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Investigating the effect of caffeine on the heart rate of daphnia Aim: Investigating the effect of caffeine in heart rate of daphnia. Hypothesis: I predict that the stronger the solution of caffeine, the higher the heart rate per minute. Null Hypothesis I predict that no relationship will be found between the concentration of caffeine and the heart rate of the Daphnia. Background Knowledge Caffeine Caffeine is in tea, coffee, chocolate, many soft drinks, and pain relievers and other over-the-counter medications. In its natural form, caffeine tastes very bitter. But most caffeinated drinks have gone through enough processing to cover up the bitter taste. Caffeine is a drug that is naturally produced in the leaves and seeds of many plants. It's also produced artificially and added to certain foods. Caffeine is defined as a drug because it stimulates the central nervous system, causing increased alertness. Caffeine gives most people a temporary energy boost and heightens the mood. However,...

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