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  1. H

    A2 Biology | Post your doubts here

    done the papers from 2009 to 2011 .....still not satsifed......1st 3 papers i.e 2007 and 8 ones were hell easy...........knw any other source for practice??
  2. H

    A2 Biology | Post your doubts here

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Biology%20(9700)/9700_w11_ms_53.pdf q1 plan part.....does amount of sample even matters for chromatography....i mean y we want samen mass.......it shudnt make any difference the other way
  3. H

    A2 Biology | Post your doubts here

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Biology%20(9700)/9700_w11_qp_53.pdf q1 b (i)i dun understand @ keeps organelles intact.................................even if i dont add buffer why wud even the pH CHANGE
  4. H

    A2 Biology | Post your doubts here

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Biology%20(9700)/9700_w11_qp_51.pdf q2 a why ms doesnt allow volume of culture medium....cos i think nutrient cconc shud be kept constant bt ms says only composition
  5. H

    A2 Biology | Post your doubts here

    cn we say here that in CC nutrient conc is kept constant throughout so its not a variable...bt in batch rate will decrease due to nutrient conc. falling plus i dont get this that how s.d is realted to reliability....cud smone make it clear by quoting an example please
  6. H

    A2 Biology | Post your doubts here

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Biology%20(9700)/9700_w09_qp_52.pdf i cant undrstand q1...part b........they only showed graph at day 3 for control.....and........watrs happening here
  7. H

    A2 Biology | Post your doubts here

    wat kind of graph is this
  8. H

    A2 Biology | Post your doubts here

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Biology%20(9700)/9700_w09_qp_52.pdf 3 b (ii) there are 5 repeats at each temp. and conc.................still insufficient data??????
  9. H

    A2 Biology | Post your doubts here

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Biology%20(9700)/9700_w09_qp_51.pdf question 2 d......we have 10 samples each fot Y and no Y ....and again ms says insufficient replicates??? and one rule for paper 5.........use the rounded up value...
  10. H

    biology paper 5 29TH MAY !!!

    critical values corresponding to probabilities are given.....if ur value is greater than it then results are significant
  11. H

    A2 Physics | Post your doubts here

    i m getting a ridiculuos value for K......I hav chekd many times....this is wat i get 2.05*10^-16 and 4.79*10^-15......now the 2.05 one is using the correct best fit gradient.....bt error is too large.....i hv chekd multiple times bt still
  12. H

    A2 Physics | Post your doubts here

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_w11_qp_52.pdf q2 graph arent error bars tooo small??
  13. H

    A2 Biology | Post your doubts here

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Biology%20(9700)/9700_s10_qp_52.pdf question 2 angelgirl:) wh ms does not mentions that volume of 5 cell samples taken from each culture shud also be constant............dont u thnk dats a good enuf control...
  14. H

    A2 Biology | Post your doubts here

    well wen we ll be forcing out air...hw i mean.....will not the soln go out....i am nt getting it
  15. H

    A2 Biology | Post your doubts here

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Biology%20(9700)/9700_s10_qp_52.pdf q1 now why we want dry leaves here b4 measuring transpiration rate
  16. H

    A2 Biology | Post your doubts here

    ??? dint understand a single word wats happening here
  17. H

    A2 Biology | Post your doubts here

    i was saying the question doesnt say to vary light intensity....bt u said it did so???
  18. H

    A2 Biology | Post your doubts here

    ??????????
  19. H

    A2 Biology | Post your doubts here

    Statistically significant result are those that are not due to chance bt there is reason.....e.g there is difference b/w no. of stomata in shade and sun leaves if i do random sampling....now if my results are not siginificant ...then this means that the numbers in two grupps are not too much...
  20. H

    A2 Biology | Post your doubts here

    Leaf discs from shade leaves will photosynthesise at a higher rate in low light intensity than leaf discs from sun leaves. ????
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