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AS BIOLOGY P-33

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In the paper questions like suggest 3 modifications or list out 2 errors, can we write more than what they ask? like more than 3 modifications or errors.
 
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In the paper questions like suggest 3 modifications or list out 2 errors, can we write more than what they ask? like more than 3 modifications or errors.
its better not to waste tym and write only wat they have asked...like only three modifications nd not more than that:)
 
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i hear that thiis tym the ppr will b easier than the last tym,bt the question seems to b a bit confusing
 
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Number of eyepiece graticule units: 8.75-1.50=7.25 EPG units. (You have to measure the width of the lumen.)
Now you can see on the second Fig. that 10 units of the stage micrometer are in line with 9 units on the EPG.
You've got all the information you need, now all you need to do is cross multiplication:
7.25 EPG units - x stage micrometer units
9 EPG units - 10 stage micrometer units
9x - 72.5
x - 8.1

1 unit on the stage micrometer - 0.1 mm
8.1 units - x mm
x - 0.1 x 8.1 = 0.81 mm.
 
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Number of eyepiece graticule units: 8.75-1.50=7.25 EPG units. (You have to measure the width of the lumen.)
Now you can see on the second Fig. that 10 units of the stage micrometer are in line with 9 units on the EPG.
You've got all the information you need, now all you need to do is cross multiplication:
7.25 EPG units - x stage micrometer units
9 EPG units - 10 stage micrometer units
9x - 72.5
x - 8.1

1 unit on the stage micrometer - 0.1 mm
8.1 units - x mm
x - 0.1 x 8.1 = 0.81 mm.


Thank you so much.
But what are these values written in the marking scheme? i dont really get those.From where did they get 28/29.

And when finding the value on the stage micrometer,why did you take it as 10 units,not 3mm?
 
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