Qualification > Sciences
IGCSE Biology Paper 3
mr_scholes:
--- Quote from: IG_ICE09 on June 09, 2009, 06:44:53 am ---if u remember the last question, first subquestion which had sumthin "Suggest three reasons why not all the energy in the wheat crop is available in animal feed" or sumthin like that i wrote:
1) not all the sunlight available to the wheat crop is used by it
2) animal may not eat all of the wheat crop , some of it is undigested
3) wheat crop may use some of its energy for respiration i.e. for growth or active transport
does that make sense?
--- End quote ---
u had to write about
energy loss e.g. energy lost by movement-respiration-heat loss in urine+faeces-not all organism is digested/eaten etc..
QuickSilver:
--- Quote from: IG_ICE09 on June 09, 2009, 06:44:53 am ---if u remember the last question, first subquestion which had sumthin "Suggest three reasons why not all the energy in the wheat crop is available in animal feed" or sumthin like that i wrote:
1) not all the sunlight available to the wheat crop is used by it
2) animal may not eat all of the wheat crop , some of it is undigested
3) wheat crop may use some of its energy for respiration i.e. for growth or active transport
does that make sense?
overall i thot the questions had too many marks! all 3,4, 5 mark questions..loads of questions were overmarkd n were given like 4 or 5 marks..nyway for the table in the first question, i ticked "Scales/scaly skin" for birds, as all textbooks say birds have scales on their feet, but many ppl in my class sed u didnt hav 2 tick it!
--- End quote ---
Hey
I cant jude really if what you wrote is correct or not, but it seems ok
This is what I wrote:
1-Some energy is used by the wheat for itself and the process carried out in the plant itself
2-Some Tiny unwanted animals or insects such as rats or cockoraches may be feeding on the wheat too thus
reducing the total energy available for the animals
3-Some energy is wasted when it is flowing through the food chain i.e from the plant to the animals in the form of heat
And YEAh ur right tooo many marks for even small quesations
and for the birds YOU HAVE TO TICK THE SCALES IT IS CORRECT SCALES FOR BIRDS ARE CORRECT
Hope I Helped :)
abcdef:
For dry mass question, I wrote, take the plants from solution and measure it. (that's what I remember)
I missed the natural selection and glucose concentration.
What did you write for "trophic level question" ?
QuickSilver:
can someone check if my reasons are correct?
Thanks,
thukon:
SCALES FOR BIRDS IS WRONG.
They want to know which organisms are covered in whatever. So scales/scaly skin is only reptiles and fish.
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