GRADE 7- 2nd Quarter (RUQA)

Based on the diagram and description, if you are a lab scientist observing a water sample, after you are done, what is the safest and most correct way to put the microscope away?

• Turn off the light, leave the high-power objective in place, and carry it by the eyepiece.

• Leave the light on for the next user, lower the stage, and carry it by the stage.

• Turn off the light, lower the stage, wrap the cord loosely around the base, and carry it with one hand.

• Turn off the light, rotate the lowest power objective into place, lower the stage, and carry it with two hands

You are focusing on a specimen and see a blurry image. Which part of the microscope (from the illustration) should you use first to make the image sharper without risking damage?

• Eyepiece

• Arm

• Coarse Focus Knob

• Light Source

The following are the labeled parts of the microscope paired with its function correctly, EXCEPT.

• Label A: where the viewer looks the magnified image of the specimen

• Label D: it collects and focuses the light from the mirror to the specimen

• Label F: where the mounted slide is placed

• Label G: it reflects light from an external light source

Looking at the illustration, which part holds the slides in place and allows light to pass through the specimen from below?

• Eyepiece

• Arm

• Stage

• Light Source

During a class activity, your friend forgets to lower the stage before storing the microscope. Why is this a problem?

• The light stays on longer

• It saves space in the cabinet

• It makes the microscope lighter

• The lenses might touch and scratch each other

Can the microscope still be in function if you remove the part labeled with G?

• Yes, because this part is not necessary for the microscope thus removing it is a must.

• Yes, because the light will automatically reflect towards the objective lens even without this part.

• No, because this part plays a role in reflecting the light source towards the specimen.

• No, because there will be no surface for the specimen to be placed if we remove this part.

You are observing onion cells in a lab experiment. What technique should you use first to see the cells clearly?

• Use high power lens right away

• Shake the slide vigorously

• Turn off the light completely

• Add a drop of water and cover with a slip

In a team discussion, identify the cell part that acts like a boss controlling activities. What is it?

• Cell membrane

• Nucleus

• Cytoplasm

• Mitochondria

Imagine sketching what you see under the microscope. Which part looks like a jelly filling inside the cell?

• Nucleus

• Chloroplasts

• Cytoplasm

• Cell membrane

During observation, you notice green dots in plant cells. What are these and their function?

• Mitochondria, make energy

• Nucleus, store water

• Chloroplasts, make food from sunlight

• Cytoplasm, protect the cell