SCIENCE 7-QUARTER 2- QUIZ 2

When viewing a sample of onion cells using a microscope, a drop of iodine solution is placed on the onion cells.

Select two reasons why this is so.

• To see the cells more clearly.

• To keep the onion cells flat.

• To protect the onion cells.

• Onion cells contain starch

The diagram shows a microscope. What is the part labelled X and what is its function?

• The mirror and its function are to shine a light on the glass slide.

• The objective lens and its function is to allow you to see a clear, magnified image

• The stage and its function is to hold the glass slide

• The coarse adjustment and its function are to allow you to see a clear, magnified image.

Which one of the following instruments would you use to see a plant cell?

• Microscope

• Periscope

• Kaleidoscope

• Telescope

The diagram shows a laboratory microscope.

What are the functions of parts labelled A and B?

• A: To magnify the object.

  B: To hold the slide on the stage.

• A: To adjust the fine focus.

  B: To hold the slide on the stage.

• A: To magnify the object.

  B: To illuminate the object being viewed.

• A: To adjust the coarse focus.

  B: To illuminate the object being viewed.

In the laboratory, onion cells are investigated using a microscope. Onion cells are difficult to see, so a dye is added to the onion cells. What is this dye called?

• Salt solution

• Iodine solution

• Hydrochloric acid

• Water

Which two parts of a microscope combine to give a magnified view of a cell?

• Eyepiece and focus knob

• Stage and eyepiece

• Eyepiece and objective lens

• Light source and objective lens

The photo shows a light microscope used by many schools.

• Mirror ➞ objective lens ➞ eyepiece ➞ slide

• Mirror ➞ slide ➞ objective lens ➞ eyepiece

• Mirror ➞ eyepiece ➞ objective lens ➞ slide

• Slide ➞ eyepiece ➞ objective lens ➞ mirror

When viewing onion cells under a microscope, a few drops of a certain solution are added to stain the cells and show these cells more clearly. Select the correct solution that you should use from the list below.

• Iodine solution

• Sugar solution

• Soap solution

• Salt solution

When looking at an onion cell under a microscope, a thin slice of onion tissue is placed on a slide, a small drop of dye is placed on the tissue. What should be done next?

• The onion is cut into thin slices.

• The coarse focus is adjusted until the cells become visible.

• A coverslip is placed over the onion tissue.

• A drawing of the onion cells should be made.

For lowering the body tube until the objective is 0.25 inches from the object, we use

• illumination

• Stage

• diaphragm

• coarse focus