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AQA BIOL4 ~ 11th June 2013 ~ A2 Biology

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So what do people think the grade boundaries will be for this paper? I thought it went well, it was a relatively easy paper.

Reply 1101

wrnicholls

Original post by jonnyb123

So what do people think the grade boundaries will be for this paper? I thought it went well, it was a relatively easy paper.

What paper were you doing ?

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Reply 1102

Starlight94

I did 2 x 0.03 x 0.97 and got 5.82 or something :/

Reply 1103

Monster94

Original post by daniel fishburn

They kept the plants in the dark so the light dependant reactions couldn't occur, meaning no reduced NADP is produced so the Kalvin cycle couldn't happen, setting the value for TP in both plants to 0 alowing the change to be fairly and easily measured.

I said this too and I said it was a standard (reference) too what do you think of that? :s-smilie:

Reply 1104

ActaNonVerba

Well, off to the biol5 and F335 thread I go.. Hope you all aced it and get the grades you need :smile:

Reply 1105

posting

Original post by TH4RG3

YES someone that agrees with me!! Has nothing to do with birth/death rate!

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It does have to do with birth/death rates.I put birth/death rate immi/emigration rate and original population...
you need birth/death rate to calculate growth....

Reply 1106

Chicken Bacon

Original post by ActaNonVerba

Loooooool that's harsh, less of that please

LOOOL. Just stating the truth. xD

Reply 1107

Smartass

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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Did you put disadvantages aswell because thats wot i did :/

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Reply 1108

Ravs101

Original post by Son234

Not entirely sure about your second fact

But those grade boundaries seem reasonable

I can see

A*-65
A-61
B-57 :frown:

Sorry yh you are right i was talking absolute hogwash, 100 ums for an exam, can't remember which year was 61/75 :smile:

...

This was posted from The Student Room's iPhone/iPad App

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Reply 1109

TheFootyKing19

Original post by amychan

for the question about concrete block, I rmb it was asking about the validity or something like that. So I put the mineral ions content in different concrete blocks vary and this will affect the growth of algae.

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No idea! What do you think of the other answers? :wink:

Reply 1110

jonnyb123

Original post by wrnicholls

What paper were you doing ?

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huh? erm, this one?

Reply 1111

Chicken Bacon

Original post by Ravs101

Possible grade boundaries:
A- 61
B-56
C-51
D-47
E-43

What do you think?
Just letting you know, an A has been above 60 once I do believe that an A will be above 60 in this case as well if I'm honest....

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An A has never been above 60 lol.

Reply 1112

ActaNonVerba

does anyone remember if the second father was affected? or just a carrier

Reply 1113

Ravs101

Original post by ActaNonVerba

does anyone remember if the second father was affected? or just a carrier

I'm pretty sure the 2nd father was just a carrier :smile:

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Reply 1114

elja1905

Original post by Starlight94

I did 2 x 0.03 x 0.97 and got 5.82 or something :/

Omg i got that too cause i rounded the answers! Im glad someone else got that

Reply 1115

TheFootyKing19

Answers from top of my head:

Pioneer species: - Ulva Lactuna (whatever it was)

Blocks: - blocks may prevent growth of algae? (Not sure)

Describe and explain succession:
- pioneers species change environment
- allows other species to colonise
- other species outcompete existing ones
- environment less hostile
- then just talk about what's happening in graph between different types of algae

Define phenotype: (this is what's in the spec)
- expression of the genetic constitution
- and it's interaction with the environment

Tach-says caused by recessive allele: (can't remember what the actual numbers were on pedigree diagram)
- offspring has condition
- parents don't so must be carriers/heterozygous

Hardy Weinberg calc:
- 6%
- but I'm sure you can get 1/2 marks for identifying q^2 and working out 2pq?

Why the number of heterozygotes may be different?
- random fusion of gametes

Tick box for respiration: (Y represents Yes)
- occurs in mitochondria X Y Y
- co2 produced X Y Y
- reduced NAD Y Y Y

Why glucose not used as respiratory substrate:
- glucose broken down into pyruvate
- glycolysis only occurs in the cytoplasm

How does methanfate (whatever it was) inhibit reaction:
- competitive inhibition/ binds to active site of enzyme
- preventing an enzyme substrate complex to form

Why oxygen concentration decrease:
- oxygen is a terminal electron acceptor
- oxygen combines with protons and electrons to form a molecule of water

In dark:
- so no photosynthesis can take place

I ron deficiency - TP:
- less GP produced
- less TP produced
- less electrons excited in chlorophyll
- less ATP produced
Etc (??? No idea??)^

Take lizards from many sites, why:
- so that investigation is 'representative of the whole sample'

Random:
- uses a random number generator (calculator)
- produce numbers to use as co-ordinates on a grid

% used:
- allow a comparison to be made
- as into atlas starting numbers were different

- questions on interpreting etc...

Speciation: (in a nut shell)
- populations become isolated
- 2 populations separate thus no interbreeding between them
- variation
- such as mutations exist
- advantageous allele
- successfully reproduce
- leads to a change in allele frequency

Increase in nitrates in river: (in a nut shell)
- eutrophication occurs
- algal bloom occurs
- dense later of algae, absorb light
- increased competition of algae, death too
- decomposed by saprobionts whose populations increase
- increased aerobic respiration by the above ^ uses up oxygen
- water becomes depleted, hence fish die

Integrated Pest Management: (this question did not ask advantages of bio control and pesticides):
- reduces amount of pesticides that need to be sprayed
- minimizes risk to both humans and environment
- reduces risk of pests developing resistance
- increase crop productivity
- limits economic damage to agricultural system
- cheap to use - requires one application

Intensive rearing of domestic live feedstock to increase net productivity:
- kept inside so loss energy lost as heat
- controlled diet and fed on high proportion of carbohydrates so less is in farces
- restricted movement so less energy wasted in movement
- genetically selected for high productivity
- antibiotics added to reduce any risk of disease

Reply 1116

n15

Original post by Starlight94

I did 2 x 0.03 x 0.97 and got 5.82 or something :/

I did this too and then in the last 30 secs recalculated got the 6. something answer and just wrote it down so basically in my answer box theres like 2 answers ffs :frown: