AQA BIOL2 ~ 21 May 2012 ~ AS Biology

I have had enough of this. going for a quick pre-exam nap. Good luck and remember what the questions/answers were to compare and predict later! good luck everyone

Reply 2601

QTpie118

Original post by rturnbull94

Here you go :smile:

Original post by 4MANU4EVER4

put this in google: aqa as biol 2 jan 12 mark scheme

it's the 2nd link, it's a PDF

hope this helped :smile:

Found it, yay, thanks

Reply 2602

sunny_veggies

2

Original post by AspiringDoctor

Here it is:

Do have a link to the paper aswell?

Reply 2603

Xiomara

18

Original post by Mocking_bird

No significance in the data

Original post by Tikara

It means the results may be due to chance

Thank you!

S.D is probably the one thing I'm not that comfortable on, hope it doesn't come up too much :/

Reply 2604

rturnbull94

1

Original post by sunny_veggies

Do have a link to the paper aswell?

Here you go :smile:

AQA-BIOL2-W-QP-JAN12.pdf973.4KB

Reply 2605

Millyshyn

12

I'd love the 6 marker to be on antibiotics or haemoglobin. It's so easy getting marks on that. I dont think you could say enough about insects for 6 marks to be fair?

Reply 2606

rturnbull94

1

Original post by Millyshyn

I'd love the 6 marker to be on antibiotics or haemoglobin. It's so easy getting marks on that. I dont think you could say enough about insects for 6 marks to be fair?

Insects would be a really good one to get a 6 marker on - there's loads to talk about. I think they'll do it on Mitosis/Meiosis or Ethics on Selective Breeding

(edited 11 years ago)

Reply 2607

Nucleo

Original post by Millyshyn

I'd love the 6 marker to be on antibiotics or haemoglobin. It's so easy getting marks on that. I dont think you could say enough about insects for 6 marks to be fair?

Haemoglobin is unlikely as the 6 marker, transport of oxygen came up as the 6 marker in Jan which is basically Hb :tongue:

Reply 2608

samfreak

Original post by rturnbull94

Insects would be a really good one to get a 6 marker on - there's loads to talk about. I think they'll do it on Mitosis/Meiosis or Ethics on Selective Breeding

what would we talk about if it was about ethic on SB? could u give an example?

Reply 2609

The Assassin

18

Original post by Millyshyn

I'd love the 6 marker to be on antibiotics or haemoglobin. It's so easy getting marks on that. I dont think you could say enough about insects for 6 marks to be fair?

I believe Hb was in a fairly recent paper so I don't think it's gonna appear.

But for insects

Waterproof exoskeleton;
rigid to prevent insects drying out;
Spiracles;
limit exposure of respiratory surface
(spiracles) are sunken;
so traps moist air;
lead to trachea which branch into tracheoles;
cuticle lined so water is only lost via tracheoles;
ventilation;
mass movements of air into tracheoles;
oxygen diffuses directly into cells;
Small SA to Vol ratio;
(I'm not sure if this bit is correct it's mentioned in some notes):
production of lactic acid when insects fly;
which lowers WP;
water enters via osmosis;
so diffusion of oxygen quicker

(edited 11 years ago)

Reply 2610

Nucleo

Original post by samfreak

what would we talk about if it was about ethic on SB? could u give an example?

For:
- Produce animals/plants with high yield. eg Cows which produce more milk than usual.
- Produce animals/plants which are resistant to disease (less pesticides/drugs need to be used).
- Produce animals with a resistance to a particular climate.

Against:
- Reduces genetic diversity as animals/plants with only similair traits, therefore similair alleles being used, reduces the gene pool, hence less diversity.
- Can have a negative effect on the animals health.

Easy marks there! :biggrin:

Reply 2611

Tikara

Original post by The Assassin

I believe Hb was in a fairly recent paper so I don't think it's gonna appear.

But for insects

Waterproof exoskeleton;
rigid to prevent insects drying out;
Spiracles;
limit exposure of respiratory surface
(spiracles) are sunken;
so traps moist air;
lead to trachea which branch into tracheoles;
cuticle lined so water is only lost via tracheoles;
ventilation;
mass movements of air into tracheoles;
oxygen diffuses directly into cells;
Small SA to Vol ratio;
(I'm not sure if this bit is correct it's mentioned in some notes):
production of lactic acid when insects fly;
which lowers WP;
water enters via osmosis;
so diffusion of oxygen quicker

Sh*t I didn't know about the lactic acid - thanks alot!

Reply 2612

Jack_Smith

8

I doubt ethical implication would be a 6 marker..i think it would be on insects on how plant leaves are adapted to efficient gas exchange

Reply 2613

R10T_N0_B0UNTY

12

Original post by coolcric321

They have not been set yet. Only when people have done the paper and the papers have been marked they can set them, as they are proportional to how hard/easy the paper was. Grade boundaries are usually released one day before results day.

I know but how many marks do you generlly need to get per say a grade A etc.... :smile:

Its been quite high last year but i dunno

Reply 2614

Bullet Knuckle

14

guys lm off to school, on a piece of wood with wheels, wish me luck and good luck to you too !!!

Reply 2615

bbk.momen

Original post by R10T_N0_B0UNTY

I know but how many marks do you generlly need to get per say a grade A etc.... :smile:

Its been quite high last year but i dunno

Probably 68/85 would be an A without any external influences.

Reply 2616

Nucleo

Original post by R10T_N0_B0UNTY

I know but how many marks do you generlly need to get per say a grade A etc.... :smile:

Its been quite high last year but i dunno

Uhm due to the way AQA write these papers... they are usually around 60 for an A.... i'd say on average if you get 68-ish/85 you definitely have an A... although who knows... maybe paper is really hard or really tough which changes it completely :tongue:

Reply 2617

wiwdhsdsd

Can anyone explain quick what apoplastic and symplastic pathway are ?

Reply 2618

QTpie118

Original post by The Assassin

I believe Hb was in a fairly recent paper so I don't think it's gonna appear.

But for insects

Waterproof exoskeleton;
rigid to prevent insects drying out;
Spiracles;
limit exposure of respiratory surface
(spiracles) are sunken;
so traps moist air;
lead to trachea which branch into tracheoles;
cuticle lined so water is only lost via tracheoles;
ventilation;
mass movements of air into tracheoles;
oxygen diffuses directly into cells;
Small SA to Vol ratio;
(I'm not sure if this bit is correct it's mentioned in some notes):
production of lactic acid when insects fly;
which lowers WP;
water enters via osmosis;
so diffusion of oxygen quicker

I might be wrong, but don't insects have a LARGE surface area to volume ratio?

Reply 2619

Nucleo

Original post by wiwdhsdsd

Can anyone explain quick what apoplastic and symplastic pathway are ?

Symplastic - Through the living parts of cells. Through the cytoplasm, cells connected through plasmodesmata.

Apoplats - Through the non-living parts of cells. Through the cell walls.

Make note - When the apoplast reaches the endodermis cells, there is a waxy strip in the cell walls which block it, hence the symplast must be taken.

AQA BIOL2 ~ 21 May 2012 ~ AS Biology

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