Question

A cheek cell is 0.025 mm long. When seen through a microscope that magnifies 400 times, how long (in mm) will it appear?

Describe how you would prepare a slide of onion peel and observe it under a compound microscope. Name one stain you could use and write what you would see.

About 350 years ago, a Dutch cloth merchant made tiny but powerful lenses and looked at a drop of rain water. He was amazed to see many tiny creatures moving about. Today, students in a school lab place a drop of pond water on a slide and observe it with a compound microscope fitted with a 10× eyepiece and a 10× objective. They see a slipper-shaped organism covered with tiny hair-like cilia, and some small green organisms with a whip-like tail.