Science 7 Second Quarter Examination

What is a microscope?

• A. A device used to measure temperature

• B. A tool used to observe very small objects or organisms

• C. A machine for mixing chemicals

• D. A container for storing laboratory samples

What is the function of the eyepiece (ocular lens) in a microscope?

• To adjust the focus of the microscope

• To illuminate the specimen from below

• To hold the slide in place

• To look through and magnify the specimen, usually by 10x or 15x

What is the primary function of the arm on a microscope?

• To adjust the magnification

• To illuminate the specimen

• To connect the base to the head and eyepiece tube, and to carry the microscope

• To hold the slide in place

What do the stage clips on a microscope do?

• They magnify the specimen

• They hold the slide in place on the stage

• They adjust the focus

• They connect the eyepiece to the arm

Why is it important to carry a microscope by holding both the arm and the base?

• To keep the eyepiece clean

• To ensure stability and prevent damage from dropping

• To prevent the slide from falling

• To avoid touching the lenses

While observing a specimen under a microscope, a student switches from the 4x objective lens to the 40x objective lens. The image becomes blurry. What should the student do next to regain a clear image?

• Move the stage all the way up to bring the sample closer to the lens

• Adjust the focus knob and readjust the condenser and light intensity

• Push the slide toward the edge of the stage to change the field of view

• Switch back to the lowest power objective lens and restart the process

Which of the following is the correct way to carry a microscope?

• A. Hold it by the eyepiece and base

• B. Use one hand to hold the stage and the other to support the base

• C. Carry it with both hands—one on the arm and one under the base

• D. Lift it by the objective lenses and place it on the table

Which of the following organelles is found in plant cells but not in animal cells?

• Nucleus

• Mitochondria

• Chloroplast

• Ribosomes

What is the primary function of the cell wall in plant cells?

• To store genetic information

• To control movement of substances in and out of the cell

• To provide structural support and protection

• To produce energy for the cell

Which structure is responsible for protein synthesis in both plant and animal cells?

• Lysosome

• Ribosome

• Golgi apparatus

• Smooth ER