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Asked by Noir | Feb 21, 2007 | AS Level > Biology > Coursework
Noir
Noir asks:

I am studying AQA B biology by distance learning, at home, in the middle east. I do not have access to any laboratory equipment. I do have a light microscope, and could get hold of iodine (from a chemist), ph indicator (from a garden centre). As such I feel that my coursework is limited to a transpiration experiment, where a plant is wrapped in a bag, and transpiration rate is determined by weight loss. I have been advised that the effect of wind (using a fan) on transpiration rates, will not be sufficient to gain me an AS pass. (I would like to do as well as possible, however, I have no tutor to advise me.) How can I expand this to bring it up to AS level? Are there any other experiments that I can carry out with only household equipment?

etutor answers:
You can't really 'expand' and experiment.....putting in extra scientific knowledge does not work because it is not actually necessary for the experiment. If you have a digital kitchen scales you could do the well known experiment on osmosis in potatoes. This is similar to one done at GCSE but at AS level you could try to determine the actual water potential of the potato cells. This is assuming that osmosis is in your AS specification.

2 student responses

Noir
Noir

Hi, I have been investigating the possibility of doing the potato experiment, does it have to be done with distilled water, if so where would normally get hold of this.  Also where would you normally purchase sucrose to make the solution?  Lastly, my houshold scales do not measure less than 1gram.  Will this be sufficient in terms of accuracy for an AS piece of work?

responded Mar 5, 2007 3:42:08 PM GMT
Noir
Noir

Hi, I have been investigating the possibility of doing the potato experiment, does it have to be done with distilled water, if so where would normally get hold of this.  Also where would you normally purchase sucrose to make the solution?  Lastly, my houshold scales do not measure less than 1gram.  Will this be sufficient in terms of accuracy for an AS piece of work?

responded Mar 5, 2007 3:42:14 PM GMT
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Noir
Noir
Last online Tue May 15 2007 3:28 PM GMT
Member since Feb 21, 2007
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