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  1. Dharitha_98

    Biology P22 October 2014

    Haha, now I've absolutely no idea whether I was right or wrong. Wait, the question said 'nitrates ions', right? I don't think they were referring to large molecules or nitrate salts itself. I was mostly confused about whether they would move in by active transport or diffusion (against or down...
  2. Dharitha_98

    Biology P22 October 2014

    Oh, for that I wrote that the nitrate ions were small and water soluble, so they couldn't diffuse through the cell surface membrane, because only lipid-soluble substances can pass through it. And I wrote that it diffuses through ion channels by facilitated diffusion. Although I think it passes...
  3. Dharitha_98

    Biology P22 October 2014

    For the tumour question I wrote about 'abnormal, uncontrolled cell division by mitosos' and about how the plasmid contained genes that affected this mitotic cell division, and how it 'shortens the interphase stage of mitosis'. I think I should also have written about the Tumour suppressor gene...
  4. Dharitha_98

    Biology P22 October 2014

    Same! I had to choose between two 4 mark questions in the last 10 minutes, and I successfully ended up writing only a sentence. For one of the 2 questions. I hope P1 and P3 will be good..
  5. Dharitha_98

    Biology P22 October 2014

    Agreed. Although I found it to be really lengthy. I honestly hope I wasn't the only who lost time.
  6. Dharitha_98

    Biology practicals 34

    How sunken stomata reduces the rate of transpiration in xerophytes: they cause water vapour to accumulate in the pits, therefore reducing the diffusion of water molecules outside by osmosis (because of the water potentials) so less water is lost. You're welcome. :)
  7. Dharitha_98

    Biology practicals 34

    Oh, and the graph was awesome. I'm so glad we didn't have to plot one using our own results. Tehe.
  8. Dharitha_98

    Biology practicals 34

    I accidentally took 4 readings which included '20 minutes' as well, instead of just '0 minutes' in the beginning. Guess that was one of the only major mistakes I made. :unsure:
  9. Dharitha_98

    Biology practicals 34

    I think it was pretty good. Not very unusual. Although the writing part was sort of silly, which makes me think they were really tricky.
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