GCSE AQA Biology Cell Structure: Figure 3 shows a microscope.

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Question

Figure 3 shows a microscope.

Draw one line from each part of the microscope to the function of the part.

Part of the microscope    Function

To adjust the focus of the microscope

A

To direct light into the viewer’s eye

B

To hold a slide in place

C

To magnify the image of a specimen

To support the microscope

Why was iodine solution added to the layer of onion cells?

Tick (✓) one box.

To dry the cells

To separate the cells

To stain the cells

Why was a thin layer of onion cells used?

Tick (✓) one box.

To allow light to pass through the cells

To allow oxygen to pass through the cells

To allow water to pass through the cells

The student was worried about using a sharp knife to cut the onion.

The student wrote a risk assessment for using a knife.

Draw one line from each part of the risk assessment to the description of the part.

Part of risk assessment    Description

Call a first aider

Hazard

Cut the onion on a chopping board

The onion is cut into pieces

The knife is sharp

Line A–B in Figure 4 shows the length of cell Z.

Calculate the real length of cell Z.

Complete the following steps.

Measure the length of line A–B in millimetres (mm).

Length of line A–B = _________________ mm.

Give your measurement of the length of line A–B in micrometres (μm).

1 mm = 1 000 μm

Length of line A–B = _________________ μm.

Calculate the real length of cell Z.

Use the equation:

real length of cell Z (in μm) = length of line A–B (in μm) / magnification

Real length of cell Z = _________________ μm.

How would onion cells look different if they were seen using an electron microscope?

Tick (✓) two boxes.

The cells would be coloured.

The cells would have no nuclei.

The cells would look larger.

The cells would look more blurred.

The cells would show more internal structures.

Figure 4 is repeated below.

Figure

Cell Z

A

B

×400

Figure 3 shows a microscope - AQA - GCSE Biology - Question 4 - 2010 - Paper 1

Worked Solution & Example Answer:Figure 3 shows a microscope - AQA - GCSE Biology - Question 4 - 2010 - Paper 1

Draw one line from each part of the microscope to the function of the part.

Why was iodine solution added to the layer of onion cells?

Why was a thin layer of onion cells used?

Part of risk assessment Description

Measure the length of line A–B in millimetres (mm).

Give your measurement of the length of line A–B in micrometres (μm).

Calculate the real length of cell Z.

How would onion cells look different if they were seen using an electron microscope?

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