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  1. H

    A2 Biology | Post your doubts here

    well what could be disadvantages of cross pollination? why we can use smaller vessels for continuos culture bt not for batch culture..... why is ti easier to monitor temperature,ph etc in batch culture rather than CC
  2. H

    A2 Biology | Post your doubts here

    cn smone give me a good sentence for the point regarding assisted reproduction in conserving endangered species
  3. H

    A2 Biology | Post your doubts here

    it is important for us to preserve biodiversity for future genration to come.........some people belive that these species like us have also a right to extinct and we have no right whatsoever to make them extinct(or kill them)
  4. H

    A2 Biology | Post your doubts here

    genetic drift leads to random changes in allele frequencies over time (just due to chance of passing certian alleles more than others without any reaosn....just due to pure chance.....seemed to me a quite VAGUE idea)e
  5. H

    A2 Biology | Post your doubts here

    what does the mnarking scheme mean when it says.....ethical role in sustaining indigenous people.....please be quick
  6. H

    A2 Biology | Post your doubts here

    cn smone give me a good sentence for the point regarding assisted reproduction in conserving endangered species
  7. H

    A2 Biology | Post your doubts here

    well the exact words for these peritubular capillaries surrounding loop of henle is vasa recta
  8. H

    A2 Biology | Post your doubts here

    well http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Biology%20(9700)/9700_w08_qp_4.pdf q1http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Biology%20(9700)/9700_w08_ms_4.pdf ms says that eukaryotic DNA is in...
  9. H

    A2 Biology | Post your doubts here

    interspecific comeptition.....competition for food from the members of same population
  10. H

    A2 Biology | Post your doubts here

    yea good questionn........u got mee cnfused too.......bt its because.....the water that is moving out is reabsorbed by the peritubular capillaries or vasa recta their......so it does not dilutes the mmedullary interstitial fluid...
  11. H

    A2 Biology | Post your doubts here

    well......u knw the example quoted in mary jones book abt a rabbit population......so idea is that if the habitat is suited for population....like there is plentiful of food.....no natural predators.....good breeding spots available......no disease ........in short no selection pressures.....so...
  12. H

    Aga khan entry test 2012

    no in a2
  13. H

    A2 Biology | Post your doubts here

    well its not necessary that number of chromosomes is ODD.....and the polyploid organism may well be fertile......bt due to a different chromosome number compared to originl one....it cnt produce a fertile offspring
  14. H

    A2 Biology | Post your doubts here

    normal
  15. H

    A2 Biology | Post your doubts here

    Explain the source and importance of removing nitrogenous waste products from the body. deamination; ref. to ornithine cycle ; ref. to not all urea / produced each day / always some present ; ref. to urea ; ref. to creatinine and uric acid ; and ammonium ions ; produced in liver ; continuously /...
  16. H

    A2 Biology | Post your doubts here

    well definition of excretion says removal of waste poducts of metabolism that are toxic (e.g urea) or in excess.....cn u name a product which is excess.....i guess water ll be one.....is co2 also an excess product?
  17. H

    A2 Biology | Post your doubts here

    chek revison guide....its a hundred pages.......http://studyguide.pk/?p=431
  18. H

    A2 Biology | Post your doubts here

    here is my guess;cnsidering previous papers EXCRETION..... FEREMENTER,batch/continuous culture,penicillin production biodiversity meaning,reasons for mantaining it, interpretation of action and absorption spectra, gm crop,golden rice,BT maize/inbreeding in maize+polyploidy in wheat chi square...
  19. H

    A2 Biology | Post your doubts here

    SO LETS start biology(hardest paper 4 me)
  20. H

    A2 Biology | Post your doubts here

    and paper 32 went AWESOME
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