Logged out
Access All our Essays in an Instant
Swap your work for FREE access, or pay £4.99 for instant access
My hypothesis is that with an increase in temperature a Daphnia's heart rate willincrease.
Member rating:
(7 votes)
| Words:
| Submitted: Tue Oct 21 2003
Page Preview
On the left is an image preview of every page of this document, and below are the first 150 words with formatting removed:
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. This is due to the Daphnia being an ectothermic organism, so its body heat is determined by its environment, namely that their body temperature is the same as the water they are floating in. Thereby having a direct effect on its metabolic rate. b) A Daphnia was taken via a teat pipette from a beaker of room temperature water (Measured at 20?C) and placed onto a cavity slide, this was then placed under a microscope. The heart was then located via the use of diagrams and confirmation sought by a person who had previously carried out the experiment. It was then decided that to get the most accurate results a group...
To see the full version of this document, and 145,841 others
