A level Biology: Post your doubts here!

[Idolfanatic95]

http://www.xtremepapers.com/papers/...and AS Level/Biology (9700)/9700_w03_qp_1.pdf
Q (29): Shudn't this be D?

 

[Idolfanatic95]

the only confusing thing is that the lung volume has to do something with todal capacity or breathing rate???
i think no. :/
in A : if we multiply number of breaths per minutes with tidal volume we get 8.4.( this is the amount of oxygen absorbed in one minute. )
in B : 9
in C: 8
in D : 6.8

B absorbs the max if ignoring lung volume

I got confused regarding the lung volume
ugh!

 

[Idolfanatic95]

http://www.xtremepapers.com/papers/...and AS Level/Biology (9700)/9700_w03_qp_1.pdf
Q (6) Im getting 5 or 6
Q (16) Why can't it be C?

 

[Mubasher96]

the only confusing thing is that the lung volume has to do something with todal capacity or breathing rate???
i think no. :/
in A : if we multiply number of breaths per minutes with tidal volume we get 8.4.( this is the amount of oxygen absorbed in one minute. )
in B : 9
in C: 8
in D :6.8
B absorbs the max if ignoring lung volume

Sorry for interrupting here, but there ws a slight mistake you made there. That answers u get by multiplying breathing rate n tidal volume are the volumes of air breathed in and out in 1 minute not oxygen absorbed. Because its stated that the efficiency here was same, the concept didnt really matter much but jxt wanted to correct that =)

 

[Idolfanatic95]

http://www.xtremepapers.com/papers/...and AS Level/Biology (9700)/9700_s04_qp_1.pdf
Q (36) I dont get this at all!!

 

[confused123]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s08_qp_1.pdf
Q 16?

see the questions asks that when will be the water potentials get same. this is only possible when the initial length to final length ratio becomes 1. this happens at C .45 mol/dm cube

 

[confused123]

Sorry for interrupting here, but there ws a slight mistake you made there. That answers u get by multiplying breathing rate n tidal volume are the volumes of air breathed in and out in 4 minutes not oxygen absorbed. Because its stated that the efficiency here was same, the concept didnt really matter much but jxt wanted to correct that =)

why sorry mate, u r helping me by correcting so plz keep doing it. wherever i am wrong or you think some point is missing, kindly identify it like you doing now.

then what's the concept here? i don't get it. will the lung volume have impact?

 

[Idolfanatic95]

Sorry for interrupting here, but there ws a slight mistake you made there. That answers u get by multiplying breathing rate n tidal volume are the volumes of air breathed in and out in 1 minute not oxygen absorbed. Because its stated that the efficiency here was same, the concept didnt really matter much but jxt wanted to correct that =)

Well thanks. any suggestion wud go just fine =]

 

[Idolfanatic95]

http://library.med.utah.edu/kw/pharm/hyper_heart1.html
This cardiac cycle here goes on pretty simple and clear.

 

[confused123]

http://library.med.utah.edu/kw/pharm/hyper_heart1.html
This cardiac cycle here goes on pretty simple and clear.

Oooh man beautiful haha. This is cool and makes it easier to remember.

 

[Mubasher96]

then what's the concept here? i don't get it. will the lung volume have impact?

As far as i understood this, lung volume has no impact. Maybe once we have the right answer we *could* make a connection. I did the same u did, multiply breathing rate with tidal vol ( the vol. of air breathed in and out in one breath). Doing so we get the amount of "air" entering lungs. Efficiency of gas exchange being same here means the ratio of oxygen absorbed is same for all but change will be becuz of air entered. More air entering, more absorption.

 

[confused123]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s04_qp_1.pdf
Q (36) I dont get this at all!!

maybe because you are not thinking hard on this one.
see the problem here is that the person who has antibodies for blood group A already can't go thru a transfusion of blood. so the people who don't have antibodies for blood group A are blood group A and AB. see the table. people with these two blood groups have no antibody for A.

B is the answer

 

[confused123]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w03_qp_1.pdf
Q (29): Shudn't this be D?

boy are you kidding me
you can see that the de-oxygenated blood has just entered into the alveolus at A. there will be almost no oxygen at A. it can't be D because blood is leaving from the alveoli. gaseous exchange took place. oxygen concentration is highest at D

 

[confused123]

http://www.xtremepapers.com/papers/...and AS Level/Biology (9700)/9700_w03_qp_1.pdf
Q (6) Im getting 5 or 6
Q (16) Why can't it be C?

no.6 i don't get it. how do we calculate this?

q.16 i think its B because all the enzyme gets used up. the independent variable is substrate concentration which we are altering , dependent is enzyme , so at w n x the reaction rate becomes zero as all enzyme molecules are being used up.

 

[inkheart]

so it means we'll describe abt crossing over in metaphase nt prophase1?????

early prophase 1

 

[Idolfanatic95]

boy are you kidding me
you can see that the de-oxygenated blood has just entered into the alveolus at A. there will be almost no oxygen at A. it can't be D because blood is leaving from the alveoli. gaseous exchange took place. oxygen concentration is highest at D

Oh dang! I was looking at it as arterial and venule end. My bad.

 

[Idolfanatic95]

no.6 i don't get it. how do we calculate this?

q.16 i think its B because all the enzyme gets used up. the independent variable is substrate concentration which we are altering , dependent is enzyme , so at w n x the reaction rate becomes zero as all enzyme molecules are being used up.

Idk about the 6th one. A frnd of mine did. i dont get it anyway :/

 

[Idolfanatic95]

http://www.biology-innovation.co.uk/pages/plant-biology-ecology/phloem/
Check this out people!
notes on transport in plants and more

 

[Idolfanatic95]

http://www.dnaftb.org/#molecules
All about DNA & RNA

 

[Idolfanatic95]

http://www.xtremepapers.com/papers/...and AS Level/Biology (9700)/9700_s05_qp_1.pdf
Q (14): Why not pick B as the correct one?
Q (6)
http://www.xtremepapers.com/papers/...and AS Level/Biology (9700)/9700_w05_qp_1.pdf
Q (30): Why B?
Q (38): Confused between A and C :-s
http://www.xtremepapers.com/papers/...and AS Level/Biology (9700)/9700_w06_qp_1.pdf
Q (1): Which structure visible is the chloroplast? and how do we go for its width?