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    Hi wondering if anyone has any 4+ mark past paper questions based on or asking to describe/explain
    gas exchange in insects or on meiosis,
    I've looked around and i dont know if any have been published so if anyone has any from the exam board or something a teacher has written up can you post them/a link to them, and a markscheme if possible.
    also if you have any 4-7 mark Q you need answering or want some on a particular topic in AQA UNIT 2, say so i have a load of the 6 markers for the other topics, eg carbohydrates, gas exchange in mammals ect
    thanks for any help
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    I don't recall the past papers asking anything about gas exchange in insects so maybe that will come up?

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    True I haven't seen any as well. Btw does anyone have the biology unit 2 past paper for january 2009?
    I can't seem to find it anywhere.
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    (Original post by goblins took me)
    Hi wondering if anyone has any 4+ mark past paper questions based on or asking to describe/explain
    gas exchange in insects or on meiosis,
    I've looked around and i dont know if any have been published so if anyone has any from the exam board or something a teacher has written up can you post them/a link to them, and a markscheme if possible.
    also if you have any 4-7 mark Q you need answering or want some on a particular topic in AQA UNIT 2, say so i have a load of the 6 markers for the other topics, eg carbohydrates, gas exchange in mammals ect
    thanks for any help
    Sorry again. I couldn't find any 4 markers on gas exchange and meiosis.
    If it's possible could you upload a six marker on transpiration and anything in general to do with plants?
    Thanks a lot
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    (Original post by goblins took me)
    Hi wondering if anyone has any 4+ mark past paper questions based on or asking to describe/explain
    gas exchange in insects or on meiosis,
    I've looked around and i dont know if any have been published so if anyone has any from the exam board or something a teacher has written up can you post them/a link to them, and a markscheme if possible.
    also if you have any 4-7 mark Q you need answering or want some on a particular topic in AQA UNIT 2, say so i have a load of the 6 markers for the other topics, eg carbohydrates, gas exchange in mammals ect
    thanks for any help
    I did find some 4 mark questions on meiosis. Here they are:
    Sorry I have no idea why the images are in red :confused: but I hope u can read them.Name:  1.jpg
Views: 608
Size:  54.0 KBName:  2.jpg
Views: 588
Size:  61.0 KBName:  answer 1.jpg
Views: 580
Size:  58.9 KBName:  answer 2.jpg
Views: 595
Size:  53.5 KB
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    (Original post by lorobolorolo)
    True I haven't seen any as well. Btw does anyone have the biology unit 2 past paper for january 2009?
    I can't seem to find it anywhere.
    There isn't. Only June 2009 and onwards.

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    (Original post by The_Blade)
    There isn't. Only June 2009 and onwards.

    Posted from TSR Mobile
    ahhh ok. But why isn't there one? There might not be one on the AQA website but there should be one somewhere on the net I'm guessing.
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    (Original post by lorobolorolo)
    I did find some 4 mark questions on meiosis. Here they are:
    Sorry I have no idea why the images are in red :confused: but I hope u can read them.Name:  1.jpg
Views: 608
Size:  54.0 KBName:  2.jpg
Views: 588
Size:  61.0 KBName:  answer 1.jpg
Views: 580
Size:  58.9 KBName:  answer 2.jpg
Views: 595
Size:  53.5 KB
    ooh they look great THANKS
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    (Original post by lorobolorolo)
    Sorry again. I couldn't find any 4 markers on gas exchange and meiosis.
    If it's possible could you upload a six marker on transpiration and anything in general to do with plants?
    Thanks a lot
    plants i got...
    water is transported through the xylem of plants. Describe and explain how the cells of the xylem are adapted for this function.(6)

    1. Thick cell walls;
    2. With stand tension / Negative pressure;

    3. Lignin in cell walls;
    4. Walls waterproof/ withstand tension/negative pressure;

    5. Xylem cells have no end walls/ tubular (not hollow);
    6. So continuous column of water;

    7. Xylem vessels are stacked on top of each other;
    8. So a continuous column of water;

    9. Have no cytoplasm/ hollow;
    10. Reduces resistance to flow of water/ so a continuous column of water;

    11. Xylem cells have pores/ pits (in side walls);
    12. Enable sideways flow/ by-pass blockages/ allows entry or exit of water;

    13. Narrow tubes;
    14. Allows capillarity/ increased surface area for adhesion;

    need at least 3 adaptions and relevant explanations

    Describe how water moves through a plant using cohesion-tension theory.(6)

    1. Water evaporates / transpires from leaves;
    2. reduces water potential in cell / water potential / osmotic gradient across cells (ignore reference to air space);
    3. water is drawn out of xylem;
    4.creates tension
    5.cohesive forces between water molecules;
    6. water pulled up as a column;

    How are chloroplasts adapted for photosynthesis.


    •Contains chlorophyll – for light absorption.
    •Different pigment – absorb different wavelengths of light.
    •Large surface area of the thylakoids- maximise light catchment.
    •Stroma- contains enzymes for photosynthesis.
    •Shape- Large surface area for carbon dioxide absorption.
    •DNA and ribosomes- quickly make proteins needed
    •Starch grain- an energy storage molecule.

    Describe and explain how water is transported from soil to the xylem.

    -mineral ions are actively transported into root hair cell
    -lowers water potential of cell
    -water moves in to root hair cell by osmosis
    -water moves through cortex and endodermis, via 2 routes
    -symplastic pathway, though the cells cytoplasm by osmosis
    -apoplastic pathway, though cell wall by diffusion
    -at endodermis the casparian strip forceswater into endoderm cytoplasm
    -mineral ions actively transported into xylem
    -water moves into xylem by osmosis


    not found any for transpiration though maybe that will come up?? :confused: i'll keep an eye out...
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    (Original post by lorobolorolo)
    True I haven't seen any as well. Btw does anyone have the biology unit 2 past paper for january 2009?
    I can't seem to find it anywhere.

    apparently they didnt have one because it was the first year of a new spec or something like that :confused: so apparently june is the first published one :banghead: kinda annoying that...
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    (Original post by goblins took me)
    plants i got...
    water is transported through the xylem of plants. Describe and explain how the cells of the xylem are adapted for this function.(6)

    1. Thick cell walls;
    2. With stand tension / Negative pressure;

    3. Lignin in cell walls;
    4. Walls waterproof/ withstand tension/negative pressure;

    5. Xylem cells have no end walls/ tubular (not hollow);
    6. So continuous column of water;

    7. Xylem vessels are stacked on top of each other;
    8. So a continuous column of water;

    9. Have no cytoplasm/ hollow;
    10. Reduces resistance to flow of water/ so a continuous column of water;

    11. Xylem cells have pores/ pits (in side walls);
    12. Enable sideways flow/ by-pass blockages/ allows entry or exit of water;

    13. Narrow tubes;
    14. Allows capillarity/ increased surface area for adhesion;

    need at least 3 adaptions and relevant explanations

    Describe how water moves through a plant using cohesion-tension theory.(6)

    1. Water evaporates / transpires from leaves;
    2. reduces water potential in cell / water potential / osmotic gradient across cells (ignore reference to air space);
    3. water is drawn out of xylem;
    4.creates tension
    5.cohesive forces between water molecules;
    6. water pulled up as a column;

    How are chloroplasts adapted for photosynthesis.


    •Contains chlorophyll – for light absorption.
    •Different pigment – absorb different wavelengths of light.
    •Large surface area of the thylakoids- maximise light catchment.
    •Stroma- contains enzymes for photosynthesis.
    •Shape- Large surface area for carbon dioxide absorption.
    •DNA and ribosomes- quickly make proteins needed
    •Starch grain- an energy storage molecule.

    Describe and explain how water is transported from soil to the xylem.

    -mineral ions are actively transported into root hair cell
    -lowers water potential of cell
    -water moves in to root hair cell by osmosis
    -water moves through cortex and endodermis, via 2 routes
    -symplastic pathway, though the cells cytoplasm by osmosis
    -apoplastic pathway, though cell wall by diffusion
    -at endodermis the casparian strip forceswater into endoderm cytoplasm
    -mineral ions actively transported into xylem
    -water moves into xylem by osmosis


    not found any for transpiration though maybe that will come up?? :confused: i'll keep an eye out...
    Thank you as well. I will try and read through these.
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    (Original post by The_Blade)
    I don't recall the past papers asking anything about gas exchange in insects so maybe that will come up?

    Posted from TSR Mobile
    maybe :curious: i've seen diagram ad short mark Qs etc but never any high mark describe ones :confused:
 
 
 
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