BIO 225 Lab Test 1 – Practice Questions, Study Guide & Exam Review 2026

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BIO 225 Lab Test 1 – Practice Questions, Study Guide & Exam Review
2026

Ocular lenses - ANS ✔✔Eyepiece lenses located at at the top of the microscope

10x - ANS ✔✔Magnification level of each ocular lens

Objective lenses - ANS ✔✔Lenses located above the stage, mounted on the revolving nosepiece

Mechanical stage - ANS ✔✔Movable part of the microscope that acts as a platform on which to
mount slides

Scanning objective - ANS ✔✔Shortest, red-striped lens that carries the lowest magnification

4x (5x) - ANS ✔✔Magnification level of scanning objective

Low power objective - ANS ✔✔Yellow-striped lens that is the second shortest on the
microscope

10x - ANS ✔✔Magnification level of low power objective

Yellow - ANS ✔✔Color of low power objective

Red - ANS ✔✔Color of scanning objective

High power or Hi-dry objective - ANS ✔✔Second-longest objective lens that has a blue-stripe

, 40x - ANS ✔✔Magnification level of hi-dry lens

Blue - ANS ✔✔Color of hi-dry lens

Oil immersion objective - ANS ✔✔Longest objective lens

White - ANS ✔✔Color of longest objective lens

100x - ANS ✔✔Magnification level of longest objective lens

Immersion oil - ANS ✔✔Used to remove refraction when viewing items under the microscope
at 100x magnification

Condenser - ANS ✔✔Third lens system that focuses light rays from the illuminator onto the
specimen from below

Iris diaphragm - ANS ✔✔Microscope part that is adjusted to control the width of the cone of
light that gets focused onto the specimen

Illuminator - ANS ✔✔The light source at the base of the microscope

Base - ANS ✔✔Lower foundation of the microscope

Arm - ANS ✔✔Structure that supports the top section of the microscope

Slide assembly holder - ANS ✔✔Mechanism for holding microscope slides in place that includes
metal brackets and two knobs used to move slide side to side and up and down

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Uploaded on: June 30, 2026
Number of pages: 6
Written in: 2025/2026
Type: Exam (elaborations)
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