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    (Original post by NatashaG)
    Question and answer guys? if anyone's up for it :P


    Explain how the elbow joint acting as a pivot is an advantage (in terms of arm movement)?
    Let me finish B4 properly now! 2 more pages :')

    How are plant adaptations also a disadvantage?
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    What's an alternative to using pesticides? Name and advantage and disadvantage of it.
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    (Original post by andersson)
    What's an alternative to using pesticides? Name and advantage and disadvantage of it.
    Biological Control:
    No chemicals, less pollution
    Might not eat pest, or eat the useful species
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    (Original post by L'Evil Fish)
    Biological Control:
    No chemicals, less pollution
    Might not eat pest, or eat the useful species
    Right.
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    (Original post by L'Evil Fish)
    Let me finish B4 properly now! 2 more pages :')

    How are plant adaptations also a disadvantage?
    Broad leaves for more sunlight - Increased rate of transpiration.

    Any others?
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    (Original post by andersson)
    Broad leaves for more sunlight - Increased rate of transpiration.

    Any others?
    Loads more

    Mention stomata?
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    (Original post by L'Evil Fish)
    Loads more

    Mention stomata?
    Oh, having stomata for gas exchange means water can evaporate out at an increased rate.

    I guess you could say leaves being thin for more light reaching chloroplasts also means it heats up more easily and more water will evaporate.

    What are the rest?
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    (Original post by andersson)
    Oh, having stomata for gas exchange means water can evaporate out at an increased rate.

    I guess you could say leaves being thin for more light reaching chloroplasts also means it heats up more easily and more water will evaporate.

    What are the rest?
    I guess that's it actually so not loads more :teehee:
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    (Original post by L'Evil Fish)
    I guess that's it actually so not loads more :teehee:
    Haha it's fine.

    Alright, how do detritivores help decomposers? Give an example of a detritivore.
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    (Original post by andersson)
    Haha it's fine.

    Alright, how do detritivores help decomposers? Give an example of a detritivore.
    Eg earthworm

    They break waste down into smaller particles, increasing surface area for decomposers to act on. Speeds up decay.

    Explain the cardiac cycle.
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    (Original post by L'Evil Fish)
    Eg earthworm

    They break waste down into smaller particles, increasing surface area for decomposers to act on. Speeds up decay.

    Explain the cardiac cycle.
    1) The two atria fill up with blood. Atria-ventricular and semilunar valves are closed.

    2) Atria-ventricular valves open and the atria contract, forcing blood into the two ventricles. The semilunar valves are still closed.

    3) Semilunar valves open, the ventricles contract forcing the blood up to the lungs through the pulmonary artery and through to the rest of the body through the aorta.

    Explain how electric impulses play a part in the cardiac cycle.
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    (Original post by andersson)
    1) The two atria fill up with blood. Atria-ventricular and semilunar valves are closed.

    2) Atria-ventricular valves open and the atria contract, forcing blood into the two ventricles. The semilunar valves are still closed.

    3) Semilunar valves open, the ventricles contract forcing the blood up to the lungs through the pulmonary artery and through to the rest of the body through the aorta.

    Explain how electric impulses play a part in the cardiac cycle.
    Sino-Atrial Nodes cause atria to contract. This current also causes the Atrio-ventricular nodes to create an impulse, making the ventricles contract.
    This means the atria will always contract before ventricles

    How can infertility be treated?
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    (Original post by L'Evil Fish)
    Sino-Atrial Nodes cause atria to contract. This current also causes the Atrio-ventricular nodes to create an impulse, making the ventricles contract.
    This means the atria will always contract before ventricles

    How can infertility be treated?
    IVF - eggs are taken out of a woman and mixed with sperm outside the body. The most successful fertilised eggs will be put into the uterus of the mother.

    Ovary transplant

    Artificial insemination - the sperm of a man is put in the woman's ovaries without sex.

    FSH injection - stimulates egg production


    Explain what all the hormones do in the menstrual cycle.
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    (Original post by andersson)
    That isn't part of the syllabus. We have to know how an arm moves but not why it's an advantage.
    I didn't mean like why the fact our arm moves is an advantage! I meant why the pivot system is an advantage for our muscles!

    It was an practice work book with slightly different wording, you could of said:

    Muscles are attached close to the elbow joint so only have to contract a very short distance, however the hand is able to move a long distance because it's attached to the forearm which acts as a lever,

    so the way the muscles are attached close to the elbow joint means hand can move a larger distance for a given force.
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    (Original post by NatashaG)
    I didn't mean like why the fact our arm moves is an advantage! I meant why the pivot system is an advantage for our muscles!

    It was an practice work book with slightly different wording, you could of said:

    Muscles are attached close to the elbow joint so only have to contract a very short distance, however the hand is able to move a long distance because it's attached to the forearm which acts as a lever,

    so the way the muscles are attached close to the elbow joint means hand can move a larger distance for a given force.
    We don't need to know that for OCR Gateway
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    (Original post by andersson)
    We don't need to know that for OCR Gateway
    It's in my book - Lonsdale
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    Does anyone know how to answer the 6 mark questions to get the 6 marks? Is there a certain structure we need to follow?
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    (Original post by NatashaG)
    It's in my book - Lonsdale
    (Original post by andersson)
    We don't need to know that for OCR Gateway
    This is what it says in the specification but it doesn't specify how much detail we need to know it to...
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    (Original post by BP_Tranquility)
    This is what it says in the specification but it doesn't specify how much detail we need to know it to...
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    I see your name in basically all the threads I look at.. we must be taking identical exams or something
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    (Original post by BrokenS0ulz)
    I see your name in basically all the threads I look at.. we must be taking identical exams or something
    Haha, we probably do...unless...the decider is- do you take WJEC geography GCSE?


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