Measurements, Microscopes & Scale — Drills · Grade 7 Science
Chapter: Scientific Inquiry & Diversity of LifeWhat these drills covers
By the end of Measurements, Microscopes & Scale you should be able to:
- I can explain measurements, microscopes & scale.
- I can use evidence, a model, and stated assumptions to support a biological explanation.
4 questions, multiple choice, numeric and written answer, each with a worked explanation.
Vocabulary used: magnification, resolution, micrometer, scale bar, calibration.
Problem 1
Which improves the ability to separate nearby details?
- A larger caption
- Resolution
- Changing the real cell size by focusing
- Removing units
Answer and explanation
Resolution
Resolution concerns distinguishable detail, whereas magnification concerns enlargement.
Problem 2
A 10× eyepiece and 25× objective give what total magnification?
Answer and explanation
250 ×
10×25=250×.
Problem 3
Why is “a cell is 20 long” incomplete?
Answer and explanation
It omits the unit and measurement method. A cell might be 20 micrometers long, but the number alone cannot establish its size.
Problem 4
A cell image is half the length of a 100-micrometer scale bar. What size is supported?
Answer and explanation
Its estimated length is 50 micrometers, assuming the bar belongs to that image and both are measured in the same direction.