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Size:  18.8 KBI have trouble understanding this mark scheme.. the question simply asks why the walls of the xylem are lignified but I am not sure which explanation relates to what function..

    does F3 relate to E4? Thanks
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    (Original post by upthegunners)
    Name:  xssss.png
Views: 134
Size:  18.8 KBI have trouble understanding this mark scheme.. the question simply asks why the walls of the xylem are lignified but I am not sure which explanation relates to what function..

    does F3 relate to E4? Thanks
    Is it not the case that capillary action is dependent on the cohesion of water molecules to each other and the xylem wall?
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    (Original post by joostan)
    Is it not the case that capillary action is dependent on the cohesion of water molecules to each other and the xylem wall?
    I am not too sure

    I am awful at Alevel Biology
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    (Original post by upthegunners)
    I am not too sure

    I am awful at Alevel Biology
    I put the in as a disclaimer, in case I'm wrong.
    I'm fairly sure this is true: http://ga.water.usgs.gov/edu/capillaryaction.html
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    It says "award for function and explanation independantly" so they don't necessarily need to match up!
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    Lignification prevent xylem collapsing from the tension caused by transpiration pull on the water column.
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    (Original post by linkdapink)
    It says "award for function and explanation independantly" so they don't necessarily need to match up!
    Really?!?! That's just awful. Why do we even try?
 
 
 
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