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BIOL4 Biology Unit 4 Exam - 13th June 2011

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The hardest part of this paper is actually trying to decipher what the question's actually asking of you...! Stupid AQA...grrr
Original post by tehsponge
I find the hardest thing is the timing. In all the mocks I've done I never have time to check my answers, and I'm usually still writing as the time finishes...


same here. u have to read the question about 5 times before u know what they are asking you then again you are still not sure.
Can someone list all the equations we need to work out maths problems for tomorrows exam..
+rep :smile:
Original post by INeedToRevise
Can someone list all the equations we need to work out maths problems for tomorrows exam..
+rep :smile:


hardy weinberg.

first capture * second capture / total marked in second capture thats it really
Original post by User12399
same here. u have to read the question about 5 times before u know what they are asking you then again you are still not sure.


I know :frown: and its meant to be a minute a mark. Its more like 5 minutes to understand the ****ing data then another 5 to formulate an answer....
Original post by tehsponge
I know :frown: and its meant to be a minute a mark. Its more like 5 minutes to understand the ****ing data then another 5 to formulate an answer....


SO we probably should skip the question if took us more than 2 mins ! But then again it depends on the question..some question worth the time you spend on

I have been told to do last 2 question at the beginning :rolleyes:
Reply 446
Avatar for Abby :)
Abby :)
8
Just redoing the Jan 11 paper that i got an E in january on.... and still not finding it any easier than the first time.
Im going to fail again tomorrow, i know the content i just hate how science works questions urgh. I want to cry!

Hugs and moral support needed please. Hahaha
Reply 447
Avatar for Tericon
Tericon
8
Original post by INeedToRevise
Can someone list all the equations we need to work out maths problems for tomorrows exam..
+rep :smile:


Hardy Weinburg = q + p = 1 This is used to calculate frequency of alleles in a pop

frequency of genotype = p^2 + 2pq + q^2 = 1

Mark release recapture = Number in sample 1 x number in sample 2/ number of marked in sample 2

Percentage Increase: final value - intial value/intial x 100
Percentage Decrease: intial value - final value/intial x 100

Rate of change: change/time
Can someone please give me give advantages and disadvantages of chemical pesticides.

Thanks :smile:
Reply 449
Avatar for Thepupil
Thepupil
Original post by Master.K
Can someone please give me give advantages and disadvantages of chemical pesticides.

Thanks :smile:


Advantages : It's quick.

Disadvantages : Not very specific, can effect other species which you do not want to. You have to reapply it. It's expensive. Pests can become resistant.

Can't think of many other advantages. :smile: Hope that helps
Original post by User12399
hardy weinberg.

first capture * second capture / total marked in second capture thats it really


There is definitely more than that. I'll make the list then.

Birth rate= Number of births per year/total population in the same year x 1000
Death rate= Number of deaths per year/total population in the same year x 1000
Population growth= (Births+Immigration) - (Deaths+Emigration)
Population percentage growth rate= Population change during period/ population at the start of the period.
Hardy Weinberg= p+q=1 psquared +qsquared + 2pq=1
Net productivity= gross productivity- respiratory losses
Energy transfer= energy available after/energy available before x100
Mark release recapture= first sample*second sample/marked individuals
Rate of change= change/time
Percentage Increase= final value - intial value/intial x 100
Percentage Decrease= intial value - final value/intial x 100
(edited 12 years ago)
Original post by Tericon
Hardy Weinburg = q + p = 1 This is used to calculate frequency of alleles in a pop

frequency of genotype = p^2 + 2pq + q^2 = 1

Mark release recapture = Number in sample 1 x number in sample 2/ number of marked in sample 2

Percentage Increase: final value - intial value/intial x 100
Percentage Decrease: intial value - final value/intial x 100

Rate of change: change/time


Thanks. I'll add it to my list :smile:
Reply 452
Avatar for empop92
empop92
5
Original post by Master.K
Can someone please give me give advantages and disadvantages of chemical pesticides.

Thanks :smile:


ermm advantages - they kill pests lol, are specific to one pest
disadvantages: genetic resistance therefore need to be reapplied, not all pests killed, can build up in food chain.. could kill other thingies

im hoping this doesn't come up tomorrow lol
Original post by INeedToRevise
There is definitely more than that. I'll make the list then.

Birth rate= Number of births per year/total population in the same year x 1000
Death rate= Number of deaths per year/total population in the same year x 1000
Population growth= (Births+Immigration) - (Deaths+Emigration)
Population percentage growth rate= Population change during period/ population at the start of the period.
Hardy Weinberg= p+q=1 psquared +qsquared + 2pq=1
Net productivity= gross productivity- respiratory losses
Energy transfer= energy available after/energy available before x100
Mark release recapture= first sample*second sample/marked individuals
Rate of change= change/time
Percentage Increase= final value - intial value/intial x 100
Percentage Decrease= intial value - final value/intial x 100


Thanks.....repped. :smile:
hey guys hwz revizion goin. i cnt revze cz i fink im jst gna get a U agian. dnt knw wat aqa want. i even revized and gt a U in jan
any help plz
Original post by INeedToRevise
There is definitely more than that. I'll make the list then.

Birth rate= Number of births per year/total population in the same year x 1000
Death rate= Number of deaths per year/total population in the same year x 1000
Population growth= (Births+Immigration) - (Deaths+Emigration)
Population percentage growth rate= Population change during period/ population at the start of the period.
Hardy Weinberg= p+q=1 psquared +qsquared + 2pq=1
Net productivity= gross productivity- respiratory losses
Energy transfer= energy available after/energy available before x100
Mark release recapture= first sample*second sample/marked individuals
Rate of change= change/time
Percentage Increase= final value - intial value/intial x 100
Percentage Decrease= intial value - final value/intial x 100


Whos awesome? You're awesome!
Original post by empop92
ermm advantages - they kill pests lol, are specific to one pest
disadvantages: genetic resistance therefore need to be reapplied, not all pests killed, can build up in food chain.. could kill other thingies

im hoping this doesn't come up tomorrow lol


Be careful here. Chemical pesticides aren't very specific as they can have an effect on non target species. Whereas Biological agents are specific.
Original post by INeedToRevise
There is definitely more than that. I'll make the list then.

Birth rate= Number of births per year/total population in the same year x 1000
Death rate= Number of deaths per year/total population in the same year x 1000
Population growth= (Births+Immigration) - (Deaths+Emigration)
Population percentage growth rate= Population change during period/ population at the start of the period.
Hardy Weinberg= p+q=1 psquared +qsquared + 2pq=1
Net productivity= gross productivity- respiratory losses
Energy transfer= energy available after/energy available before x100
Mark release recapture= first sample*second sample/marked individuals
Rate of change= change/time
Percentage Increase= final value - intial value/intial x 100
Percentage Decrease= intial value - final value/intial x 100


surely some of the basic ones like % changes you can do from KS2 and rate of change. Also birth rate and death rate is just a calculation using common sense.
Reply 458
Avatar for Thepupil
Thepupil
Original post by godfather123
hey guys hwz revizion goin. i cnt revze cz i fink im jst gna get a U agian. dnt knw wat aqa want. i even revized and gt a U in jan
any help plz


Well you're going to get a U if you write like that in the exam :wink:

Just think more positively and revise. Read the questions and data properly and you should be fine.
Original post by Thepupil
Well you're going to get a U if you write like that in the exam :wink:

Just think more positively and revise. Read the questions and data properly and you should be fine.


thanks! i shd be a bit more psoitive.

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