[latifcool1]

does spelling matter in this test?

[latifcool1]

does spelling matter in this test that much?

[Fas]

well yes spelling will matter to an extent

[Graham981]

Here's the mark scheme and question paper for anyone who needs it.

[Graham981]

The exam board penalise candidates often over minor things such as using "it", misspellings, and even not for being succinct enough.

In my last exam according the the unofficial mark scheme on this website, I got 38/45 but turned on results day that I got 33/45.

So take the unofficial mark scheme and grade boundary forecasts as a prediction.

Also the overall UMS like 360 UMS is for an A*, is not set in stone, if too many people get 360+, AQA may raise the boundary for an A* to like 370.

[daksesh]

(Original post by R.P.Everything.)
An unofficial mark scheme. If I have missed out any answers, please say so in the thread below.

Q1a) What process produces oxygen (1)
-Photosynthesis.

Q1b) Name three variables that had to be controlled in the Pondweed experiment (3).
-Mass of Pondweed used.
-Intensity/distance of light.
-Temperature of the Water
-Same concentration of CO2
-pH of water used.
-Size of test tube?
-Volume of water used?

Q1c) What other factor might a pond owner also need to take into account before buying pondweed (all pondweed costs the same) (1)?
- Survivability/resistance to cold
- Whether or not the pondweed is poisonous to fish.

Q1d) The mineral ion that stops yellow leaves (1).
- Magnesium

Q2a)What hormone controls blood glucose levels (1)?
-Insulin
Q2b)Where is this hormone secreted from (1)?
-Pancreas
Q2c)Work out the change in person A's blood glucose levels after drinking the glucose solution.
-11 (99-88 = 11).
Q2d)Why might the glucose level have dropped? (1)
-Insulin converts glucose into glycogen.
-Glucose used up in respiration to release energy.
Q2e)How can you tell person B has diabetes. Use evidence from the graph (2)?
-High blood glucose levels to begin with.
-Takes three hours for blood sugar to return to normal.
-Blood glucose rose more sharply than person A.

Q3a)What might make people think Euglena is a plant (2)?
-Has a vacuole
-Has chloroplasts.
Q3b)What might make people think Euglena is an animal (1)?
-No cell wall
-Flagella
Q3c) When put in salt water, the Euglena shrinks. Why? (3)
-Salt solution more concentrated than cytoplasm.
-Water moves out from Euglana into the solution...
-Through a semi permeable membrane...
-In a process called osmosis.

Q4a) Name two other enzymes secreted by the pancreas (2):
- Protease
- Amylase/Carbohydrase (can have one or the other, but not both).
Q4b) How do the enzymes in the pill get released in the small intestine (2):
- No lipase in the stomach or mouth - only amylase and protease, so the lipid coating doesn't dissolve.
- Once in the small intestine, the duodenum secretes lipase, which digests the coating, releasing the enzymes into the small intestine.
Q4c) Why didn't the lipase in the shell digest the coating? (1)
-It was in the form of dry beads.

Q5a) Evaluate Superfarms (4) (any three points below for 1 mark each)
Pros:
-Provide electricity for 2000 homes.
-Produces more milk per cow.
-Cheaper milk for customers.
-Less space for cows to move around in, so more biomass used to create milk.

Cons:
-Animals are likely to spread disease.
-Animals only have 6 square meters of land to live on - poor conditions.

Argued conclusion for the last mark.

Q5b) Explain how the carbon compounds in the waste can be used to aid the grass in the fields (3).
-Decomposers eat the waste.
-Use it in respiration, releasing CO2.
-CO2 absorbed by plants in the field via photosynthesis.

Q6a) Explain the core body temperatures of the scientists (2).
-Scientist in the desert loses more heat, due to the higher wind speed and lower humidity.
-The air in the desert is hotter, so the scientists sweat more, thereby cooling them down?
Q6b) Explain how blood vessels respond to an increase in core body temperature. (2)
-Arterioles supplying the capillaries dilate.
-More blood in contact with the air, losing energy to the environment.

Q7a) What time does the rate of respiration equal the rate of photosynthesis? (1)
- 7:30am and 7:30pm.
Q7b) How many arbitrary units of CO2 given out in respiration per hour? (1)
- 11
Q7c) How many arbitrary units of CO2 taken in by photosynthesis at 3:00pm? (1)
- 22+11 = 33 units.
Q7d) Why is it important that a plant takes in more CO2 than it gives out? (2)
- takes in CO2 in photosynthesis to create glucose.
- gives out CO2 during respiration.
- Must create more glucose than it consumes in respiration, therefore, must take in more CO2 than it gives out.

Q8a) What alleles do the parents have? (4)
-Parent A is Hh, Parent B is Hh too.
-Marks for correct answers, drawing of a punnet square, and possibly for annotations as well.
Q8b) What combination of alleles might cat D have? (1)
-Cat D is either HH or Hh.
Q8c) Why can't you tell which combination it has? (1)
-The polydactyly gene is dominant, so it would be expressed in both cases.

ESTIMATED GRADE BOUNDARIES

A* - 28
A - 25
B - 20
C - 15
D- 12

June 2011 grade boundaries were the same, but 2 lower in every grade. I've estimated conservatively, and don't expect the grade boundaries to exceed this.

For question 5b, I said that because they can get diseases easily, they will be given antibiotics. This means that the milk from the cows will have antibiotic in it, this means that we will become immune to the antibiotic and so it will have no effect when we use antibiotics.

Would this be right?

[Lou23.]

(Original post by R.P.Everything.)
Possibly, I've put it on the mark scheme as another answer.



I don't think so, because the three different pond weeds were different species.

For Q6a) I wrote about vascoconstriction, is that correct?

[R.P.Everything.]

(Original post by Lou23.)
For Q6a) I wrote about vascoconstriction, is that correct?

For 6a, I'm not sure. There may be credit for it, but I imagine the marks will mainly be credited for reference to the wind speed and the humidity.

[Lou23.]

(Original post by R.P.Everything.)
For 6a, I'm not sure. There may be credit for it, but I imagine the marks will mainly be credited for reference to the wind speed and the humidity.

whoops sorry, I meant 6b?
I did refer to the wind speed and the humidity

[h1234567]

are you sure 28/45 is an A*... the grade boundaries seem a bit low?

[Fas]

(Original post by Graham981)
The exam board penalise candidates often over minor things such as using "it", misspellings, and even not for being succinct enough.

In my last exam according the the unofficial mark scheme on this website, I got 38/45 but turned on results day that I got 33/45.

So take the unofficial mark scheme and grade boundary forecasts as a prediction.

Also the overall UMS like 360 UMS is for an A*, is not set in stone, if too many people get 360+, AQA may raise the boundary for an A* to like 370.

NO this is not true, it is raw marks which decide the UMS grade boundaries, the UMS grade boundaries is ALWAYS 360/400 however it is the raw mark which decides the 90/100 UMS A* boundary. it is always top 10% of people who are awarded an A* , so if your mark of 33/45 landed in top 10% of the country then you would be awarded an A* and above 90 ums.


This way AQA can control the number of A* without having to change the UMS scale

[Fas]

(Original post by Lou23.)
whoops sorry, I meant 6b?
I did refer to the wind speed and the humidity

no vasoconstriction is wrong i think , because when theres an increase in body temperature , the body needs to cool down by losing more heat. Vasoconstriction means the arterioles will constrict not allowing heat to the surface of the skin , so less heat is lossed which means the temp will go up. this is not what will happen in hot core body temperature.

Vasodilation is correct, vasoconstriction is wrong

[Fas]

(Original post by h1234567)
are you sure 28/45 is an A*... the grade boundaries seem a bit low?

it was 26/45 last year, i personally think A* will be around 30/45 maybe 32 but who know

[Lou23.]

(Original post by Fas)
no vasoconstriction is wrong i think , because when theres an increase in body temperature , the body needs to cool down by losing more heat. Vasoconstriction means the arterioles will constrict not allowing heat to the surface of the skin , so less heat is lossed which means the temp will go up. this is not what will happen in hot core body temperature.

Vasodilation is correct, vasoconstriction is wrong

Awh maaan I'm so bad at Biology! and just science in general

[pseudonymegg]

(Original post by latifcool1)
does spelling matter in this test that much?

They usually allow phonetic spellings

[dtin]

(Original post by gg12)
According to this, I got 29/45. I'm hoping that's an A, but I'll be perfectly happy with a B!

i reckon if you get 29 then it would give you a high A if not an A* marking my repsonses fairly then i got 27 or 28 im hoping for grade boundaries as low as last summer though

[MichelleQ]

(Original post by R.P.Everything.)
An unofficial mark scheme. If I have missed out any answers, please say so in the thread below.

Q1a) What process produces oxygen (1)
-Photosynthesis.

Q1b) Name three variables that had to be controlled in the Pondweed experiment (3).
-Mass of Pondweed used.
-Intensity/distance of light.
-Temperature of the Water
-Same concentration of CO2
-pH of water used.
-Size of test tube?
-Volume of water used?

Q1c) What other factor might a pond owner also need to take into account before buying pondweed (all pondweed costs the same) (1)?
- Survivability/resistance to cold
- Whether or not the pondweed is poisonous to fish.

Q1d) The mineral ion that stops yellow leaves (1).
- Magnesium

Q2a)What hormone controls blood glucose levels (1)?
-Insulin
Q2b)Where is this hormone secreted from (1)?
-Pancreas
Q2c)Work out the change in person A's blood glucose levels after drinking the glucose solution.
-11 (99-88 = 11).
Q2d)Why might the glucose level have dropped? (1)
-Insulin converts glucose into glycogen.
-Glucose used up in respiration to release energy.
Q2e)How can you tell person B has diabetes. Use evidence from the graph (2)?
-High blood glucose levels to begin with.
-Takes three hours for blood sugar to return to normal.
-Blood glucose rose more sharply than person A.

Q3a)What might make people think Euglena is a plant (2)?
-Has a vacuole
-Has chloroplasts.
Q3b)What might make people think Euglena is an animal (1)?
-No cell wall
-Flagella
Q3c) When put in salt water, the Euglena shrinks. Why? (3)
-Salt solution more concentrated than cytoplasm.
-Water moves out from Euglana into the solution...
-Through a semi permeable membrane...
-In a process called osmosis.

Q4a) Name two other enzymes secreted by the pancreas (2):
- Protease
- Amylase/Carbohydrase (can have one or the other, but not both).
Q4b) How do the enzymes in the pill get released in the small intestine (2):
- No lipase in the stomach or mouth - only amylase and protease, so the lipid coating doesn't dissolve.
- Once in the small intestine, the duodenum secretes lipase, which digests the coating, releasing the enzymes into the small intestine.
Q4c) Why didn't the lipase in the shell digest the coating? (1)
-It was in the form of dry beads.

Q5a) Evaluate Superfarms (4) (any three points below for 1 mark each)
Pros:
-Provide electricity for 2000 homes.
-Produces more milk per cow.
-Cheaper milk for customers.
-Less space for cows to move around in, so more biomass used to create milk.

Cons:
-Animals are likely to spread disease.
-Animals only have 6 square meters of land to live on - poor conditions.

Argued conclusion for the last mark.

Q5b) Explain how the carbon compounds in the waste can be used to aid the grass in the fields (3).
-Decomposers eat the waste.
-Use it in respiration, releasing CO2.
-CO2 absorbed by plants in the field via photosynthesis.

Q6a) Explain the core body temperatures of the scientists (2).
-Scientist in the desert loses more heat, due to the higher wind speed and lower humidity.
-The air in the desert is hotter, so the scientists sweat more, thereby cooling them down?
Q6b) Explain how blood vessels respond to an increase in core body temperature. (2)
-Arterioles supplying the capillaries dilate.
-More blood in contact with the air, losing energy to the environment.

Q7a) What time does the rate of respiration equal the rate of photosynthesis? (1)
- 7:30am and 7:30pm.
Q7b) How many arbitrary units of CO2 given out in respiration per hour? (1)
- 11
Q7c) How many arbitrary units of CO2 taken in by photosynthesis at 3:00pm? (1)
- 22+11 = 33 units.
Q7d) Why is it important that a plant takes in more CO2 than it gives out? (2)
- takes in CO2 in photosynthesis to create glucose.
- gives out CO2 during respiration.
- Must create more glucose than it consumes in respiration, therefore, must take in more CO2 than it gives out.

Q8a) What alleles do the parents have? (4)
-Parent A is Hh, Parent B is Hh too.
-Marks for correct answers, drawing of a punnet square, and possibly for annotations as well.
Q8b) What combination of alleles might cat D have? (1)
-Cat D is either HH or Hh.
Q8c) Why can't you tell which combination it has? (1)
-The polydactyly gene is dominant, so it would be expressed in both cases.

ESTIMATED GRADE BOUNDARIES

A* - 28
A - 25
B - 20
C - 15
D- 12

June 2011 grade boundaries were the same, but 2 lower in every grade. I've estimated conservatively, and don't expect the grade boundaries to exceed this.

For the genetic diagram one i put Hh and hh would they accept that? and i put 50% chance probability because it has something to do with huntingtons? not so sure though.

[pseudonymegg]

(Original post by MichelleQ)
For the genetic diagram one i put Hh and hh would they accept that? and i put 50% chance probability because it has something to do with huntingtons? not so sure though.

may get some marks but not full as the offspring of cats meant it had to be Hh Hh parents also it wasnt linked to Huntingtons

[MichelleQ]

Thanks What do you think you got?

[diggy]

Lol I've forgotten everything I've learnt already

This was posted from The Student Room's Android App on my GT-I9100