[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.

[AnyRandomName]

(Original post by R.P.Everything.)
An unofficial mark scheme. If I have missed out any questions or answers, please say so in the thread, as I only count 43 marks worth of questions here.

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
-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)How can you tell person B has diabetes (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
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.

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.
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.
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.

For question 1b couldn't you put that they should all have the same concentration of carbon dioxide available?

[gg12]

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

[R.P.Everything.]

(Original post by AnyRandomName)
For question 1b couldn't you put that they should all have the same concentration of carbon dioxide available?

Yes, true - I've now added that in.

Anyone any idea what question or questions I have missed out from the mark scheme? I only count 43 marks.

[gg12]

For question 7D, can you not say that they need it for photosynthesis which is then used for humans to breathe?

[R.P.Everything.]

(Original post by gg12)
For question 7D, can you not say that they need it for photosynthesis which is then used for humans to breathe?

I'm pretty sure the question was centred on the plant itself, and why it was important for the plant, so I would say the chances are probably slim for a mark there.

[LucyW456]

for 6a) i put that the scientists in the hot desert sweat more which evaporates of the skin cooling it- is that not right?

[osama2]

question 1b, "from the same plant". could this be correct

[leocantus]

For question 6a, the text above said something about people sweating when they get hot. So I said the scientist in the hot desert will sweat more because of the higher temperature and therefore his body temperature will become lower. Would that be right?

[R.P.Everything.]

(Original post by LucyW456)
for 6a) i put that the scientists in the hot desert sweat more which evaporates of the skin cooling it- is that not right?

Possibly, I've put it on the mark scheme as another answer.

(Original post by osama2)
question 1b, "from the same plant". could this be correct

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

[Ketchup!]

(Original post by osama2)
question 1b, "from the same plant". could this be correct

No because there were 3 different species of pondweed used.

EDIT: sorry OP, you posted just before me so didn't see your response first

[osama2]

u know the super farms ones. did u have to state an advantage and a disadvantage for both traditional farms and superfarms? or just farms?

[Ketchup!]

(Original post by osama2)
u know the super farms ones. did u have to state an advantage and a disadvantage for both traditional farms and superfarms? or just farms?

You have to do at least one advantage and disadvantage for each type of farm to have a chance at getting full marks

[Sheel1]

aw man 36/45 ;( hopefully the UMS marks how dowwn

[Princess008]

Hi
it wasnt why B has diabetes it was A
and you missed out a question i thinkk it was "suggest why B does not have diabetes something along that line

[Princess008]

looking at everyones mark i think the grade will be

A*-33-35
A-27-28
B -24
C-18

I Might be wrong.

[Princess008]

does spelling matter?
for dilate i spelt it dialect LOOOL?
should it be fine?

[Princess008]

q1 c) i wrote enviroment ? is that a mark?

[Princess008]

oh and you forgot that question where you had to find the difference
i did 99-89
but others got 99-89 will there be a range?

[MMiglio96]

For question 1 on the pondweed control can you put:
External conditions around the test tube such as light intensity and temperature