B1.1 Observing cells

What are living organisms made of?

• Cells

• Dust

• Water

• Rocks

How many animal cells would fit across the width of a tiny full stop?

• About 10

• About 50

• About 100

• About 200

What did Robert Hooke use to look at a thin slice of cork?

• Telescope

• Microscope

• Magnifying glass

• Binoculars

What is the smallest unit found in an organism?

• Organ

• Tissue

• Cell

• Molecule

What do you need to do to make an observation?

• Look quickly

• Look carefully and in detail

• Look from a distance

• Look without any tools

What is the first step to observe an object using a microscope?

• Move the stage to its lowest position.

• Place the object you want to observe on the stage.

• Select the objective lens with the lowest magnification.

• Look through the eyepiece and turn the coarse-focus knob.

What part of the microscope do you look through?

• Objective lens

• Eyepiece

• Stage

• Slide

What is the total magnification if the eyepiece lens has a magnification of x10 and the objective lens has a magnification of x20?

• 100

• 200

• 300

• 400

What is the magnification of an eyepiece lens if the total magnification is 200 and the objective lens magnification is x20?

• x5

• x10

• x15

• x20

What is the magnification of an objective lens if the total magnification is 200 and the eyepiece lens magnification is x10?

• x5

• x10

• x15

• x20