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IB Biology: A2.2-Measuring Cells

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Biology

9th - 12th Grade

Used 24+ times

IB Biology: A2.2-Measuring Cells
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10 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the purpose of calibrating the eyepiece graticule?

To determine the actual length of eyepiece units using a stage micrometer.

To enhance the brightness of the microscope image.

To adjust the focus of the microscope lens.

To measure the temperature of the specimen.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What units are used to measure cells?

Metres

Centimetres

Millimetres

Nanometres

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the process to measure a cell in eyepiece units?

Calibrate the eyepiece units with a stage micrometer to determine the length of one eyepiece unit, then multiply the length of one eyepiece unit by the eyepiece measurement.

Use a ruler to measure the cell directly under the microscope.

Estimate the size of the cell based on the magnification of the microscope.

Count the number of cells in a given area and divide by the area to find the average size.

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How is the eyepiece graticule calibrated?

By superimposing the images of both the eyepiece graticule and stage micrometer and counting the eyepiece units that correspond to 0.1mm.

By measuring the distance between two known points on the stage micrometer without any superimposition.

By adjusting the focus of the microscope until the graticule is clear and visible.

By using a digital caliper to measure the eyepiece units directly.

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How do you convert from mm to µm?

Multiply the length in mm by 1000 to convert to µm.

Divide the length in mm by 1000 to convert to µm.

Add 1000 to the length in mm to convert to µm.

Subtract 1000 from the length in mm to convert to µm.

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What are the subdivisions of a stage micrometer?

0.1mm and 0.01mm

0.5mm and 0.05mm

1mm and 0.1mm

0.2mm and 0.02mm

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What instruments are used to measure cells?

The eyepiece graticule and stage micrometer

The microscope and petri dish

The pipette and test tube

The spectrophotometer and centrifuge

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