Biology A Level and IGCSE resources
Hi, I am Allison Gardner and welcome to my website:
There are loads of FREE Biology A Level and IGCSE resources available
Including worksheets, PowerPoint presentations, quizzes, videos and games
The site focuses mainly on Edexcel A level and Cambridge IGCSE Biology
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Daphnia-Caffeine experiment alternative
Posted on October 18th, 2011 No commentsWelcome back to ClickBiology
If you are working abroad then it can be a big problem trying to complete the core practicals included in the Edexcel A Level syllabus. At the moment I am having a lot of difficulty obtaining simple bacteria and in the past it has been impossible to get daphnia shipped internationally.
One alternative to using daphnia to observe the effects of caffeine on heart rate is to use mosquito larvae.
My colleague picked this tip up on a recent exam review session in Madrid. He tried it out and found that it was easier to do than with daphnia, both the heart beat could be counted (and it is slower than daphnia)and a large blood vessel could also be observed pulsating. In hot countries it should be fairly easy to get hold of the larvae from any area of still water.Related posts
A2 coursework, A2 Level, AS level, coursework, Teaching tips alternative, AS level, biology, caffeine, daphnia, heart rate, mosquito larvaeLeave a reply
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