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Edexcel iGCSE Biology 2017 May
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How did you all find it? We all found very hard especially how we all revised loads and usually hit A*s?
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#5
(Original post by xx_sarah_xxoo)
So hard, What answers did u guys put it?
So hard, What answers did u guys put it?
For the thing about the cardboard, I said that it mimics the conditions roots would experience in the ground as light is blocked
For all the questions about the leaves in light and dark areas, i just said that the dark leaves would get more light due to the adaptations and explained it more
Photosynthesis in morning factors
- Temp and light intensity low as sun is not at highest point in sky etc. Slower rate of photosynthesis
Photosynthesis in afternoon factors
- Temp and light intensity higher as sun is at highest point and intense. Faster rate of photosynthesis basically and did more explanation
Carbon dioxide levels remain constant for both
The question about fungi decomposing wood:
- i spoke about saprotrophic nutrition and stuff like that
I mucked up by bar graph a bit because the scale was awkward and I didn't know we needed to know structure of neurone so I didn't revise it, which meant I didn't know direction of nerve impulses. However, I remembered the labels and knew how it was involved in relflex arc
Differences between chemical and electrical coordination:
- Sending messages via electrical impulses is faster than sending messages through chemicals (hormones)
- Hormones are carried through blood and electrical impulses through nerves
- Then i just stated that electrical coordination happens through electrical impulses and chemical coordination occurs through hormones being released
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#9
For the visking tube question, what did you guys write for "what biotic variables should be controlled". I don't know if that was the exact question, but it was something like that.
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(Original post by Chelsea69)
For the lipids question I said the greasy spot test making a translucent mark
For the lipids question I said the greasy spot test making a translucent mark
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(Original post by Iloves)
For the visking tube question, what did you guys write for "what biotic variables should be controlled". I don't know if that was the exact question, but it was something like that.
For the visking tube question, what did you guys write for "what biotic variables should be controlled". I don't know if that was the exact question, but it was something like that.
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#14
(Original post by Olliepotts777)
I just put the lipid test. On the spec we didn't have to know that. Just a stupid exam.
I just put the lipid test. On the spec we didn't have to know that. Just a stupid exam.
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#15
Question One was Trachea, Bronchus and Bronchioles
6CO2 + 6H2O = 6O2 + C6H12O6 Photosythesis Equation
Leaves in the light are thicker as they have a thicker cuticle and longer palisade cells, and sometimes several layers of palisade cells.
The Neurone was a Motor Neurone and Structure A was a Nucleus and Structure B was an Axon
Fungi are Saprotrophic. Fungi break down the cellulose to glucose using their enzymes which can penetrate the wood by their hyphae.The wood starts to rot inside with a brown or white colour
6CO2 + 6H2O = 6O2 + C6H12O6 Photosythesis Equation
Leaves in the light are thicker as they have a thicker cuticle and longer palisade cells, and sometimes several layers of palisade cells.
The Neurone was a Motor Neurone and Structure A was a Nucleus and Structure B was an Axon
Fungi are Saprotrophic. Fungi break down the cellulose to glucose using their enzymes which can penetrate the wood by their hyphae.The wood starts to rot inside with a brown or white colour
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#17
I did measure increase in volume within the measuring cylinder after 3 minutes- see what was greater then measurement increase with the bile, and the measurement without. Lipids cannot pass through the tube whereas fatty acid and glycerol can therefore you measure the rate and see if it is faster rate with the bile
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#18
For the Pedigree Chart, I put 10 with X and Y chromosome and 4 which are homozygous for the recessive allele.
For the Quadrat Question, I put 8 of those plants which was 0.22. I then put 4 Squares the other plant covered which was 11%
For the Quadrat Question, I put 8 of those plants which was 0.22. I then put 4 Squares the other plant covered which was 11%
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#19
And for the neurons it was a motor neurone Therefore transfer an electrical impulse to an effector muscle causing a reactions such as contraction of muscles
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#20
For the Quadrat Method, I did random sampling strategy with lots of Quadrats.Count the number of plants in a small area of the field and take an average and finally multiply the average by the total area of the large field
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