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AQA Biol4 15th June 2012

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what did everyone get for the that bio-fuel question why is it negative, i wrote that
bio ethanol is renewable and as co2 is released , its taken back via the crop, :frown:

, dont know if its right

I think I put..

No net gain of carbon;
More carbon taken in in photosynthesis than given out in combustion of the fuel;
Value has lower NLP than petroleum and therefore is expressed as a negative percentage.

Kinda?

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Reply 1061

asaaal

Original post by kingam

what did everyone get for the that bio-fuel question why is it negative, i wrote that
bio ethanol is renewable and as co2 is released , its taken back via the crop, :frown:

, dont know if its right

i said that as it was made from plants the plants that was used for the biofeul that took up co2 for photosynthesis and removed it from the air and the amount that was saved by using it in combustion overall that released co2 had a low value overall ... in exam style wording though hahah

Reply 1062

Charter

Original post by kingam

scientists dont know about the costs dont know about the yield too, was a guess probably wrong

May be concerned the predator turns to a pest themselves.

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Reply 1063

kingam

Original post by Charter

got similar points as you, kinda differently worded

Reply 1064

CupcakeFaerie

D: That paper wasn't nice :frown:

There was the occasional nice question such as 'what is a community?' and the first few questions...then BAM the rest of the paper except the last couple of questions went straight over my head.

Praying for lower grade boundaries, I don't want to get a D again :frown:

Reply 1065

Charter

Original post by kingam

got similar points as you, kinda differently worded

Good

as long as its a general jist I guess?

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Reply 1066

sablarrr

For 5e. was it something to do with predators get killed by pesticide, less predation therefore increase in pests?

Reply 1067

Charter

Original post by sablarrr

For 5e. was it something to do with predators get killed by pesticide, less predation therefore increase in pests?

I put something like:

Predators affected/wiped out and killed by the chemical;
Pests themselves resistant to thrive.

OR

Very few pests are resistant, so major fall in their population;
Thus lower food source for predator, so these are completely killed;
Resistance gene advantageous so is passed on and with no predator the population rapidly increases.

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Reply 1068

kingam

what did everyone get for that question about keeping temperature constant, i talked about temperature will affect the rate of respiration and also results can be compared

Reply 1069

Charter

Original post by kingam

what did everyone get for that question about keeping temperature constant, i talked about temperature will affect the rate of respiration and also results can be compared

Said:

To ensure only one Independent variable is measured and present;
Temperature therefore controlled;
To ensure fair test and valid results;
As temperature changes affect enzyme activity/rate of respiration etc
And may cause denaturation.

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Reply 1070

kingam

Original post by Charter

it was only two marks lol, are my points valid i think its enough for two marks

Reply 1071

asaaal

Original post by kingam

what did everyone get for that question about keeping temperature constant, i talked about temperature will affect the rate of respiration and also results can be compared

same

and just ranted on a bit about enzymes in e.g during glycolysis and denaturation and kinetic energy in regards to e-s complexes to cover every enzymey possible point ahhaha

never know what these people want uigefifeueiod :angry:

(edited 11 years ago)

Reply 1072

F1's Finest

Original post by asaaal

i got 92000.. in the dark which means the light dependent stage basically i.e the grana so only the light independent stage will occur i.e the stroma hence you just take it away from the 96000

yeah i went by that logic too, but loads on here are saying that it's 4000.

Stroma and Grana is 96000

Stroma on it's own is 4000

So if theres no light, you can eliminate the Grana, which just gives you the stroma of 4000 if that makes any sense. No wonder they got 4000!

Reply 1073

asaaal

Original post by James A

wait im confused haha you say you get the logic then you say its 4000
hahahah :eek:

Reply 1074

Charter

Original post by kingam

it was only two marks lol, are my points valid i think its enough for two marks

I would think so :smile:

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Reply 1075

Charter

Original post by asaaal

wait im confused haha you say you get the logic then you say its 4000
hahahah :eek:

Are you sure that answer can't be given by NOT giving a quantitative answer...?

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Reply 1076

F1's Finest

What do you guys reckon the grade boundaries will be.

I think very similar to Jan 2012.

My guess is
51 for an A.
46 for a B
42 for a C

Reply 1077

F1's Finest

Original post by asaaal

wait im confused haha you say you get the logic then you say its 4000
hahahah :eek:

my logic was wrong in the exam :teehee:

Reply 1078

asaaal

Original post by Charter

Are you sure that answer can't be given by NOT giving a quantitative answer...?

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now thats a silly question charter! this is ocr were talking about, wouldn't surprise me if you had to draw a pig for the answer

so maybe the answer was actually qualitative !!

Reply 1079

Charter

Original post by James A

What do you guys reckon the grade boundaries will be.

I think very similar to Jan 2012.

My guess is
51 for an A.
46 for a B
42 for a C

It was 50 for an A in Jan12. So I reckon it'll be about 48 for an A this time round, a bit lower not higher!

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