Qualification > Sciences
Biology Paper 1 and 3 help HERE ONLY!!!
Aodian:
--- Quote from: 247sports on June 07, 2009, 01:49:51 pm ---guyz do u think in m/j 2009 dats tmrw will they ask us to choose two questions and answer em because i criously dunt like em =s
--- End quote ---
that shte old syllabus they took that off since 2004 u dont need to worry about tat.. dont even bother answering that.. sum of it is AS level stuff
Aodian:
--- Quote from: monnie on June 07, 2009, 01:47:36 pm ---Hi how is biology with all of you
i have alot of questions considering i hate this subject so here they are please answer quickly
1. what the hell is conditioned reflexes?
2. what is the function of the midbrain?
3. can u tell me examples of continous and discontinous variations other than height and blood group?
4. what is the water cycle?i don't have it
5. what are the effects of deforestation?
6. what is biological control?
7. what is the function of companion cells?
8. what is negative and positive feedbacks, with examples please?and what is the difference between them?
i know they are alot but i realllllllllllllllllllllllllllllllly hate this subject and i don't get anything and the exam is tomorow
so many thanks for any contribution
--- End quote ---
http://www.s-cool.co.uk/gcse/biology/genes-and-genetics/variation.html another site for variation.. enjoy..
6.. effects of deforestation.. If u learn geo you'll know that deforestatin causese soil erosion.. the erosion of soil causes more of the earth to be washed away into the rivers causing a build up of mud.. can lead to landslides, flash floods, mud floods.. also it could cause a huge amount of pollution..
8.. i';ve never heard of positive feedback before.. but Negative feedback is what controls the AMOUNT of hormone secreted and WHEN they are secreted.. so controls the TIME of secretions and AMOUNT of seretion.. thats all of ur question i can answer.. take care n GUd luck for exams!
Feva:
If theres more than enough food for everyone in the world, why do so many die by starvation?
^ question in my text book and isnt answered..pfft someone answer :P
Aodian:
--- Quote from: Feva on June 07, 2009, 02:02:55 pm ---If theres more than enough food for everyone in the world, why do so many die by starvation?
^ question in my text book and isnt answered..pfft someone answer :P
--- End quote ---
its because the food cant get to those places.. even though there's soo much food. getting them to places where they need it most is stioll a problem..
247sports:
--- Quote from: monnie on June 07, 2009, 01:47:36 pm ---Hi how is biology with all of you
i have alot of questions considering i hate this subject so here they are please answer quickly
1. what the hell is conditioned reflexes?
2. what is the function of the midbrain?
3. can u tell me examples of continous and discontinous variations other than height and blood group?
4. what is the water cycle?i don't have it
5. what are the effects of deforestation?
6. what is biological control?
7. what is the function of companion cells?
8. what is negative and positive feedbacks, with examples please?and what is the difference between them?
i know they are alot but i realllllllllllllllllllllllllllllllly hate this subject and i don't get anything and the exam is tomorow
so many thanks for any contribution
--- End quote ---
k a companion cell is located in the pholem vessel....since the pholem cell only has cytoplasm the companion cell provides the phloem cell with with all its ncessaries :)
effects of deforestation....soil erosion because nw the soil is not anchord.....the percentage of CO2 in creses as no plnt to take CO2 n convert it into O2...this can lead to global wrmin whi ch will lead to the rise in sea level due to the meltin of the polar caps
continuos varition is body mass n discontionus is the ability to roll ur tongue
n by the conditiond reflexes do u mean the reflex arc???
aneways reflex arc wrks like this....first when u suppose touch a hot plate the receptor will pick it up n the messege will b ppsd on by the sensory nurone ....the dendrites of the sensory neurone picks it up passe it on to the cell body n then the axon picks it up to pass it on to teh relay neurone then agn the dendrites picks it up passes to the cell body of the relay neurone n the the axon takes it away form teh cell body n passes to the motor neurone where agn the dendrites pick it up passes on to the cell body n then axon take it to the effectos eg muscel which then contercts to mov ethe hand away....(any correction is welcomed)
hope this helps..ahh i am in lub wif this ;)
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