Qualification > Sciences

urgent:what is dependent and independent in biology

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forkasha:
i can't differeniate between them at all can anybody help????  :'( :'(
thanks in advance :) :) :) :)

sanity_master:
as their names indicate, the "dependent" variable(on the y-axis) depends on the "independent" variable(on the x-axis).

for example, the rate of a reaction DEPENDS on temperature.
so the rate is dependent and the temp. is independent, as temperature increase, rate of reaction increase (not the other way around)

it might be sometimes difficult to identify the variables in paper 5 (A2), but eventually u can know them.
as in OCT.NOV 2007 p.5.......Question 2,a (ii) :: the dependent would be the REACTION TIME and the independent would be the CONCENTRATION OF CAFFEINE.


hope u got the idea =)

forkasha:
Thank u very much u have helped me a lot thanks thanks 2 infinty ..so how is paper 5 going with u ???
+++++++rep
u r the best
thanks??

sanity_master:
ur welcome =) if u have any other question, feel free to ask ;)

its somehow gd, i still have a bit of a problem with the statistical questions though, but not bad :D :)

wt subjects u taking this june?

Tammy:
Independant variable is the variable that you change in the experiment....
Dependant variable is the variable that changes because the Independant variable did

Example for the Beetroot experiment: For each time, we are changing the temperature to see the effect of temperature on the beetroot... so the independant variable here is the temperature
What changes when you change the temperature? The degree of redness of the testube does... so the dependant variable is the degree of redness

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