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ActaNonVerba
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#1061
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#1061
(Original post by Santorum)
For 1a) I put population change during the period and population number at the start of the period since the question asked for growth rate not just growth.

5c) I'm an idiot I put 61% by accident but I did the rest of it correctly would I get any marks haha?
using example of birth rate equation and death rate in the book wouldn't it be population change in a year/total population in the same year (not just at the start)
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ActaNonVerba
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#1062
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#1062
(Original post by posting)
Yeah thats what i though aswell...
you thought right
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JAJC
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#1063
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#1063
oh.my.god i missed the 4 marker on the back. it gets worse.
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posting
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#1064
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#1064
(Original post by ActaNonVerba)
you thought right
wohoo thought i lost 4 marks :/
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Tikara
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#1065
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#1065
What was 8c again?
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billybobs
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#1066
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#1066
(Original post by Tikara)
What was 8c again?
Something to do with how intensive farming increases productivity of domestic livestock.
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posting
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#1067
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#1067
(Original post by Tikara)
What was 8c again?
How intensive rearing on livestock, increases net productivity? (4)
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laser174572
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#1068
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#1068
(Original post by ActaNonVerba)
6 asked why is there high diversity in birds in amazon rain forest no? - I explained most of what you said but didn't the main thing want you to mention more habitats/niches, more food sources etc?
(Original post by posting)
Yeah thats what i though aswell...
(Original post by ActaNonVerba)
you thought right
Yeah sorry guys I missed those points out, you're quite right, I've now included them, thanks

1 a) What information is needed to calculate the growth rate of a population? (2)
- Birth and death rates
- Immigration and emmigration rate
OR
- Initial population
- Rate of population change
b) How does the graph show that it is in the early stages of a demographic transition? (2)
- Low life expectancy
- High death and birth rates

2 a) Which species is the pioneer? (1)
- U. Lactulana (something like that anyway)
b) 2b Explain how succession happens using examples.
- Colonization of Whatever
- Makes environment change
- Allows other whatever species to colonize
- Which change the environment to make it less hostile and more stable
- Which allows other species which are more adapted to colonize
- Climax

5 c) (?) The rate of the condition in a population was 1 in 1000. What would you expect the percentage of heterozygous individuals to be?
q^2 = 0.001, q = 0.0316, p= 0.9683, 2pq= 0.0612 = 6.12%


6 a) Explain how fragmentation of the Amazon rainforest in the past led to high species diversity in the current day (5)
- Initially there is variety
- Due to mutation
- Geographic isolation as forest fragments.
- Different selection pressures
- Different alleles selected for, differential reproductive success
- Frequency of different alleles increases in the different populations.
- When the areas become linked once again the species are genetically isolated and can no longer breed - they are different species
- More plant species
- More habitats/niches/food sources
- Therefore more species of bird

b) Why does speciation not occur as often now?
- As members of a population are not isolated they can read freely
- Same selection pressures affect whole population (wasn't as sure about this one, if anyone has any ideas please edit and re-post)


8 a) Describe the advantages of IPM (6)
- Minimises use of pesticides so minimises resistance
- Mechanical removal of pests minimises impact on non-pest species
- Biological aspect only requires one application and is specific
-Improved biodiversity
- Pesticides work instantly
- Biological agents slow
- Biological agents don't kill all of the pests
- Pesticides do
- Biological agents don't need to be continually applied
- Pesticides do
- Biological agents don't build up resistance
- Pesticides do


Anyone know any more points for this? I struggled a bit with this one


b) Describe how nitrates lead to the death of fish in ponds and lakes (5)
- High nitrate concentration causes and algal bloom
- Blocks light
- Plants at the bottom of the pond/lake can no longer photosynthesise and die.
- Saprobiontic organisms decompose the dead plants
- These respire aerobically
- Oxygen concentration of the water falls
- Fish require high oxygen concentration and so die

c) Describe how intensive farming methods increase the productivity of livestock (4)
- Selectively bred for maximum productivity
- Kept in a warm environment to minimise amount of energy required to maintain body temperature and minimise respiratory losses
- Movement may be restricted to minimise respiratory losses, maximising energy available for growth
-Fed concentrate diets which are easily digested so minimum energy is lost in the faeces


I can remember a couple of the other questions :
What is meant by phenotype? (2)
- Observable characteristics of an organism
- Resulting from both genotype and the effects of the environment

What evidence from the pedigree chart shows that the condition is recessive?
- Unaffected parents produce affected offspring
- Parents are therefore heterozygous

What evidence from the pedigree chart shows that the condition is not X-linked?
- Affected daughter from unaffected father
- Daughter would have to have two copies of the recessive allele, one from each parent, therefore the father would have the recessive allele and as males only have one X chromosome would be affected.

I can't remember what question numbers these were though, anyone?
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KatyGal
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#1069
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#1069
What was the reason for concrete use as a surface being unreliable?


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ActaNonVerba
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#1070
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#1070
was the second father affected?
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Silmirel
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#1071
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#1071
(Original post by KatyGal)
What was the reason for concrete use as a surface being unreliable?


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It is not naturally occuring on the rocky shore so results may be different...
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Smartass
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#1072
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#1072
(Original post by KatyGal)
What was the reason for concrete use as a surface being unreliable?


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Ermm i put becaus it wasnt part of the natural environment could damage plants and nlock light of photosynthesus


Posted from TSR Mobile
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billybobs
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#1073
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#1073
(Original post by KatyGal)
What was the reason for concrete use as a surface being unreliable?
Something to do with how concrete doesnt naturally occur (it is man-made) so may contain substances that naturally occuring rocks do not that may affect the growth of the species of plant. ORA.
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<3xo
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#1074
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#1074
I failed on all the photosynthesis questions! Can anyone remember the exacts questions/answers to them?
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Chicken Bacon
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#1075
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#1075
(Original post by posting)
wohoo thought i lost 4 marks :/
you thought right
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flyylikejetz
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#1076
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#1076
(Original post by laser174572)
What evidence from the pedigree chart shows that the condition is not X-linked?
- Affected daughter from unaffected father
- Daughter would have to have two copies of the recessive allele, one from each parent, therefore the father would have the recessive allele and as males only have one X chromosome would be affected.
I put there was an affected mother but her son was un-effected this shows its not on X chromosome as mother would be homozygous recessive and males get their X chromosome from their mothers .... you think that would suffice as well ?
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khalidpatel
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#1077
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#1077
(Original post by laser174572)
Yeah sorry guys I missed those points out, you're quite right, I've now included them, thanks

1 a) What information is needed to calculate the growth rate of a population? (2)
- Birth and death rates
- Immigration and emmigration rate
OR
- Initial population
- Rate of population change
b) How does the graph show that it is in the early stages of a demographic transition? (2)
- Low life expectancy
- High death and birth rates

2 a) Which species is the pioneer? (1)
- U. Lactulana (something like that anyway)
b) 2b Explain how succession happens using examples.
- Colonization of Whatever
- Makes environment change
- Allows other whatever species to colonize
- Which change the environment to make it less hostile and more stable
- Which allows other species which are more adapted to colonize
- Climax

5 c) (?) The rate of the condition in a population was 1 in 1000. What would you expect the percentage of heterozygous individuals to be?
q^2 = 0.001, q = 0.0316, p= 0.9683, 2pq= 0.0612 = 6.12%


6 a) Explain how fragmentation of the Amazon rainforest in the past led to high species diversity in the current day (5)
- Initially there is variety
- Due to mutation
- Geographic isolation as forest fragments.
- Different selection pressures
- Different alleles selected for, differential reproductive success
- Frequency of different alleles increases in the different populations.
- When the areas become linked once again the species are genetically isolated and can no longer breed - they are different species
- More plant species
- More habitats/niches/food sources
- Therefore more species of bird

b) Why does speciation not occur as often now?
- As members of a population are not isolated they can read freely
- Same selection pressures affect whole population (wasn't as sure about this one, if anyone has any ideas please edit and re-post)


8 a) Describe the advantages of IPM (6)
- Minimises use of pesticides so minimises resistance
- Mechanical removal of pests minimises impact on non-pest species
- Biological aspect only requires one application and is specific
-Improved biodiversity
- Pesticides work instantly
- Biological agents slow
- Biological agents don't kill all of the pests
- Pesticides do
- Biological agents don't need to be continually applied
- Pesticides do
- Biological agents don't build up resistance
- Pesticides do


Anyone know any more points for this? I struggled a bit with this one


b) Describe how nitrates lead to the death of fish in ponds and lakes (5)
- High nitrate concentration causes and algal bloom
- Blocks light
- Plants at the bottom of the pond/lake can no longer photosynthesise and die.
- Saprobiontic organisms decompose the dead plants
- These respire aerobically
- Oxygen concentration of the water falls
- Fish require high oxygen concentration and so die

c) Describe how intensive farming methods increase the productivity of livestock (4)
- Selectively bred for maximum productivity
- Kept in a warm environment to minimise amount of energy required to maintain body temperature and minimise respiratory losses
- Movement may be restricted to minimise respiratory losses, maximising energy available for growth
-Fed concentrate diets which are easily digested so minimum energy is lost in the faeces


I can remember a couple of the other questions :
What is meant by phenotype? (2)
- Observable characteristics of an organism
- Resulting from both genotype and the effects of the environment

What evidence from the pedigree chart shows that the condition is recessive?
- Unaffected parents produce affected offspring
- Parents are therefore heterozygous

What evidence from the pedigree chart shows that the condition is not X-linked?
- Affected daughter from unaffected father
- Daughter would have to have two copies of the recessive allele, one from each parent, therefore the father would have the recessive allele and as males only have one X chromosome would be affected.

I can't remember what question numbers these were though, anyone?
Does anybody remember what question 3 , 4 , first bit of question 5 and question 7 are??
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ActaNonVerba
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#1078
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#1078
(Original post by iAre Teh Lejend)
you thought right
Loooooool that's harsh, less of that please
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billybobs
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#1079
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#1079
(Original post by khalidpatel)
Does anybody remember what question 3 , 4 , first bit of question 5 and question 7 are??
Question 3: Photosynthesis and Iron deficiency,

Question 4: Respiration and inhibition of the enzyme that converts succinate to fumarate.
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<3xo
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#1080
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#1080
also what was the answer to the question that was something about how it doesnt show malaria causing more infection or something?
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