Download N5 Cell Structure Homework

N5 Cell Structure Homework
Task 1
A microscopes field of view is 2mm in diameter. 1mm is equal to 1000 micrometers (µm).
When viewing onion skin cells under this microscope 10 cells could be seen to fill the field of
view lengthwise.
(a) Express the diameter of the field of view in µm.
(b) Calculate the average length of the onion skin cells in µm.
100 bacterial cells were counted across the field of view.
(c) Calculate the average length of the bacterial cells
(d) Express as a whole number ratio the average length of the onion skin cells to the
average length of the bacterial cells.
Total magnification is calculated as:Magnification of the eyepiece lens
X
Magnification of the objective lens
Complete the following table by calculating the magnifications
LOW POWER
MEDIUM POWER
HIGH POWER
Magnifying power of
eyepiece lens
10 times
10 times
Magnifying power of
objective lens
4 times
10 times
40 times
Total magnification
of microscope
100 times
Task 2:
Using a red pen correct this piece of pupil work about animal and plant cells using the
information you have learned.
N5 Cell Biology - 1
Cheek cell
membrane wall
mitochomdrian
cytoplasm
ribasomes
cell wall
chlorophylls
Cell
brain
Leaf Cell
Nuclues
Animal cells have a very uniform shape. They have a cell wall that
controls what goes in and out of the cell. Ribosomes are found in the
nucleus where they carry out photosynthesis.
Plant cells are irregular in shape. They have a cell membrane that gives
support to the cell. Like animal cells, they have vacuoles where energy is
produced for use by the cell. We use methylene blue to stain plant cells so
we can see them clearly under the microscope.
To make a wet mount slide you put a thin specimen on a slide and a drop
of stain. Then you drop that little glass square thing on it and look at the
slide under the highest magnification first, then the middle and low
power. To work out the magnification, you add the eyepiece to the objective
lens magnification e.g. 10x + 10x = 20x
Here are three animal cells.
N5 Cell Biology - 1
N5 Cell Biology - 1