liamlarner
Badges: 12
Rep:
?
#1
Report Thread starter 10 months ago
#1
I Need help with this 4 marker grade 9 microscope practical question for GCSE Biology AQA Triple from my grade 8/9 booster collins workbook

3) Matilda is using a light microscope to view cheek cells.She uses an eyepiece graticule.
Describe how matilda could use an eyepiece graticule to measure the size of a cheek cell (4 marks)

i just don't understand how you measure cells using a light microscope is this a A Level Biology question but just at GCSE
0
reply
flowerscat
Badges: 10
Rep:
?
#2
Report 10 months ago
#2
An eyepiece graticule is calibrated with a stage micrometer, for a particular magnification. This allows you to work out what each division of the eye piece graticule corresponds to (in micrometers). You only do this once for every microscope.

When you need to measure the size of a cheek cell, place the eye piece graticule in the eyepiece.
Place the cheek cell on the stage.
At 10 x magnification, work out how many lines on the graticule line up with the width of the cheek cell (the widest point).
Multiply the number of lines (graticule) by the value of each division (say 0.01 um). This will give you the width of the cheek cell in micrometers (um)
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

Should there be a new university admissions system that ditches predicted grades?

No, I think predicted grades should still be used to make offers (727)
33.8%
Yes, I like the idea of applying to uni after I received my grades (PQA) (921)
42.82%
Yes, I like the idea of receiving offers only after I receive my grades (PQO) (408)
18.97%
I think there is a better option than the ones suggested (let us know in the thread!) (95)
4.42%

Watched Threads

View All