Question

microscope parts/adjustment knob
the ____________ causes the stage to move upward or downward.
multiple choice
coarse adjustment knob
iris diaphragm
mechanical stage
objective lens

Explanation:

The coarse - adjustment knob on a microscope is used to move the stage up or down for initial focusing. The iris diaphragm controls light, the mechanical stage holds the specimen, and the objective lens magnifies the specimen.

Answer:

A. coarse adjustment knob