AQA A2 Biol4 January 2012 pre- exam discussion

On the spec paper mark scheme it says on Q6,a) ii "Give credit for any method which would ensure collection of a random
sample from trees e.g. beating tray" But surely a beating tray wouldn't collect a sample which is completely random as the organisms which cannot hold on to the tree or plant as well as others will drop into the beating tray more easily so each organism does not have an equal chance of being caught.

Reply 301

NutterFrutter

Original post by chill543

are teacher always says that the spec papers are never checked neither so, that ups the anti a little bit and possibly wouldnt worry....

What do you mean "never checked"?

Reply 302

EffKayy

16

Slightly confused in terms of revision.
Do we need to know about the structure of the leaf/adaptations etc?
It was in the AQA NT book, but not explicitly stated in the spec.

Reply 303

Sam-8

Hey, just wondering if someone could give me a little help, I'm stuck on questions:
3 bi, and 4 a ii, I know for 3bi, that its curve 3 but I don't understand how you work out the answer of 85 :s-smilie:

and for 4 I get the answers apart from the running mean and it also says when enough quadrats this shows little chane/ levels out if plotted as a graph. Could anyone explain the process and what is a running mean please???

Thanks in advance, Sam.

http://store.aqa.org.uk/qual/gce/pdf/AQA-BIOL4-W-QP-JAN10.PDF

(edited 12 years ago)

Reply 304

Heyimdec

8

Original post by AmbitiousMedic

Is it me or did anyone else find the Specification paper really hard :/

Yeah I got 54% -.-

On the other hand, I did June 2011 yesterday and got 64% :biggrin:

Reply 305

Rahmeh.

18 days left :|
I hope we don't get any questions on statistics!

Reply 306

Besakt

3

Original post by Sam-8

Hey, just wondering if someone could give me a little help, I'm stuck on questions:
3 bi, and 4 a ii, I know for 3bi, that its curve 3 but I don't understand how you work out the answer of 85 :s-smilie:

and for 4 I get the answers apart from the running mean and it also says when enough quadrats this shows little chane/ levels out if plotted as a graph. Could anyone explain the process and what is a running mean please???

Thanks in advance, Sam.

Like to website with paper on (sorry my phone only saves the pdf and won't let me link it): http://www.aqa.org.uk/qualifications/a-level/science/biology/biology-key-materials

Which paper? The link just sends me to the AQA past paper page.

Reply 307

AmbitiousMedic

6

Original post by EffKayy

Slightly confused in terms of revision.
Do we need to know about the structure of the leaf/adaptations etc?
It was in the AQA NT book, but not explicitly stated in the spec.

I think they could throw in a question about photosynthesis/limiting factors and if carbon dioxide concentration is in there then possibly the structure of the leaf or how it's adapted for efficient diffusion of gases could come up?

Reply 308

AmbitiousMedic

6

Original post by Heyimdec

Yeah I got 54% -.-

On the other hand, I did June 2011 yesterday and got 64% :biggrin:

That's a big increase :tongue:

Hopefully the specimen paper was just harder than all the others as it was the first paper they wrote.. :smile:

Reply 309

Besakt

3

Original post by Rahmeh.

18 days left :|
I hope we don't get any questions on statistics!

I just hope the ecology questions aren't so vague.

It's so frustrating when they have such vague questions but want very specific answers.

Reply 310

Kidneyjean

7

Original post by Rahmeh.

18 days left :|
I hope we don't get any questions on statistics!

They'll never ask you to calculate anything in BIOL4, only interpret correlation coefficients, probabilities etc. :smile:

(the calculating joy is saved for the EMPA/ISA)

Reply 311

Sam-8

Original post by Besakt

Which paper? The link just sends me to the AQA past paper page.

http://store.aqa.org.uk/qual/gce/pdf/AQA-BIOL4-W-QP-JAN10.PDF

Reply 312

Besakt

3

Original post by Sam-8

http://store.aqa.org.uk/qual/gce/pdf/AQA-BIOL4-W-QP-JAN10.PDF

For 4aii this explains running mean
http://www.theseashore.org.uk/theseashore/Stats%20for%20twits/How%20big%20a%20sample.html

http://www.discover.ltd.uk/downloads/examples/StudyingEcologyandEcosystemsEdexcel_2009.pdf (bottom of page 9)

3bi You use curve C, then you see when there is half the number of survivors which are still alive which (10000/2) which gives 5000, then you just read off from 5000 which gives you 85.

Reply 313

username582481

Original post by Sam-8

Hey, just wondering if someone could give me a little help, I'm stuck on questions:
3 bi, and 4 a ii, I know for 3bi, that its curve 3 but I don't understand how you work out the answer of 85 :s-smilie:

and for 4 I get the answers apart from the running mean and it also says when enough quadrats this shows little chane/ levels out if plotted as a graph. Could anyone explain the process and what is a running mean please???

Thanks in advance, Sam.

http://store.aqa.org.uk/qual/gce/pdf/AQA-BIOL4-W-QP-JAN10.PDF

I dont get 3bi either, but for 4aii, its like this: when you plot your graph, instead of plotting the value you get at that quadrat, you plot the cumulative value, i.e. each time you plot a point, you add the previous values to it as well, and then plot the point. so you get an increasing curve, but eventually, it will level off.

does that make sense?

Reply 314

Sam-8

Original post by Besakt

For 4aii this explains running mean
http://www.theseashore.org.uk/theseashore/Stats%20for%20twits/How%20big%20a%20sample.html

http://www.discover.ltd.uk/downloads/examples/StudyingEcologyandEcosystemsEdexcel_2009.pdf (bottom of page 9)

3bi You use curve C, then you see when there is half the number of survivors which are still alive which (10000/2) which gives 5000, then you just read off from 5000 which gives you 85.

ah right, thanks mate, much appreciated. :smile:

Reply 315

Starlight94

I genuinly hate this unit, i find it so difficult, hopefully i'll not get a U

Reply 316

Heyimdec

8

The January 2010 paper is horrible. I'm struggling to answer 60% of the questions. :\

Reply 317

EffKayy

16

Just went over Jan2011 -lol.

Predictions for the longer answer questions? I think it'll be respiration :smile:

Reply 318

Sam-8

Original post by EffKayy

Just went over Jan2011 -lol.

Predictions for the longer answer questions? I think it'll be respiration :smile:

I hope so, that would be nice. What has been up before? I take it respiration hasn't, has photosynthesis?

Reply 319

chill543

Original post by NutterFrutter

What do you mean "never checked"?

i mean like the answers that the examiners give are never the checked over to see if they are actually the right answers and a teacher hasnt mate a mistake. i dont know if its true or not. but apparently it is

AQA A2 Biol4 January 2012 pre- exam discussion

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