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emah123
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#941
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#941
(Original post by Teffie123)
What did people put as answers for the enzyme Questions; something about why is Triose Phosphate lower in Iron Deficiency plants?
i dont know if this is right: 1)prevents transport of electrons so no atp and reduced nad produced 2) therefore no gp to tp 3) because requires atp for energy and nad for reduction

couldnt think of what else to write what did you put?
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master y
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#942
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#942
(Original post by erica42)
how many marks would you lose for putting 6% instead of 6.12%?
no marks, i think that's fine
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Son234
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#943
(Original post by Teffie123)
What did people put as answers for the enzyme Questions; something about why is Triose Phosphate lower in Iron Deficiency plants?
The question was I think why was there a decrease in the uptake of carbon dioxide?

2 marks

My answer was less GP converted to TP

Less TP converted to RuBP in the light independent reactions

Not sure if thats right :/


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stoppy123
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#944
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#944
Absolutely lovely paper!

Got around 6% ish on hardy weinberg.
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Gcayte
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#945
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#945
(Original post by lala12)
Stuff about how less ATP made as electron transport chain in light dependent reaction would slow down, and also less NADPH formed as electron transport reduced. Then this would mean that less ATP and NADPH available to reduce GP to TP and so less TP made.
I put this but put NAD instead of NADP, will I lose all the marks or just one or two?
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stoppy123
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#946
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#946
(Original post by Son234)
The question was I think why was there a decrease in the uptake of carbon dioxide?

2 marks

My answer was less GP converted to TP

Less TP converted to RuBP in the light independent reactions

Not sure if thats right :/


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I put that there is less GP to TP so less GP is required meaning less CO2 is required to make GP
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fajitamunch
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#947
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#947
(Original post by erica42)
how many marks would you lose for putting 6% instead of 6.12%?
I put 6% as well because it didn't ask for dp or sf. Looking at past papers, we should be alright as for the answers with decimal points they've put the rounded number, and the decimals in brackets, e.g 42(.32) That sort of thing.
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amychan
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#948
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#948
(Original post by TH4RG3)
No I dont think so it specifically said advantages of the mixed (integrated ot said didnt it?) system. It didnt ask for sperate advantages

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what if I wrote a short conclusion at the end, saying we get both benefits while using an integrated systems? (I think I wrote 3-4 benefits again there) Do you think I will get 2 marks? How many marks is this question?


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Son234
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#949
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#949
(Original post by stoppy123)
I put that there is less GP to TP so less GP is required meaning less CO2 is required to make GP
Less RuBP to combine with Co2 thus uptake decreases was how I concluded I think were both okay


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amychan
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#950
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#950
will anyone upload an unofficial mark scheme?


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laser174572
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#951
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#951
Shall we start on an unofficial marks scheme? I can't remember many questions but here are those that I can and my best fesses at marking points :

1 a) What information is needed to calculate the growth rate of a population? (2)
- Birth and death rates
- Immigration and emmigration rates
b) How does the graph show that it is in the early stages of a demographic transition? (2)
- Low life expectancy
- High death and birth rates

2 a) Which species is the pioneer? (1)
- U. Lactulana (something like that anyway)


5 c) (?) The rate of the condition in a population was 1 in 1000. What would you expect the percentage of heterozygous individuals to be?
q^2 = 0.001, q = 0.0316, p= 0.9683, 2pq= 0.0612 = 6.12%

6 a) Explain how fragmentation of the Amazon rainforest in the past led to high species diversity in the current day (5)
- Initially there is variety
- Due to mutation
- Geographic isolation as forest fragments.
- Different selection pressures
- Different alleles selected for, differential reproductive success
- Frequency of different alleles increases in the different populations.
- When the areas become linked once again the species are genetically isolated and can no longer breed - they are different species

Im working on 8 atm...
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stoppy123
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#952
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#952
(Original post by amychan)
what if I wrote a short conclusion at the end, saying we get both benefits while using an integrated systems? (I think I wrote 3-4 benefits again there) Do you think I will get 2 marks? How many marks is this question?


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I think you'd get a few marks out of the 6.

But I think you're supposed to say how the weaknesses of biological agents/pesticides are then countered by biological agents/pesticides strengths
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Gcayte
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#953
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#953
(Original post by amychan)
what if I wrote a short conclusion at the end, saying we get both benefits while using an integrated systems? (I think I wrote 3-4 benefits again there) Do you think I will get 2 marks? How many marks is this question?


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The question was 6 marks. I think aslong as you've done a conclusion about the combined techniques then you should get at least 3/4ish? I'm not sure though.
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v15hu1
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#954
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#954
Anyone willing to make an unofficial mark scheme?


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stoppy123
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#955
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#955
(Original post by laser174572)
Shall we start on an unofficial marks scheme? I can't remember many questions but here are those that I can and my best fesses at marking points :

1 a) What information is needed to calculate the growth rate of a population? (2)
- Birth and death rates
- Immigration and emmigration rates
b) How does the graph show that it is in the early stages of a demographic transition? (2)
- Low life expectancy
- High death and birth rates

2 a) Which species is the pioneer? (1)
- U. Lactulana (something like that anyway)


5 c) (?) The rate of the condition in a population was 1 in 1000. What would you expect the percentage of heterozygous individuals to be?
q^2 = 0.001, q = 0.0316, p= 0.9683, 2pq= 0.0612 = 6.12%

6 a) Explain how fragmentation of the Amazon rainforest in the past led to high species diversity in the current day (5)
- Initially there is variety
- Due to mutation
- Geographic isolation as forest fragments.
- Different selection pressures
- Different alleles selected for, differential reproductive success
- Frequency of different alleles increases in the different populations.
- When the areas become linked once again the species are genetically isolated and can no longer breed - they are different species

Im working on 8 atm...
2b Explain how succession happens using examples.
- Colonization of Whatever
- Makes environment change
- Allows other whatever species to colonize
- Which change the environment to make it less hostile and more stable
- Which allows other species which are more adapted to colonize
- Climax
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Son234
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#956
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#956
For the first question is

growth rate= (birth rate + death rate) - (emigration + immigration)

Worthy of 2 marks ://


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TH4RG3
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#957
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#957
(Original post by laser174572)
Shall we start on an unofficial marks scheme? I can't remember many questions but here are those that I can and my best fesses at marking points :

1 a) What information is needed to calculate the growth rate of a population? (2)
- Birth and death rates
- Immigration and emmigration rates
I simply put
-Population change over a specific time span
-Original population at start


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stoppy123
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#958
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#958
For the last questions.

8a
- Pesticides work instantly
- Biological agents slow
- Biological agents don't kill all of the pests
- Pesticides do
- Biological agents don't need to be continually applied
- Pesticides do
- Biological agents don't build up resistance
- Pesticides do

That's what I did, I basically said the strengths of one, and that made it combat the weakness of the other
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Gcayte
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#959
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#959
(Original post by Son234)
For the first question is

growth rate= (birth rate + death rate) - (emigration + immigration)

Worthy of 2 marks ://


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No, I think that is the wrong equation.
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master y
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#960
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#960
(Original post by Son234)
For the first question is

growth rate= (birth rate + death rate) - (emigration + immigration)

Worthy of 2 marks ://


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itsnt it (BR + immigration) - (death rate + emi)
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