Biology; Chemistry; Physics: Post your doubts here!

[ayeshaK]

http://www.google.com.pk/search?um=....r_gc.r_pw.r_qf.,cf.osb&fp=1&biw=1366&bih=667
most seeds shown have their embryo on the top!

Ignore the big thing but inside the small thing on the boundey the lump is the radicle and just On its side is the plumule which has a leafy shape !!

 

[Spidey21]

Ignore the big thing but inside the small thing on the boundey the lump is the radicle and just On its side is the plumule which has a leafy shape !!

well he has got a point if you see those images..most of them have it coming from the top :/

 

[ayeshaK]

well he has got a point if you see those images..most of them have it coming from the top :/

Yes but the small thingy is inside the seed and during germination water enter that part and then the seed developes and the plumule and radicle grow out and come out of the testa from the top but when it comes out the plumule is known as stem and radicle as roots so if the examiner asks where the plumule and radicle are so u wuld mention the position inside because when they come out they are nt plumule and radicle any more

 

[amna shah]

12 -The mass of one mole of a chloride formed by a metal Y is 74.5g.
What is the formula of the chloride?
A: Y3Cl B: Y2Cl C: YCl D: YCl 2

ANSWER AND PLEASE EXPLAIN ??

 

[A star]

i mean no offence but i have seen people posting question over other sites though i get the rason for this but it will not stop the spread of questions

 

[amna shah]

can anyone explain MCQ 38 of chem summer 2009 paper .... why is C not an isomer ???

 

[SalmanPakRocks]

12 -The mass of one mole of a chloride formed by a metal Y is 74.5g.
What is the formula of the chloride?
A: Y3Cl B: Y2Cl C: YCl D: YCl 2

ANSWER AND PLEASE EXPLAIN ??

Answer is D
Calculate number of Moles of Y
74.5/35.5 = 2.09
therefore formula would be YCL2

 

[SalmanPakRocks]

can anyone explain MCQ 38 of chem summer 2009 paper .... why is C not an isomer ???

I guess the question your trying to ask is different from the reference your provided.

 

[Mayedah]

can anyone explain MCQ 38 of chem summer 2009 paper .... why is C not an isomer ???

C is not an isomer bcuz option A,B,and D all have side chains and have different structures but if u look at option C it has no side chain and has the same long chain jst like the structure shown in question !

 

[Vogue]

http://www.google.com.pk/search?um=1&hl=en&client=safari&tbo=d&biw=768&bih=928&tbm=isch&sa=1&q=yeast fermentation apparatus&oq=yeast fermentation a&aq=0&aqi=g1g-S9&aql=&gs_l=img.1.0.0j0i24l9.7746.8094.0.9703.2.2.0.0.0.0.255.505.2-2.2.0...0.0.O8QGHZOSR6s
The first picture in this link !! Wht in this case ? Can co2 diffuse thru oil ?

xactly i m talking abt the same experiment; the first pic..how will CO2 pass ?

 

[Talhakhan]

Hey i have done 12 years past papers of biology ATP ........... Is it enough to score 40/40 in Atp .......
Any kind of respone would be helpful....

 

[ayeshaK]

xactly i m talking abt the same experiment; the first pic..how will CO2 pass ?

Well bubbles of co2 will form and they will burst giving tha gas so carbondioxide will be released !! I guess this should be in my opinion !!

 

[ayeshaK]

Hey i have done 12 years past papers of biology ATP ........... Is it enough to score 40/40 in Atp .......
Any kind of respone would be helpful....

Yes they are enough !! and well u teally cant be sure wether u can get full marks

 

[Talhakhan]

Yes they are enough !! and well u teally cant be sure wether u can get full marks

Thanks for the response........ appreciated!!!!

 

[ayeshaK]

Thanks for the response........ appreciated!!!!

Have u done the variant papers ? If yes then can u tell me wht shape will be the graph in this paper !! ?
http://www.xtremepapers.com/papers/...nal O Level/Biology (5090)/5090_w10_qp_61.pdf
I made it and mine was making a S shape typr graph

 

[Spidey21]

Have u done the variant papers ? If yes then can u tell me wht shape will be the graph in this paper !! ?
http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Biology (5090)/5090_w10_qp_61.pdf
I made it and mine was making a S shape typr graph

well if you took light intensity on y and the co2 on x axis then your graph should be something like not a s but a curve...

 

[ayeshaK]

well if you took light intensity on y and the co2 on x axis then your graph should be something like not a s but a curve...

They have mention light intensity on X and co2 on Y !! And i made it the same way

 

[Spidey21]

They have mention light intensity on X and co2 on Y !! And i made it the same way

but i think it would be better doing the other way round...

 

[ayeshaK]

but i think it would be better doing the other way round...

N well we arent supposed to go against the mark scheme :/

 

[Talhakhan]

Have u done the variant papers ? If yes then can u tell me wht shape will be the graph in this paper !! ?
http://www.xtremepapers.com/papers/...nal O Level/Biology (5090)/5090_w10_qp_61.pdf
I made it and mine was making a S shape typr graph

Mine wasn't S shaped it was a curve shaped graph until it became constant in the end