The biggest risk when making a slide of onion skin cells is . .

• getting air bubbles under your coverslip.

• forgetting to stain the cells.

• cutting your finger on the slide or coverslip.

• getting the stain on your school uniform.

When we make slides of cells, we use stains to . . .

• make the cells more visible.

• stop the cells from moving.

• hold the coverslip in place.

• stop respiration in the cell.

Charlie and Isobel have accurately drawn biological diagrams of the same slide of cells under different magnifications. Whose microscope has the highest total magnification setting, and how can you tell?

Select the name of a student and an explanation.

• Charlie

• Isobel

• There are fewer cells in the field of view, and they are more detailed.

• There are more cells in the field of view, and they are less detailed.

Cells are mounted onto a microscope slide and covered with a ___________.

• coverslip

• cover

• slide

• plastic

What is part A on the labelled diagram of the microscope?

• eyepiece lens

• stage

• stage clip

• light source

What is part F on the labelled diagram of the microscope?

• eyepiece lens

• stage

• stage clip

• light source

Which symbol is missing from the equation for total magnification?

total magnification = objective lens magnification ____ eyepiece lens magnification

• ×

• ÷

• +

• –

Calculate the total magnification of a microscope with a 10X objective lens magnification and a 4X eyepiece lens magnification.

• 40X

• 4X

• 400X

Calculate the total magnification of a microscope with a 20X objective lens magnification and a 4X eyepiece lens magnification.

• 80X

• 8X

• 800X

• 16X

Calculate the total magnification of a microscope with a 20X objective lens magnification and a 10X eyepiece lens magnification.

• 200X

• 2X

• 2000X

• 20X