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Effect of lead chloride on the growth of cress seedlings

Asked by rafer88 | Mar 18, 2007 | A Level > Biology > Coursework
rafer88 asks:


i was stuck on this coursework. I wanted to know that how could i talk about the intraspefic and interspecific comepetition in this coursework. We hade to distribute the seeds in 3 diffiernt ways: Tip, Grid and Sprinkled. How could i link the comeptition bit with this. And one more thing is that how does lead chloride effect CALVIN CYCLE.

Also what is the DRY MASS METHOD and how could we calculate the growth of the seeds by using this method. If this method is not appropriate then how else could we calculate the growth of the seeds.

Thank you

etutor answers:
I would imagine that tipping would make the seeds close together (a lot of competition), sprinkling a bit further apart, and 'grid' well spread (so least competition). Lead is an enzyme inhibitor and so disrupts the Calvin cycle. To measure dry mass you put the seedlings in an oven at about 80oC and keep weighing them until they no longer lose any more mass - that is then their dry weight. Unless you have a large number of seedlings, the dry weight is likely to be very small indeed.

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