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Biology; Chemistry; Physics: Post your doubts here!

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http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Biology (5090)/5090_s03_qp_6.pdf
Help needed with question 3 part c......... Plz give a in depth detail if possible ..... ;-(

most touch receptors are present at the finger tips and as they are closer together, a more accurate result is identified by the brain ie there are two points, not one.
as the distance from finger tips increases, the number of receptors per unit area decrease, and the result identified by the brain is more inaccurate.
 
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Can someone tell me how to examine a leaf under microscope to find where chloroplast are found.....
And also the examine of pollen grains ..... It would be very helpful....
 
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Please answer this question asap! Exam tomorrow!
Its from M/J 2011 Question 2!
 

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Please answer this question asap! Exam tomorrow!
Its from M/J 2011 Question 2!

had trouble with this earlier
its easy
you have the scale..then you measure the pollen grain which will be approx 28mm
then you divide 28 by 0.05(scale) and youll get yuor answer!! :p
 
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had trouble with this earlier
its easy
you have the scale..then you measure the pollen grain which will be approx 28mm
then you divide 28 by 0.05(scale) and youll get yuor answer!! :p
But when you measure pollen grain it is 56 mm .......
 
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But when you measure pollen grain it is 56 mm .......
dude...its the same then
look the pollen grain comes into the scale of 0.05 twice so that makes its length here 0.1 mm
then you divide 56 by 0.1 mm
or just measure the length of the grain on the line and compare like the way i said earlier to get you r answer..:)
 
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had trouble with this earlier
its easy
you have the scale..then you measure the pollen grain which will be approx 28mm
then you divide 28 by 0.05(scale) and youll get yuor answer!! :p
Hats off for such a quick response. Thanks alot!
 
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dude...its the same then
look the pollen grain comes into the scale of 0.05 twice so that makes its length here 0.1 mm
then you divide 56 by 0.1 mm
or just measure the length of the grain on the line and compare like the way i said earlier to get you r answer..:)
Two Questions,

1) Answer is 560! what would be prefix or suffix(x560 or 560mm)
2)Magnification has no units right?
 
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Two Questions,

1) Answer is 560! what would be prefix or suffix(x560 or 560mm)
2)Magnification has no units right?

magnification has no unites : correct

and it would 560x or 560 times but NOT 560mm...i repeat NOT 560mm...:)
 
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