovered a way to fix nitrogen chemically. What was the product of this process?
    Nitrate
    Nitrogen
    Ammonia
    Nitrite
    30s
  • Q13
    Which of the following is a benefit of the Haber process?
    It allows Nitrogen to be fixed at different temperatures
    Fertilisers can be produced on an industrial scale
    It tells us a lot about Nitrogen fixation
    It is a very cheap process
    30s
  • Q14
    What is a disadvantage of inorganic fertilizers?
    They stop the growth of naturally-occurring plants
    They attract insect pests
    They can be bad for the environment
    They are extremely expensive
    30s
  • Q15
    How can farmers introduce more nitrogen to nitrogen-poor soils?
    Plant tomatoes and carrots in the soil
    Spray nitrogen gas over the nitrogen-poor soil
    Use pesticides that kill insects which consume nitrogen
    Plant legumes in the area and then plough them into the soil
    30s

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