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AQA GCSE - Unit 3 (P3,B3,C3) New specification papers. Watch

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    Can someone explain the motor effect please?? Been stuck on it for ages!
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    (Original post by Captain Anonymous)
    revision game anyone?
    What is the motor effect??
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    I'm not actually to keen on this myself
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    I dont understand it, its so confusing
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    (Original post by KimSmith1234)
    What is the motor effect??
    when a current is passed through a wire and the wire is not parallel to the lines of magnetic field then a force will be exerted by the magnetic field to the wire. btw the wire has to be in a magnetic field
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    How is drinking water treated? you know like the process?
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    (Original post by Obliviate)
    Describe the processes that prevent glucose being extracted in the urine :>

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    After the blood is filtered, selective reabsorption takes place. the glucose is then reabsorbed into the blood by active transport which uses energy release by respiration in the mitochondria.
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    (Original post by Blake-inator)
    How is drinking water treated? you know like the process?
    the water is filtered to remove solids. Secondly, chlorine is added to kill bacteria. But chlorine levels are carefully controlled as chlorine can form poisonous compounds.
    For the longer version:
    water from a resevoir is passed through metal bars which picks up twigs and other large materials. Then the water is left to settle in a settlement tank and soil settles. Then aluminuim sulfate and lime are added so dirt clumps together and settles. Then it is passed through fine sand to remove any particles. Then chlorine is added to kill bacteria. Then the levels of pH are monitored.
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    (Original post by Blake-inator)
    WHat are the 4 problems with deforestation?
    1) reduces biodiversity
    2) destroys habitats and food sources
    3) land is cleared for rice and cattle farming which releases methane
    4) wood is burned or decay by microogranisms to release carbon dioxide
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    (Original post by Captain Anonymous)
    If your talking about the Speciment - it will be around 96UMS
    yes!
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    (Original post by mh97)
    1) reduces biodiversity
    2) destroys habitats and food sources
    3) land is cleared for rice and cattle farming which releases methane
    4) wood is burned or decay by microogranisms to release carbon dioxide
    Sorry just to throw something in, you could also say less trees results in less photosynthesis, resulting in less CO2 being taken in from the atmosphere

    (if that's correct....)
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    Also, (if Cap Anonymous will allow this) Here is a question I made up:

    Evaluate the benefits and disadvantages of Intensive Farming.
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    (Original post by tohaaaa)
    Also, (if Cap Anonymous will allow this) Here is a question I made up:

    Evaluate the benefits and disadvantages of Intensive Farming.
    I hardly remember this, but here goes

    Advantages: Less money used on food to feed animals as they don't move around as much if farmed intensively, (e.g kept in cages)

    Better yield produced because they waste less energy on movement?

    Disadvantages:

    Spread of illness throughout the animals because they are kept so close together

    This leads to giving them antibiotics, which can end up in humans when they eat meat, which can lead to MRSA developing.

    Hmm it's Unethical maybe?
    :confused: Definitely need to revise b3 again soon
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    (Original post by sneakbo2)
    I hardly remember this, but here goes

    Advantages: Less money used on food to feed animals as they don't move around as much if farmed intensively, (e.g kept in cages)

    Better yield produced because they waste less energy on movement?

    Disadvantages:

    Spread of illness throughout the animals because they are kept so close together

    This leads to giving them antibiotics, which can end up in humans when they eat meat, which can lead to MRSA developing.

    Hmm it's Unethical maybe?
    :confused: Definitely need to revise b3 again soon
    You've made a range of good points there
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    Revision game? anyone?
    • Thread Starter
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    (Original post by Captain Anonymous)
    Revision game? anyone?
    Let's go!

    What are the jobs of Phloem Tubes and Xylem tubes?
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    (Original post by Efemena15)
    Let's go!

    What are the jobs of Phloem Tubes and Xylem tubes?
    They are the transport systems of the plant, transporting mineral ions water and food. Phloem carries food if I remember and Xylem mineral ions and water.
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    (Original post by Efemena15)
    Let's go!

    What are the jobs of Phloem Tubes and Xylem tubes?
    Describe the process that occurs in a biogas generator. ( 3marks)
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    (Original post by Denmark11111)
    Describe the process that occurs in a biogas generator. ( 3marks)
    waste material which contains carbohydrates is put in a biogas generator. Bacteria breakdown the carbohydrates by respiring anaerobically and anaerobic fermentation occurs. Methane and other substances are produced.
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    (Original post by Denmark11111)
    Describe the process that occurs in a biogas generator. ( 3marks)

    I'll try this one:

    Firstly, waste material is placed into an airtight container and closed, bacteria is then added which use anaerobic respiration to break down the waste materials to from biogas, the gas is then tapped off from a separate pipe.
 
 
 
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