[drhaj]

and will i get the mark for saying 'same test tube must be used and the size of the pondweed must be same?' for the controlled variable question in question 1..

[drhaj]

(Original post by James3110)
Yes this was the question and I wrote because insulin would be produced which lowers the blood glucose level?

yep I wrote the same thing..

[Fas]

we doing same paper here? im certain for that graph of the blood glucose levels there was a 2 marker on why the dude with the higher line on the graph HAS Diabetes " A doctor suggests person (A or B cannot remember) has Diabetes. What evidence from the graph supports this? "

[jacqueline789]

YESSS i got 30. Atleast an A

[Theoneoranro]

Did good in this but I messed up B3

[osama2]

maybe 33 100UMS. nearly all past papers its been 34, but this was a tiny bit harder

[Sheel1]

(Original post by osama2)
SOMEBODY PLEASE HELP.
for 8a i put Hh and Hh. then i wrote that 75% have the disease. and 25% dont. now i was refering to MY genetic diagram and NOT to the cats. will i still get 4 marks? because in my genetic diagram i got HH, Hh, Hh,hh. so hh would be normal but the rest would have the disease. PLEASE ANYONE?

Thats 4 makrs i belive as long as you get the answer right

[CookieMonster1995]

(Original post by kkk999)
No I didn't do any writing as it wasn't required. I'm more worried about it being in pencil though?

I learnt my lesson about that last year in AQA GCSE Gegraphy as they asked to draw a diagram and I did it in pencil, so this year I did it in pencil and then went over it in pen! I don't think it will matter however as so many people must draw in pencil!

[maxtate]

(Original post by Fas)
your answer for 4b i think is wrong mate, i dont think shape of the membrane changes??

and for 4c its unlikely its right, but it could be

Yehh lol I think the same didnt know what to write =P

[maxtate]

(Original post by drhaj)
and will i get the mark for saying 'same test tube must be used and the size of the pondweed must be same?' for the controlled variable question in question 1..

Pondweed one yes, not sure bout test tube one, they usually don't have that in the markscheme, bt you never know

[RandomGuy 6]

I wrote these for question 1b do you think it will be worth 3 marks?
the size of the pondweed
the amount of water in the test tube
the light intesity

[maxtate]

(Original post by R.P.Everything.)
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.

Think you missed one about why the glucose levels decreased from the graph?? The answer was because Insulin was secreted so more was converted to glycogen?? I think lol

[k.lunstone]

(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 44 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
-Same concentration of CO2
-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)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.
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 6b the exam board mark scheme will say:

for mark 1
blood vessels supplying (skin)
capillaries
or
arteries
or
arterioles
do not accept capillaries / veins

for mark 2
dilate / widen
allow vasodilation
*do not accept idea of blood vessels moving

accept shunt vessels close for 2
marks

[RandomGuy 6]

(Original post by k.lunstone)
for question 6b the exam board mark scheme will say:

for mark 1
blood vessels supplying (skin)
capillaries
or
arteries
or
arterioles
do not accept capillaries / veins

for mark 2
dilate / widen
allow vasodilation
*do not accept idea of blood vessels moving

accept shunt vessels close for 2
marks

Is that question from a past paper?

[k.lunstone]

also for question 5b the mark scheme will say you need two avantages and two disadvantages to gain 3 marks and for the fourth mark a conclusion, it will also say for the conclusion
ignore advantages outweigh disadvantages unqualified.

[k.lunstone]

(Original post by RandomGuy 6)
Is that question from a past paper?

yes, one which had the exact same question

[Fas]

yeap, Conclusion needs to be YOUR judgment then backed up by a advantage and disadvantage. i basically said it was good to use super farming as the milk yield would be very high, however they should make sure they can afford it as £50 million was a lot of money and it shouldnt be wasted :P

[teengeek]

for Q6a, i put that it is more humid in the rainforest and therefore more difficult for the scientists sweat to evaporate

would i get marks for that? xx

[R.P.Everything.]

(Original post by maxtate)
Think you missed one about why the glucose levels decreased from the graph?? The answer was because Insulin was secreted so more was converted to glycogen?? I think lol

Yes that's the one - cheers.

I put that the glucose could have been consumed in respiration, although I think the answer they were looking for was probably yours.

[IM_Mvp]

Q2) (d) insulin stimulates the liver to convret glucose into glycogen