Author Topic: urgent:what is dependent and independent in biology  (Read 3647 times)

Offline forkasha

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urgent:what is dependent and independent in biology
« on: May 07, 2010, 11:50:27 am »
i can't differeniate between them at all can anybody help????  :'( :'(
thanks in advance :) :) :) :)

Offline sanity_master

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Re: urgent:what is dependent and independent in biology
« Reply #1 on: May 07, 2010, 11:28:06 pm »
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 =)


Offline forkasha

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Re: urgent:what is dependent and independent in biology
« Reply #2 on: May 08, 2010, 02:21:33 am »
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??

Offline sanity_master

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Re: urgent:what is dependent and independent in biology
« Reply #3 on: May 09, 2010, 06:55:27 am »
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?

Offline Tammy

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Re: urgent:what is dependent and independent in biology
« Reply #4 on: May 09, 2010, 07:29:16 am »
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

Offline forkasha

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Re: urgent:what is dependent and independent in biology
« Reply #5 on: May 10, 2010, 02:42:51 am »
thanks @tammy :)
+rep
@stanity_master i  am better at the statistical part than the other bt over all i horrible in the whole paper
where are u taking ur exams

Offline sanity_master

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Re: urgent:what is dependent and independent in biology
« Reply #6 on: May 11, 2010, 07:07:37 am »
im in jeddah, KSA...u?

Offline forkasha

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Re: urgent:what is dependent and independent in biology
« Reply #7 on: May 11, 2010, 08:47:51 am »
same here
jeddah ksa which skool

Offline sweetest angel

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Re: urgent:what is dependent and independent in biology
« Reply #8 on: May 11, 2010, 09:33:33 am »
guys oct/noc 09 2b-
can anyone plz xplain it?
"Dont fear the creation, but fear the creator who has created the creation you fear"
"If you educate a man, you educate an individual, but if you educate a female, you educate a nation"
 I DO WHAT I WANT WHERE I WANT WHEN I WANT if mom says ok.

Offline forkasha

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Re: urgent:what is dependent and independent in biology
« Reply #9 on: May 11, 2010, 09:39:02 am »
give like an hour and i will answer u? :)
cus i'm not free at the moment
sorry

Offline forkasha

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Re: urgent:what is dependent and independent in biology
« Reply #10 on: May 11, 2010, 09:40:42 am »
oh i forgot which variant 51 or 52

Offline sweetest angel

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Re: urgent:what is dependent and independent in biology
« Reply #11 on: May 11, 2010, 10:15:29 am »
51 :)
thanks :D
"Dont fear the creation, but fear the creator who has created the creation you fear"
"If you educate a man, you educate an individual, but if you educate a female, you educate a nation"
 I DO WHAT I WANT WHERE I WANT WHEN I WANT if mom says ok.

Offline Tammy

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Re: urgent:what is dependent and independent in biology
« Reply #12 on: May 11, 2010, 10:58:31 am »

Offline HOUSE_MUSIC

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Re: urgent:what is dependent and independent in biology
« Reply #13 on: May 11, 2010, 12:32:11 pm »
am in jeddah too  :)   al-wadi international school   what about u sweetest angel & sanity master ?
By the way where nd when exactly is ur exam? and how will u revise cuz i finished the past papers (from sp07) nd i dnt know what to do now ?

sweetest angel: did u see the ms ?  if u ddnt here's the answer:

2 of:
1. ref. to adding sample to slide;
2. ref. to idea the sample is uniform;
3. ref. counting cells;
4. ref. to any detail of counting e.g. exclusions / number of squares;
2 of:
5. ref. to grid volume 0.2 mm × 0.2 mm × 0.1 mm = 0.004 mm3;
6. ref. to factor × 250 to estimate number of cells per mm3 / dividing by the
grid volume (0.004 mm3);
7. ref. to counting min.3 areas / slides and taking mean;

Offline AndrewCedric

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Re: urgent:what is dependent and independent in biology
« Reply #14 on: May 11, 2010, 02:05:47 pm »
dependent= what u observe
independent= what u change

example--> The rate of photosnthesis is dir. prop. to co2 conc.

co2 conc = independent
rate ( time )= dependent