• We need your support!

    We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
    Click here to Donate Now (View Announcement)

Search results

  1. M

    BIOLOGY practicals help

    @paradoxice: well dude, this is for u..!! this is written in the book of biology...Written by mary Jones....senior xaminer of Cambridge...!! so i dont know whats correct....i just said what i read here..so this is the source...!! if m right, it will help u....if i failed to get the correct info...
  2. M

    AS Math Help

    if u are lucky enough...!! u will get A.....just 80%.....but.....its 99% chance that u wont get an A........23 is lot!
  3. M

    A level Biology: Post your doubts here!

    Q) Explain how vaccination can control disease? ---> Vaccine contains the micro organisms living or dead..when vaccines are injected, it gets into the body and body immune system recognize it as a foreign body.....the specific B and t Cells divide mitotically to form a clone.......which...
  4. M

    Advice Needed

    well....if u are goin for biomedical or genetic..or bla bla...u better appear physics later....now, goin for electrical architect or whatever, i would prefer bio later..thats it..!!
  5. M

    A level Biology: Post your doubts here!

    Macrophages only cut the pathogens up to display antigens or they also engulf pathogens by phagocytosis?
  6. M

    BIOLOGY practicals help

    well...i didnot say m correct....!! but i read like this..in Cambridge International Biology by Mary Jones, who is a senior xaminer in Cambridge...!! error should b added...i wrote that one...!! well...error in ruler or the stopwatch.......the rule is same i guess....!! ..but the xample given in...
  7. M

    BIOLOGY practicals help

    can u plz look at it once...there are 20 divisions in 1cm..which means...1 division=0.05cm...i think m correct...!! so the same is written as error..!!
  8. M

    BIOLOGY practicals help

    as far as i m concerned...its in second...so while that needle moves, it doesnot more than a second....therefore, i wrote INitial timing =(0±1)s and..final timing=(15±1) s ......so time taken is 15 seconds..with error of 2s...>!! therefore 2/15*100...thats what i did..!! i dont...
  9. M

    A level Biology: Post your doubts here!

    Explain the highlighted points for the question..!!
  10. M

    Biology paper 5

    Well, m tensed about the graph asked....!! so.....i need to mug up all the graphs that are possibly asked...! so..some help needed...what are the graphs asked..any idea? i mean..like....rate of photosynthesis and co2 concentration...or rate of photosynthesis and light intensity..!! these are...
  11. M

    BIOLOGY practicals help

    that question : http://www.xtremepapers.com/CIE/Interna ... _qp_33.pdf ms for that question: http://www.xtremepapers.com/CIE/Interna ... _ms_33.pdf 1 (f) number...!!
  12. M

    BIOLOGY practicals help

    no..its was in a ruler...!! well..i wil definitely put the link here..if i find it..!! will search it later..and put it here...!! but...u are wrong for sure..>!! even if uncertainty is 0.5 u have to add the error to get 1....!! as i did..!! u have to put 0.5 where i kept 1 and..put 1...
  13. M

    bio p33

    uncertainty ...i got 13.3 and....x axis is time...y axis concentration!!
  14. M

    as geometric sequence help please

    QN2) a) x, y and z are 1st 2nd and 4th term in A.P so, a+d/a = a+3d/a+d ....and..get d=0 and d=a.....d=0 is not possible....whereas d=a is valid..so put Since r=a+d/a= a+a/a = 2... b) and..i didnot get this question..., i thot it was a+(n-1)d=ar^(n-1) ...and i got...
  15. M

    discuss bio ppr 33 on 8th nov

    in Y axis...20 to 2cm.....and X axis 10 to 2cm..this is the most correct scale i think..!!
  16. M

    BIOLOGY practicals help

    And guys....this is what i did for error one... Initial time = (0 ± 1) s Final time= (15 ± 1) s so....time taken =(15 ± 2)s....so uncertainty=2/15 * 100% giving u 13.3% ( well..i read the least count need to b halved to get an error in Mary JOnes book........but....in some...
  17. M

    BIOLOGY practicals help

    Time was independent..so it should b on X axis for sure.....coz, the concentration collected down there depends on the time u allow the thing to pass through...!!
  18. M

    BIOLOGY practicals help

    yeah...rest was same as mine..the 1st one is also the same..but this is how i wrote...... Fig 2.2-->has longer projections and flat at the end........fig 2.3--->has shorter projections and spherical at the end..>!!
  19. M

    BIOLOGY practicals help

    error is 13.3%....i dont know how ur teacher said its 3.33% ...may b m wrong too...!!
  20. M

    BIOLOGY practicals help

    though 24 hrs is not over.2 3 hours to go..!! i think its not against the rule of XPF......p33 all over the world for bio is over till now...so.. @emily793: well...left a space for darkly stained layer, and..made two layers above it as i saw there were two layers when i magnified...
Top