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    Hello everyone, this is my first post on thestudentroom!

    I've been working with an extended essay topic of : "Vitalities of different elements in the growth of lemna (duckweed)"

    I used Sach culture. Each container has one nutrient missing, and I've been dealing with lack of N, lack of K, P, and Ca. Ive been showing results both quantitative and qualitative. Quantitatively, there were growths of lemna (counting the leaflets). Qualitatively, the colour and general appearnce.

    But the problem was that, in a mere week or so, all the water in the beakers had evaporated!. If I were to cover it up with cling film, I would be blocking CO2. I was thinking of using NaHCO3 instead of water as a source of CO2. But I fear that It'll screw up my results. Also, I found out about a 'capillary paper' which lets in gases, but prevents water from evaporating.
    My advisor insists that I should find a different topic.

    Can you please help me think of:

    a) a new topic inwhich an experiment can beperformed at home and shows good results within a short period of time


    b)A way to improve my previously failed lab??

    PLEAAASE HELP!!!! My deadline is approaching!!!!!!!:eek::eek::eek:
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Updated: April 17, 2011
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