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Barnacles

Asked by kat-128 | Jun 21, 2007 | A Level > Biology > Coursework
kat-128
kat-128 asks:

Hey
Im currently doing my A2 level Biology coursework on "the effect of the salinity of sea water on the rate of a barnacles cirri beats". i understand that it is to do with osmosis etc. but i dont know how to start my methodology for my plan. for example, what salinity levels should i measure and how should i measure them?? would be extremely grateful of your help!!

etutor answers:
Measuring salinity is difficult and really requires special equipment. The following web site does give a simple method involving evaporation of the water
http://www.oceanscientific.com/web/osil/osil.nsf/a/5789D6CD960998AA80256D2C0036BC0C!opendocument
It would be better to make up artificial sea water by dissolving different amounts of salt in water. Normal sea water has a salinity of about 3.5%, so this should be the centre of your range

1 student responses

kat-128
kat-128

Thanks that's a great help. Appreciate it loads

responded Jun 21, 2007 8:49:49 PM BST
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Katherine
Katherine
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