A level Biology: Post your doubts here!

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Studydayandnight

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Can anyone please explain this??

Correct answer is D.
 

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Studydayandnight

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Also, this question, please! Question 28.

Correct answer is C.
 

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princess Anu

princess Anu

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qwertypoiu said:
Yeah of course stopwatch...
But we cannot have so many significant figures..
Because our finger pressing stop button is not very precise...
54.85 seconds seems to imply you're certain to this many decimal places, but everytime you take a reading it won't be exactly the same.
Click to expand...
do you mean if the student had used a stopwatch then D could have been the ans?
 
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Heba A.Moety

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do error bars extend 2 standard errors above and 2 standard errors below the mean value or only one above and 1 below?!
 
lara dalal

lara dalal

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Why is the answer D? How can secondary structure have ionic bonding. Doesnt it have hydrogen only
Screenshot_2015-05-07-21-35-49-1.png
 
qwertypoiu

qwertypoiu

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princess Anu said:
do you mean if the student had used a stopwatch then D could have been the ans?
Click to expand...
No not at all!
Rather my previous message meant even if he used the stopwatch he cannot do decimal places. Simply because repeating the experiment usually gives different decimals each time. Even for measuring fixed times like oscillations in physics, our values are always inaccurate on stopwatches because our reaction times are poor.
 
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