Salma Ahmed
English Lit. GCSE Student
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Daphnia write up
- Words:
- 1785
- Submitted:
- Sun Mar 15 2009
- Mark submitted by Author:
Have a little read: ... Does Caffeine affect Heart Rate in Daphnia? Aim: To investigate the effect of caffeine on the heart rate of Daphnia (water fleas). Daphnia are small water fleas between 0.2 and 5 mm in length. Daphnia are members of the order Cladocera, and are one of the several small aquatic crustaceans commonly called water fleas because of their saltatory swimming style (although fleas are insects and thus only very distantly related). They live in various aquatic environments ranging from acidic swamps to freshwater lakes, ponds, streams and rivers. Introduction: What is Caffeine? Pure caffeine is a plant-based alkaloid found naturally in sources such as coffee beans, tea, kola nuts and guarana. Plants create caffeine as a pesticide, to paralyze and kill the insects feeding on them from the effects of over-stimulation. Although a pure chemical caffeine is bitter, nowadays it is also used as a flavour enhancer in a wide range of soft drinks such
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