AQA B1 Microscopy and Slide Preparation Quiz

What is the first step in preparing a slide to view onion cells?

• Add a drop of iodine solution

• Cut up an onion into layers

• Add a drop of water to a clean slide

• Place a cover slip on the slide

What is the purpose of using iodine solution when preparing a slide?

• To clean the slide

• To stain and highlight objects in a cell

• To mount the specimen

• To prevent air bubbles

Which tool is used to peel off epidermal tissue from an onion layer?

• Scissors

• Tweezers

• Knife

• Needle

What should you do to avoid air bubbles when placing a cover slip on a slide?

• Press down hard on the cover slip

• Use a dry slide

• Tilt and lower the cover slip carefully

• Add more water

What is the first step in using a light microscope to look at your slide?

• Adjust the focus with the fine adjustment knob

• Clip the slide onto the stage

• Select the highest-powered objective lens

• Look down the eyepiece

Which lens should you select first when using a light microscope?

• Highest-powered objective lens

• Medium-powered objective lens

• Lowest-powered objective lens

• Any lens available

What is the purpose of the coarse adjustment knob on a microscope?

• To adjust the light intensity

• To move the stage up and down

• To change the objective lens

• To focus the image finely

What should you do if you need to see the slide with greater magnification?

• Use the fine adjustment knob

• Swap to a higher-powered objective lens

• Adjust the light source

• Clean the eyepiece

What should you use to draw your observations under the microscope?

• A pen

• A pencil with a sharp point

• A marker

• A crayon

How much space should your drawing take up on the paper?

• At least a quarter

• At least half

• At least three-quarters

• The entire page