Right so i'm looking at Question 4 on the unofficial mark scheme, seems you got plantains per m^{2 }at 3.125... I'm kind of thinking otherwise:
Quadrat is 25cm x 25cm = 0.25m x 0.25m = 0.0625m^{2 }is the area of a single quadrat.
0.0625m^{2} x 10 is equal to the area of all 10 quadrats = 0.625m^{2}.
20 plantains across 10 quadrats  20 / 0.625m^{2} = 32 plantains per m^{2}.
32 x area of field (50m x 100m = 5000m^{2}) .
32 x 5000 = 160,000 Plantains on the field (estimate).
I could be absolutely dead wrong, so let me know.
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AQA Biology B2  Unofficial Mark Scheme
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View Poll Results: What do you predict your score?Voters: 954. You may not vote on this poll

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 10062016 14:43
Last edited by JakeHorsey; 10062016 at 15:02.Post rating:1 
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 10062016 14:45
(Original post by Naco88)
I just posted the predicted grade boundaries.
Look in the title thread for them 
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 203
 10062016 14:45
Your quadrat question is wrong. To work out the number of plantains per quadrat. You do total number of organisms which is 20 divided by total number of quadrats which is 10. So 20/10 is 2. Meaning that you have 2 plantains per quadrat. So the total number of plantains in the whole field is 5000 x 2 which 10,100. If you revised the formula this would have been an easy question. Idk why so many people got it wrong.
Post rating:1 
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 204
 10062016 14:48
(Original post by Bledz)
Your quadrat question is wrong. To work out the number of plantains per quadrat. You do total number of organisms which is 20 divided by total number of quadrats which is 10. So 20/10 is 2. Meaning that you have 2 plantains per quadrat. So the total number of plantains in the whole field is 5000 x 2 which 10,100. If you revised the formula this would have been an easy question. Idk why so many people got it wrong. 
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 205
 10062016 14:50
How did everyone work out question 7 where we had to work out the picograms for each cell in the division, starting with 6.6 picograms?

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 206
 10062016 14:53
Could you please put how many marks each question is worth if possible please.
(Original post by Naco88)
↑↑↑ In the poll above, an answer like '> 30%' would mean between '30%' and '40%' ↑↑↑
Remember a question? Post your answers below.
Follow me and I will try and post the answers for the Chemistry and Physics exams on Wednesday and Friday.
a)
AQA B2 Higher  Unofficial Mark Scheme (Updated Regularly) (Should have the last few questions of foundation)1. Athlete Question
i) Anaerobic means respiration without oxygen
ii) The athlete was running for 1.5 minutes.
b) How do you know it was anaerobic respiration?
The athlete produced lactic acid2.Six Mark Question Put the pond weed in the beaker,
 Fill the beaker with water.
 Move the light close to the pond weed,
 Count bubbles in one minute, / Measure oxygen produced
 Note down your results,
 Repeat experiment but move the light closer/further away from the pond weed each time.
 To make it a fair test, use same amount of water, use same length/volume of pond weed, time it for the same length.
3.Enzymes question Circle Question: Cytoplasm.
4. Plantains, Quadrats. To improve their investigation: Use random sampling, take more samples.
I got the number of plantains per square m at 3.125
5.Polydactyly Question
Stem cells are undifferentiated stem cells that can potentially become any cell.
6. Removing bacteria from milk with catalase. Advantages: Catalysts can be reused
 Disadvantages: Enzymes can denature
7. Meiosis & Mitosis. The sperm cells were produced in the testes by Meiosis. The embryo divided by Mitosis.
For the question about the size of each cell: 6.6
 13.2
 6.6
 3.3
Foxes, Geographical isolation. Adapted differently. Mutation, So unable to breed. Different species.
Why were the foxes on the 3 islands varies but still the same species?
The islands have similar conditions so the two species adapted similarly and were so similar they could still interbreed so were still of the same species.
I am not sure what question these answers were for) Muscular tissue contracts and churns food in the stomach
 Epithelial tissue covers the stomach
 Glandular tissue secretes hormones and enzymes
This is a mix of my answers and those of the community but they are not guaranteed to be correct.
Grade Boundary Predictions
These are completely my predictions, we have decided that it was a fairly
easy paper so our boundaries are fairly high.
A*  46 marks
A  37 marks
B  31 marks
C  24 marks
Thanks for using my mark scheme : )(Original post by Naco88)
↑↑↑ In the poll above, an answer like '> 30%' would mean between '30%' and '40%' ↑↑↑
Remember a question? Post your answers below.
Follow me and I will try and post the answers for the Chemistry and Physics exams on Wednesday and Friday.
a)
AQA B2 Higher  Unofficial Mark Scheme (Updated Regularly) (Should have the last few questions of foundation)1. Athlete Question
i) Anaerobic means respiration without oxygen
ii) The athlete was running for 1.5 minutes.
b) How do you know it was anaerobic respiration?
The athlete produced lactic acid2.Six Mark Question Put the pond weed in the beaker,
 Fill the beaker with water.
 Move the light close to the pond weed,
 Count bubbles in one minute, / Measure oxygen produced
 Note down your results,
 Repeat experiment but move the light closer/further away from the pond weed each time.
 To make it a fair test, use same amount of water, use same length/volume of pond weed, time it for the same length.
3.Enzymes question Circle Question: Cytoplasm.
4. Plantains, Quadrats. To improve their investigation: Use random sampling, take more samples.
I got the number of plantains per square m at 3.125
5.Polydactyly Question
Stem cells are undifferentiated stem cells that can potentially become any cell.
6. Removing bacteria from milk with catalase. Advantages: Catalysts can be reused
 Disadvantages: Enzymes can denature
7. Meiosis & Mitosis. The sperm cells were produced in the testes by Meiosis. The embryo divided by Mitosis.
For the question about the size of each cell: 6.6
 13.2
 6.6
 3.3
Foxes, Geographical isolation. Adapted differently. Mutation, So unable to breed. Different species.
Why were the foxes on the 3 islands varies but still the same species?
The islands have similar conditions so the two species adapted similarly and were so similar they could still interbreed so were still of the same species.
I am not sure what question these answers were for) Muscular tissue contracts and churns food in the stomach
 Epithelial tissue covers the stomach
 Glandular tissue secretes hormones and enzymes
This is a mix of my answers and those of the community but they are not guaranteed to be correct.
Grade Boundary Predictions
These are completely my predictions, we have decided that it was a fairly
easy paper so our boundaries are fairly high.
A*  46 marks
A  37 marks
B  31 marks
C  24 marks
Thanks for using my mark scheme : ) 
 Follow
 207
 10062016 14:53
(Original post by poseidons)
How did everyone work out question 7 where we had to work out the picograms for each cell in the division, starting with 6.6 picograms?
B has undergone duplication so: 13.2
C is the initial division: 6.6
D is a gamete following a second division: 3.3Post rating:1 
 Follow
 208
 10062016 14:54
(Original post by JakeHorsey)
Right so i'm looking at Question 4 on the unofficial mark scheme, seems you got plantains per m^{2 }at 3.125... I'm kind of thinking otherwise:
Quadrat is 25cm x 25cm = 0.25m x 0.25m = 0.0625m^{2 }is the area of a single quadrat.
0.0625m^{2} x 10 is equal to the area of all 10 quadrats = 0.625m^{2}.
20 plantains across 10 quadrats  20 + 0.625m^{2} = 32 plantains per m^{2}.
32 x area of field (50m x 100m = 5000m^{2}) .
32 x 5000 = 160,000 Plantains on the field (estimate).
I could be absolutely dead wrong, so let me know.
25 X 25 X 10 = 650 = area of all quadrats in cm^{2}
You then need to divide this total by 100^{2 }as it is in area, which is m^{2}, not m.
This gives us the 0.625m^{2 }that you got and then same method from there.
Edit: it should be 20/0.625=32 plantains per m^{2}. You must have done this as you got the right answer but maybe used the wrong symbol when writing it out.Last edited by adamhulme_; 10062016 at 14:56. Reason: missed something outPost rating:1 
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 209
 10062016 14:54
(Original post by Bledz)
Your quadrat question is wrong. To work out the number of plantains per quadrat. You do total number of organisms which is 20 divided by total number of quadrats which is 10. So 20/10 is 2. Meaning that you have 2 plantains per quadrat. So the total number of plantains in the whole field is 5000 x 2 which 10,100. If you revised the formula this would have been an easy question. Idk why so many people got it wrong. 
 Follow
 210
 10062016 14:55
For the first stage, I realized that if a quadrat was 1m by 1m then it'd be 1M squared.
So 4 of the 25cm quadrats will make 1m squared
8 will make 2 M squared
So the 10 quadrats make 2.5 meters squared all togeather surely? My teacher agreed with me!
If you do 0.25 x 0.25 then your answer will be 25% of 0.25? 
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 211
 10062016 14:55
(Original post by JakeHorsey)
Right so i'm looking at Question 4 on the unofficial mark scheme, seems you got plantains per m^{2 }at 3.125... I'm kind of thinking otherwise:
Quadrat is 25cm x 25cm = 0.25m x 0.25m = 0.0625m^{2 }is the area of a single quadrat.
0.0625m^{2} x 10 is equal to the area of all 10 quadrats = 0.625m^{2}.
20 plantains across 10 quadrats  20 + 0.625m^{2} = 32 plantains per m^{2}.
32 x area of field (50m x 100m = 5000m^{2}) .
32 x 5000 = 160,000 Plantains on the field (estimate).
I could be absolutely dead wrong, so let me know. 
Naco88
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 212
 10062016 14:56
(Original post by 11masanda002)
When will you be able to post a full unpredicted mark scheme with marks for all questions? I really need to see what i think i got! 
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 213
 10062016 14:56
Yeah marks would be helpful???

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 214
 10062016 14:58
Quadrat q is 160000
for all those who got 1600 im sorry
0.25*0.25*10=0.625
if u did 25*25*10 and then divided by 100 thats wrong
if 100cm= 1m
then 10000cm2=1m2
so u do 6250/10000=0.625
20/0.625=32
32*5000=160000
hope you all did well. PeacePost rating:1 
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 215
 10062016 14:58
(Original post by babymarima)
I don't understand how the area of the quadrat can be smaller than one side of the quadrat? 
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 216
 10062016 14:58
How many marks was the quadrant questions?
Posted from TSR Mobile 
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 217
 10062016 14:59
(Original post by Kesavan2000)
For the six mark I wrote basically the experiment (roughly) with a potometer. I said leave it over night... lamp different distances etc. But measure the difference in the water and calculating the amount of water used by the plant in photosynthesis
Someone please tell me I'll get the marks
Posted from TSR Mobile
Hope this helps 
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 218
 10062016 15:00
(Original post by trollface54)
Quadrat q is 160000
for all those who got 1600 im sorry
0.25*0.25*10=0.625
if u did 25*25*10 and then divided by 100 thats wrong
if 100cm= 1m
then 10000cm2=1m2
so u do 6250/10000=0.625
20/0.625=32
32*5000=160000
hope you all did well. Peace 
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 219
 10062016 15:01
Does anyone think the athlete ran for 1 minute because the blood flow stopped increases after this, and it stayed level to repay oxygen debt?
and for the disadvantage of the enzyme, i said the catalase would have a high initial cost? do you think they would accept answers other than it didn't kill all of the bacteria? 
Naco88
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 10062016 15:01
(Original post by JakeHorsey)
Right so i'm looking at Question 4 on the unofficial mark scheme, seems you got plantains per m^{2 }at 3.125... I'm kind of thinking otherwise:
Quadrat is 25cm x 25cm = 0.25m x 0.25m = 0.0625m^{2 }is the area of a single quadrat.
0.0625m^{2} x 10 is equal to the area of all 10 quadrats = 0.625m^{2}.
20 plantains across 10 quadrats  20 + 0.625m^{2} = 32 plantains per m^{2}.
32 x area of field (50m x 100m = 5000m^{2}) .
32 x 5000 = 160,000 Plantains on the field (estimate).
I could be absolutely dead wrong, so let me know.
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Updated: June 19, 2016
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