Null hypothesis : ethanol will have no effect on the heart rate of the daphnia i will change the concentration of my ethanol solution by dilution and will therefore plot a graph in addition, a correlation and anova test will be calculated to determine the relationship (if any) between the concentration of ethanol and the heart rate of the . Investigation in to the effect of caffeine concentrations on daphnia heart rate a probability level to describe the likelihood that the null hypothesis is true. The null hypothesis in all cases is that each of the drugs will have no effect on the concentration rate of daphnia variables in order to see whether it is actually the drugs that are causing the change in the heart rate of daphnia the only variable that can change is the concentration of the drug.
The effect of decaffeinated versus regular coffee on blood pressure and heart rate was our null hypothesis was that consumption of. Chemicals that speed up heart rate are known as stimulants, whereas chemicals that slow down the heart rate are known as depressants develop a hypothesis that predicts how the heart rate of the daphnia will change when it is exposed to a depressant. The objective of this research was to determine the effects of acidification, a change in water ph, on the grass shrimp palaemonetes pugiothe null hypothesis is that when water temperature, salinity and ph change, the heart rate of the grass shrimp in beats per minute will not change.
Hypothesis and null hypothesis: hypothesis- i hypothesize that if i put a daphnia into a caffeine solution then the caffeine will cause an increase in the daphnia’s heartbeat i hypothesize that different concentrations of caffeine shouldn’t have a different effect on the daphnia’s heartbeat. There is no correlation between concentration of caffeine solution and the heart rate of daphnia scientific basis for the hypothesis caffeine acts as a stimulant drug, causing increased amounts of stimulatory neurotransmitters to be released. Hypothesis- their will be a positive correlation between the concentration of caffeine given to the daphnia and its heart rate my reason behind this hypothesis is based on the fact that caffeine affects the heart rate of humans, as it is a stimulant. Daphnia: null hypothesis and heart rate an investigation on the rate of reaction of the enzyme catalase on the substrate hydrogen peroxide succession in sand dunes. Does caffeine affect the heart rate of daphnia by (your name) does caffeine effect the heartrate of daphnia hypothesis: i believe caffeine, when added to the .
Due to the information stated in the background knowledge, i can predict that caffeine will induce a higher heart rate in the daphnia, as opposed to daphnia exposed to no caffeine this increase in heart rate will increase as the concentration of caffeine increases, and the length of time the daphnia are exposed to the caffeine solution increases. Unit 6 preparation to formulate a good null hypothesis the effect of caffeine on heart rate why daphnia. Therefore the null hypothesis (that there would be no difference between the heart rate of daphnia sp when exposed to temperatures of 10 ⁰ c and 20 c) was rejected ⁰ the alternative hypothesis that there will be a difference between the heart rate of daphnia sp when exposed to temperatures of 10 ⁰ c and 20 c was supported.
The null hypothesis states that the daphnia's heart rate will be the same in twenty-two degree water and eighteen degree water as in the control water of twenty degrees introduction to begin the lab, we took a sample of water at twenty degrees celsius as our control. Hypothesis if the daphnia is exposed to road salts with higher concentrations then its heart rate will be higher than that of a regular water environment this is because road salts contain several chemicals as well as dyes that are very harmful to organisms, especially in high concentrations. In this experiment i got to look at the effect of ethanol on the heart rate of a daphnia creature although i didn’t know what substance i was testing, i had hypothesized that ethanol would make the heart rate slow down therefore, the null hypothesis is that ethanol will have no significant effect on the heart rate.
Alternative hypothesis: there is a positive/ negative (depending on result) correlation between the concentration of caffeine and the heart rate of daphnia as edexcel biology xavier daniel, phd effect of caffeine on daphnia heart rate method: 1. • determine the effects of various drugs on the daphnia’s heart rate • before you begin, prepare a laboratory write-up using the proper format to include: title, purpose, hypothesis, null hypothesis, materials, procedure, data tables and. The alternative hypothesis is that as temperature increases the heart rate of the organism will also increase for the second experiment the first null hypothesis is that alcohol solutions have no effect on the d magna heart rate and the second null hypothesis is that caffeine solutions have no effect on the heart rate.
Hypothesis/ null hypothesis : as the caffeine concentration rises, so does the mean heart rate of daphnia caffeine does not affect the heart rate of daphnia. Hefc biological science - unit 2 joseph colledge assessed practical variation of daphnia heart beat with temperature a) my hypothesis is that with an increase in temperature a daphnia's heart rate will increase, likewise with a reduction in temperature the heart rate will decrease.
(caffeine increases the heart rate of daphnia ) null hypothesis: there is no significant difference between the heart rate of daphnia in distilled water compared to . A comprehensive six page worksheet aimed at advanced biology students, this resource deals with all the major aspects of how a nerve impulse origin. The null hypothesis to our experiment was that the average heartbeat rate of the daphnia will not change when it is exposed to a salt concentrate that is, the heartbeat rate of daphnia will remain identical even when the environment changes. The null hypothesis to this is: i hypothesize that drugs will have no effect on the daphnia’s heart rate daphnia heart rate increased by ten to twenty beats .