Biology; Chemistry; Physics: Post your doubts here!

[ayeshaK]

It's okay

Mcq no 18 ?

 

[screamingskull]

Okay i get it thankyou !!
And mcq no 18 ?

Okay The answer is C because the tube at Q is longer and will suck and tube Q is from where the air will be taken in by the man and it will be exhaled in tube P ( note that the tube connected to the mouth at P is longer than the one leading outside) therefore the exhaled air at P will have more percentage of carbon dioxide than the environmental % that is 0.03-0.04%

Hope this helped

 

[ayeshaK]

Okay The answer is C because the tube at Q is longer and will suck and tube Q is from where the air will be taken in by the man and it will be exhaled in tube P ( note that the tube connected to the mouth at P is longer than the one leading outside) therefore the exhaled air at P will have more percentage of carbon dioxide than the environmental % that is 0.03-0.04%

Hope this helped

Okay thankyou i get it

 

[Rimsa]

whats the difference between ulna and radius?

 

[Rimsa]

question 29. summer'07
http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Biology (5090)/5090_s07_qp_1.pdf

and what do nitrogen-fixing bacteria do? they are same as bacteria in root nodules?

 

[The Master]

I HATE PHYSICS.

 

[The Master]

Re: Biology,Chemistry & Physics Help Available Here !

Potential Difference :
It exits between two points. For example point A has 3V and point B has 5V. So we say that a potential difference of 2V is established between the two points.

Sorry but i didnt understand that

 

[convent2012]

REVISION CHECKLIST FOR BIOLOGY EXISTS ???? IF SO THAN WHERE CAN I FIND IT ????

 

[Vogue]

whats the difference between ulna and radius?

they r two different bones of arm. i dont think that there is any specific question abt dem, isn't it?

 

[screamingskull]

whats the difference between ulna and radius?

Radius and ulna are two bones running parallel to each other along the forearm. The one running along the side of the little finger is called ulne while the other is the radius.

 

[screamingskull]

question 29. summer'07
http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Biology (5090)/5090_s07_qp_1.pdf

and what do nitrogen-fixing bacteria do? they are same as bacteria in root nodules?

By the way it is Q 30. The answer is C
The nitrogen fixing bacteria converts the atmospheric nitrogen to ammonia. The bacteria in root hair nodules also convert the nitrogen in the nitric acid and NO2 to ammonia

 

[bogus]

REVISION CHECKLIST FOR BIOLOGY EXISTS ???? IF SO THAN WHERE CAN I FIND IT ????

cambridge students site

 

[convent2012]

cambridge students site

i did find it for physics,maths and chemistry .but not for bio ...
check out here
http://www.cambridgestudents.org.uk/subjectpages/biology/folder.2005-03-15.1931915574/

 

[Rimsa]

By the way it is Q 30. The answer is C
The nitrogen fixing bacteria converts the atmospheric nitrogen to ammonia. The bacteria in root hair nodules also convert the nitrogen in the nitric acid and NO2 to ammonia

ohh. my bad =P
thanku

Radius and ulna are two bones running parallel to each other along the forearm. The one running along the side of the little finger is called ulne while the other is the radius.

thanks again

they r two different bones of arm. i dont think that there is any specific question abt dem, isn't it?

many mcq's ask us to put they bones in order. i wanted to confirm if ulna should be placed after humerus or radius :x

 

[ayeshaK]

whats the difference between ulna and radius?

Radius= the bone of the forearm that extends from the side of the elbow to the thumb side if the wrist .it exceeds theulna in lenght and size
Ulna= placed in the middle side of the forearm parallel with raius
http://www.google.com.pk/search?um=....4.8.1.412.2001.2-6j0j1.7.0...0.0.aSRfrsw8m20
I hope this helps !!
Also notes if u need
http://www.scribd.com/doc/15587605/Support-Movement-and-Locomotion

 

[Rimsa]

Radius= the bone of the forearm that extends from the side of the elbow to the thumb side if the wrist .it exceeds theulna in lenght and size
Ulna= placed in the middle side of the forearm parallel with raius
http://www.google.com.pk/search?um=1&hl=en&client=safari&tbo=d&biw=768&bih=928&tbm=isch&sa=1&q=arm bones&oq=arm bones&aq=f&aqi=g10&aql=&gs_l=img.3..0l10.11362.20349.0.20479.28.16.7.4.8.1.412.2001.2-6j0j1.7.0...0.0.aSRfrsw8m20
I hope this helps !!

thanku sooo muchh
yep it did =)

 

[Rimsa]

iodine test and benedict test both give negative results in xylem and phloem. right??

 

[ayeshaK]

thanku sooo muchh
yep it did =)

http://wizznotes.com/wp-content/uploads/2012/02/image0052.png
This diagram might help also !!

 

[Rimsa]

http://wizznotes.com/wp-content/uploads/2012/02/image0052.png
This diagram might help also !!

whats insertion? :S

 

[ayeshaK]

iodine test and benedict test both give negative results in xylem and phloem. right??

Xylem will give negative in both iodine and benedict !! But i guess phloem will give negative in iodine but benedicts would be positive because phloem has sugars !! ?