A2 Biology | Post your doubts here

[larina]

yeah I got A in my bio AS last year and isA i hope for 85+ in this paper so like this can i get A* ISa??
hope this to u also, how did u do in the AS??

Yes you can!!
I got A in AS too. InshaAllah hoping for A* or A

 

[omar hazem]

I hope so, i hope paper 5 will be easy isA
where will u attend college isA??

 

[larina]

I hope so, i hope paper 5 will be easy isA
where will u attend college isA??

InshaAllah!!
I'll be going to pak to a medical university InshaAllah

 

[larina]

pakistan??
i will be going isA to egypt

yep

 

[omar hazem]

good luck

 

[jumana94]

variant 1 today bio ppr 4

omar hazem? our GIS omar hazem? hala walla
how did u do? it was really long! i was bothered by the immune response question from the AS! i totally dint remember it :/

 

[omar hazem]

please any tips and notes to help me in preparing for the coming bio paper 5??
i would be so thankful

 

[MysteRyGiRl]

please any tips and notes to help me in preparing for the coming bio paper 5??
i would be so thankful

m doing da pastpapers.... the chi squared thing is important

 

[MysteRyGiRl]

um can any1 plz tell me da diference between da dependant and undependant variables plz??

 

[angelgirl:)]

um can any1 plz tell me da diference between da dependant and undependant variables plz??

independent variable....the value which is dependent on the experimenter to change...eg u want to know the rate of photosyntesis based on temperature...so its in ur hand to carry out ur expriment by taking different values of temperature so this value will be always on the x-axis of the graph...but the rate of photosyntheis is dependent on the temperature value...e.g. if temperature is high the rate of photosyntheis is high ...if the temp is low the rate will be low...so rate will be the dependent variable and its always plotted on the y-axis...by keeping all the other factors constant...
hope u get this...i cant explain it in any diff. way...

 

[MysteRyGiRl]

independent variable....the value which is dependent on the experimenter to change...eg u want to know the rate of photosyntesis based on temperature...so its in ur hand to carry out ur expriment by taking different values of temperature so this value will be always on the x-axis of the graph...but the rate of photosyntheis is dependent on the temperature value...e.g. if temperature is high the rate of photosyntheis is high ...if the temp is low the rate will be low...so rate will be the dependent variable and its always plotted on the y-axis...by keeping all the other factors constant...
hope u get this...i cant explain it in any diff. way...

ohh got it thnx loadzz

 

[MysteRyGiRl]

http://www.xtremepapers.com/papers/...and AS Level/Biology (9700)/9700_w08_qp_5.pdf
any1 explain da 2nd question b part??? :/

 

[hassam]

well for b part 1 ....sum up all the number and divide by 20...dats simple mean calculation
and next is also simple with n being 20....the next whenn.....no. of degrees of freedom is n-1 if only one set of data.....n1+n2-2...if two sets of data and so on....!!!

 

[hassam]

well@user cn u amke a sticky thread for BIO PAPER 5
Mystery girl......why they are not allowing 3 dp for that question,,,,i gave two 3 s.f tand that was automatically to 3dp in dat case.....

 

[hassam]

well http://www.xtremepapers.com/papers/...and AS Level/Biology (9700)/9700_w08_qp_5.pdf
q2 b (iv)

cn smone tell why 20 is a closer valuee to 19 rather than 18.....wTH the ER means here........both are same distance from 19.......is it a convention.......to use the larger value.....and one more question.......well one more thing....i dont understand why we use 0.05 as the reference ....we say if probability of null hypothesis being correct is greater than 0.05 .....null hypothesis is accepted.....isnt it too low.....or am i missing sth.....

 

[usmiunique]

There is something related to the data being in the range of mean +/- standard deviation. Actually standard deviation means that the 95% of the data is within the range of mean-s.d.and mean+s.d.. I don't know why exactly we use 0.05 but it is derived from this expression by 1-0.95(the probabality of the data being in the standard deviation range)

 

[confused_soul]

Can sum bdy pleaseeee explain me tyical bio p5 questions in which we hav to do T n chi test
I dont get it all

 

[smartangel]

can anyone explain standard error please? and error bars,..theres a question on it in specimen paper but i cant find that online. if anyone has it plz post it so that i can exactly refer to the question.

 

[Paradoxical]

can anyone explain standard error please? and error bars,..theres a question on it in specimen paper but i cant find that online. if anyone has it plz post it so that i can exactly refer to the question.

Do you have the CIE biology revision guide? If you do, there's a bit about paper 5 in it where it explains all the statistical tests.

 

[smartangel]

Do you have the CIE biology revision guide? If you do, there's a bit about paper 5 in it where it explains all the statistical tests.

yeah i do. okay i'll go over it. thanks