All AQA iGCSE Sciences (summer 2013) discussion

Hi guys,
just thought I would make a thread including all the sciences for AQA iGCSE so we can discuss pre or post exams and evaluate difficulties of exams and rough estimations of grade boundaries and mark schemes. Thanks- good luck
:smile:

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Reply 1

Nerd44

What other hard questions on biology?

Reply 2

Hamish_wells

Hard questions I felt were decay, bacteria/potato trend and eutrophication

Reply 3

Nerd44

Eutrophication was just recall? What about on the skin cancer , what do you reckon will be the mark scheme for two graph questions

Reply 4

LookIts_Liam

Original post by Nerd44

Eutrophication was just recall? What about on the skin cancer , what do you reckon will be the mark scheme for two graph questions

I wrote a massive essay for both of those questions but i think all you had to do was describe the trends in the graph, give a few examples from points on the graph, notice the trend between going on holiday and people with the melanoma, and for the explain why question just say that people tend to go on holiday to places with sun, and if they aren't wearing sun cream they'll be more susceptible to penetration from uv light which could trigger fast division of skin cells, causing the melanoma

Reply 5

matchstickhouses

I completely messed up the melanoma skin cancer one, I had to re-write it like, three times -.- I missed out chemical diffusion at synapses on the CNS question too

Posted from TSR Mobile

Reply 6

matchstickhouses

What did everyone else write for the potato one? I said it was to do with enzymes but I don't actually know

Posted from TSR Mobile

Reply 7

LookIts_Liam

Original post by matchstickhouses

I completely messed up the melanoma skin cancer one, I had to re-write it like, three times -.- I missed out chemical diffusion at synapses on the CNS question too

Posted from TSR Mobile

i wouldn't worry, it'll lose you max 1 mark :smile:

Reply 8

LookIts_Liam

Original post by matchstickhouses

What did everyone else write for the potato one? I said it was to do with enzymes but I don't actually know

Posted from TSR Mobile

i believe i wrote something about the microorganism ingesting some of the potato so it could break it down into nutrients, and to do this it has to respire, so the process of respiration release carbon dioxide which contains carbon which is necessary for carbohydrates, but i think i got it wrong...

Reply 9

amyhall

Original post by Hamish_wells

what is arough grade for b

Reply 10

FergusJVL

Ive definitely got mixed feelings about this one... Exam technique always seems to trip me up but no one knows what will happen a it's the first year! Good luck in chemistry what do you guys think will come up? There's so much to learn...

Reply 11

King Amukee

apparently the 6 mark question wasn't about eutrophication because it was a flowing stream? :s-smilie:

SS

also did you guys get 37.5% for the percentage change of MRSA?

Reply 12

richardsondpu

Original post by King Amukee

apparently the 6 mark question wasn't about eutrophication because it was a flowing stream? :s-smilie:

SS

also did you guys get 37.5% for the percentage change of MRSA?

cant eutrophication also happern in small streams though

Reply 13

King Amukee

Original post by richardsondpu

cant eutrophication also happern in small streams though

That's what I'm hoping, or it's six marks down the drain xD

Reply 14

richardsondpu

look at pic at the top
http://en.wikipedia.org/wiki/Eutrophication

Reply 15

richardsondpu

nah wikipedia said it can happen in streams

Reply 16

LookIts_Liam

Original post by King Amukee

That's what I'm hoping, or it's six marks down the drain xD

There's nothing else on the syllabus that the question could have been relating to, and it talks about the effects on plants and invertebrates, so it had to be :smile:

Reply 17

richardsondpu

plus first year so low grade boundary