Experiments

Question 1

How to use a light microscope

Answer 1

Plug in + turn on
Use lowest lens 1st
Secure sllide with clips
Use course focus to bring objective lens as close as possible
Refocus each time that you change lens power
Draw diagrams

Question 2

Examining onion cells

Answer 2

Set up microscope
Place water drop on slide
Place layer of epidermal onion tissue on slide with small paintbrush
Place cover strip at 45° to prevent air bubbles
Dry + examine under microscope
Repeat using iodine instead of water

Question 3

Examining cheek cells

Answer 3

Set up microscope
Swab inside of cheeks with cotton swab + wipe on slide
Cover with water drop
Place cover strip at 45° to prevent air bubbles
Dry + examine under microscope
Repeat using methylene blue instead of water

Question 4

To demonstrate osmosis

Answer 4

Soak 2 strips of visking tubing in water
tie a knot at 1 end of each
Fill 1 with distilled water + the other with sucrose + water solution
Tie each end + dry + find mass
Place each tube in a beaker with a rod supporting them
Leave for 15 mins + find new mass