Qualification > Sciences
Edexcel BIOLOGY Doubts!!!!
ksitna:
HEY UM WHAT ARE DEPENDENT AND INDEPENDENT VARIABLES AGAIN?
Assi1993:
the dependent variable is the one you get as a result from your experiment.. on the y axis
the independent variable is the one u can control.. on the x axis
Tammy:
--- Quote from: Summer :] on May 09, 2010, 05:19:30 pm ---All the practicals in unit 1 and 2
-daphnia's experiment
-cell permeability experiment
-vitamin c experiment
-enzyme controlled reactions experiments
-root tip squash experiment (observing mitosis)
-investigating totipotency in plants (tissue culture)
-mineral ions deficiency experiment
-antimicorbial properties of plants experiment
- plant fibres experiment
thats all
and some background of some unit 1 information such as CVDS and their risks, Genetic diseases (like CF) and genetic diagrams, what else..
genetic screening
(scan through)
for unit 2, basically you're taking the exam now in june so you know the information/facts there..
--- End quote ---
Yeah thanks.... I almost did that... and I just read through the information in unit 1 & 2....
Good Luck tomorrow everyone... Hope the second question is an easy one!!!!!!!!!! ;D
Blizz_rb93:
--- Quote from: Assi1993 on May 10, 2010, 03:30:40 pm ---Suggest why Daphnia needs a heart and circulatory system
--- End quote ---
I think so it can be able to pump the blood around the circulatory system so the person testing on daphnia will be able to observe the heart beats
basically i guess with the heart as a pump and the circulatory system as a transportation for the blood
im not 100% accurate but i think it's something like that, if not plz someone correct me :)
Uchia:
daphnia needs a heart system because it has a low surface area to volume ratio and diffusion it self wouldn't be effective to transport substances inside and outside so a heart system is needed to make susbtances as near as possible to diffuse this is done by the fluid transported through the body (transport medium which is the blood) with the help of the heart a transporter
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