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Edexcel Biology unit 2B watch

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    Here is some of the answers in it. [WARNING NOT 100% COrrect!!!]

    Q1:
    eosinophil/basophil; monocyte; antibodies; nucleus;
    Q2:
    A - blood capillaries (not sure looks like RBC to me!!!)
    B - squamous epithelium/type 1 pneumocyte
    Alveolus Q:
    The wall is thin/moist/1 cell thick; high surface area; alot of blood capillaries; maintains steep gradients; increases rate of diffusion;

    Ok now i lost track of q number haha.:rolleyes:
    Q asking the flower how is it pollinated.
    insect pollinated; large petals, the stigma is in the flower; nectaries; stigma small surface area; etc;

    Q bout the heart labeling:
    A - Aorta;
    B - endocardium? (Not sure i hate this! its not pointing to the valves!!)

    Q asking how is the heart supplied wif oxygen:
    reference to coronary circulation; oxygenated blood enter coronary arteries; exchange of gases at the capillaries of the myocardium; blood return to heart via cardiac veins;

    Q asking how the pumping heart is coordinated:
    Pacemaker/SA node releases waves of electrical excitation/impulse to around the atrium; trigger atrial systole; then AV node pick up the excitation slowly and relase impulse; to purkije/purkyne fibre via bundle of His; trigger ventricular systole; delay between SA node impulse and AV node impulse ensures both dont contract at the same time;

    Q related to graph of glucose somthing(dun remember much)
    (i) forgot the Q but answer is:
    Active transport;
    (ii) why glucose transport in more whn thr is Na ions.
    Due to sodium co transport
    (iii) glucose transport in faster than fructose?
    glucose enters by fac. d and active t., but fructose by fac dif.

    Q related to the adaptation.
    (i) state n explain 2 ways how inver can live in water with low oxygen conc:
    presence of gills; increase surface area;
    breathing tube/siphon; take in air from water surface;
    respiratory pigment/hameoglobin; transport oxygen;

    (ii) state and explain 1 way invertebrate adapt in fast flowing water:
    streamlined shape; resist water current;
    fins and tails; swimming;
    legs with hooks; hold on to smthg;

    Q bout oogenesis:
    begins at fetal dev; primordioal germ cell undergo mitosis; produce oogonis which is 2n; oogonia also undergo mitosis and grow to primary oocyte which is 2n; primary oocyte undergo meiosis I but stop at prophase I till puberty; then primary oocyte continue meiosis I to produce secondary oocyte which is n; and 1 polar body also n;
    bla bla bla....; ; ; (nyahaha)

    Root plant question.
    Label it:
    Xylem (vessel/tracheids);

    Endodermis Question:
    Reference to casparian strip; stops apoplast movements; via cell wall to cell wall; regulates water and dissolve mineral (before entering the xylem);

    Q asking why as temperature increases, more K+ ions were taken up.
    Reference to kinetic energy increases; increases collision (chances bind) of k+ ion on the protein; (not sure)

    Ok thats all i can remember nyahaha
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    how did u remember all that lol
    i got mostly the same answers

    but im sure 2a was red blood cell, the other i didnt get
    what did you write for the endodermis question?
    and what ws the name of the vessel?
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    dam, u remembered alot, i had no idea what to put for the glucose sodium question, and the glucose fructose bit, i was totally lost!! what did u write for the endodermis question, went mind blank!! lol, but got the rest of it tho, the diagram for Q2 got me tho, never seen it ever before!
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    the alveolus question was terrible
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    plus the arrow to the heart wasnt pointing at either valve, it was in the middle of both
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    thats the problem wif me, never leak a paper to me not even for 30 seconds you will be sorry! haha

    Ok bout the endodermis question
    Btw the picture bout the plant u label it as xylem.
    Endodermis Question:
    Reference to casparian strip; stops apoplast movements; via cell wall to cell wall; regulates water and dissolve mineral (before entering the xylem);
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    i just put semi lunar valve, i just thought, might as well, i got no other idea what the hell is it!!
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    (Original post by liakwen)
    thats the problem wif me, never leak a paper to me not even for 30 seconds you will be sorry! haha

    Ok bout the endodermis question
    Btw the picture bout the plant u label it as xylem.
    Endodermis Question:
    Reference to casparian strip; stops apoplast movements; via cell wall to cell wall; regulates water and dissolve mineral (before entering the xylem);

    it had to be xylem vessel or xlem tracheid
    you cant just say xylem
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    (Original post by liakwen)
    thats the problem wif me, never leak a paper to me not even for 30 seconds you will be sorry! haha

    Ok bout the endodermis question
    Btw the picture bout the plant u label it as xylem.
    Endodermis Question:
    Reference to casparian strip; stops apoplast movements; via cell wall to cell wall; regulates water and dissolve mineral (before entering the xylem);

    :eek: HAHAHA, i got that!! God dam!! im goood!! lol
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    (Original post by theultimate)



    it had to be xylem vessel or xlem tracheid
    you cant just say xylem
    dat im not sure but i beleive xylem only is ok.
    so the MS shud be like:
    xylem (vessel/tracheid) lolz i dunno
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    hopefully the mark will be given, it was a hard paper tho, maybe the boundries can get lowered a bit!!
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    (Original post by SdotK)
    hopefully the mark will be given, it was a hard paper tho, maybe the boundries can get lowered a bit!!
    at least it was wayyyy easier than unit 1 hahaha
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    unit 2b was really simple, a very 'nice' paper actually. I feel confident I will get a high mark in this one.
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    there were many interpret the data questions
    a manipulated quantitative comment was required in all 3 Qs to get full marks
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    the heart valve one was not semi-lunar they are in the aorta and pulmonary artery that valve was the atria-ventricular valve or tricupsid valve....and i thought that was a red blood cell in that alveolus picture too but it isn't there was another cell there and it had a nucleus.
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    red blood cell was definately one
    i didnt know the black thing inside the alveolus
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    what about why more k+ ions were taken up when the temperature increases....
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    im pretti sure they was refering to the av valve when they were pointing to the heart, i bloody forgot my calcalator and got the tidal volume wrong lol does anyone remeber how many marks that question was worth?
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    i think:

    increase in temp
    higher rate of respiration
    more ATP for active transport

    but that wasnt really the question, it was about explaining active transport
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    I check the pass year paper, that alvolus picture stuff, B is capillary (but sadly i put RBC, it does look like RBC u know!!!)

    As the temp increases the K+ ion uptake increase is because:
    kinetic energy increases; higher chance of k+ ion bind to protien; so on not sure. haha
    But it u talk bout the higher rate of respiration, wouldnt as temp increases the oxygen dissolve concentration in water decreases? so less oxygen less aerobic respiration so less energy? Not sure i dun remember hahaha i just assum only
 
 
 

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