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eRevision.uk

This test is run by guest.
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1. Cells and microscopes Reorder

Running Total

Attempt

1 of 3

Drag and drop the boxes into the correct order.

An onion is made up of layers. Between each layer is a thin skin that is just one cell thick.

Put these steps in the correct order to give step-by-step instructions for preparing a microscope slide using this skin.

Place the slide onto the stage of the microscope.
Use the clips to hold the slide in place and your slide is ready for viewing.
Carefully lower a clean coverslip onto the slide.
Place the piece of skin onto the microscope slide and make sure it is flat.
Use a piece of filter paper to soak up any excess liquid from around the coverslip.
First use a pipette to put one drop of water onto a clean microscope slide.
Then separate one of the thin layers of the onion and use forceps to remove the thin skin from the surface of the onion layer.
Put a drop of iodine solution onto the onion tissue to stain it brown.

This is your 1^st attempt! The marking algorithm gives more marks for getting the right order first time.

Pass Mark

70%