Another Biology MCQ

[abcde]

AOA!
I encountered another problem of a similar nature to my previous post. Please look at question 25 of this paper: http://www.xtremepapers.net/CIE/Cambrid ... 6_qp_1.pdf
Both the mark schemes for this very paper state that the answer is C.
1. http://www.xtremepapers.net/CIE/Cambrid ... 6_ms_1.pdf
2. http://www.xtremepapers.net/CIE/Cambrid ... ms_1_2.pdf

I think that's impossible since a ball-and-socket joint cannot extend! What do you think is the right answer and why?

JazakAllah!

 

[Nibz]

HAHAHA
The examiner report says it all!

 

[Nibz]

But there's no other option

 

[abcde]

I thought that since biceps and triceps are antagonistic muscles, they cant relax at the same time! You say they do? :O

 

[Nibz]

NOOOOOOOOOO :x
I said or koi option nai hosakta!!
C is the only possible answer! (Ignoring the extension of ball and socket)

 

[abcde]

Yeah. I think so, too.

 

[OakMoon!]

Should I explain or do you get it 'abcde'? I don't want to but in this time.

 

[scouserlfc]

hahahahahahhaha do it yaar do it.

 

[OakMoon!]

I don't think so I will. There seems no need. Btw, NIBZ, the examiner report further confuses the question. According to the examiner report explanation the answer should be D.

 

[abcde]

Yes exactly hamidali391! That's the very reason I posted the question here so what do you think?

 

[Nibz]

Matlab mistake hey!

 

[scouserlfc]

i dont know a lot abt this as i havent yet studied this but i know that Biceps and triceps never relax together or contract so now it becomes a 50-50 as A and D are removed.

so the answer is C as the ball and socket joint never rotates when a person jumps. Because i dont know much i still arrived to the answer, but this is how a crazy person would do so is the answer C.

 

[Nibz]

Someone said RECENTLY that examiners can't be wrong! :roll: :lol:

 

[scouserlfc]

hey am i wrong i didnt know that please tell me.

 

[scouserlfc]

so it is correct and yes i did say it and it is indeed correct

 

[Nibz]

You say the examiner is right? :ugeek:

 

[Nibz]

But why on earth are there two mark schemes for this particular paper?

 

[scouserlfc]

IT might be there because in the previous one the examiner made a mistake and in this one he corrected it yaar after all examiner bhi insaan hai and my comment was never in this sense try to understnd.

 

[Nibz]

All the answers in both the mark schemes are SAME!

 

[OakMoon!]

I believe the answer should be C. Antagonistic muscles have to work opposite each other no matter what. Its obvious that biceps relax when a person moves in this postition and so the triceps contracts. As far as the ball and socket joint is concerned, even though it rotates, writing it as being extended will not be wrong. So the C is the perfect answer and not only because its the only choice. Actually, it should have been hinge joint instead of the ball and socket joint. But what I said makes total sense. If you look at the arm it actually extends, you can write it as being rotated or being extended. The examiner has just gone against his own marking scheme. *confusing*
This is my point of view, you can definitely email cambridge regarding this problem. And surely they'll correct this problem or correct the er.