Home / iGCSE Biology (0610) 2.2 Size of specimens iGCSE Style Questions Paper 1

iGCSE Biology (0610) 2.2 Size of specimens iGCSE Style Questions Paper 1

Question

A pollen grain was viewed with a microscope using ×500 magnification. The image size of the pollen grain was measured as 75mm. Which calculation would give the actual size of the pollen grain in millimetres?

A) \(\frac{75}{500}\)

B) \(\frac{500}{75}\)

C) \( \frac{75\times 1000}{500}\)

D) \( \frac{500}{75\times 1000}\)

▶️ Answer/Explanation
Solution

Ans: A

The actual size of an object under a microscope is calculated using the formula:

\[ \text{Actual Size} = \frac{\text{Image Size}}{\text{Magnification}} \]

Given the image size is \(75\,mm\) and magnification is \(500\), the actual size is:

\[ \frac{75}{500} \]

Thus, the correct answer is A.

Question

The diagram shows a fly.

The line XY represents the length of the wing. The length of line XY is 26mm. The actual size of the wing between X and Y is 4mm. What is the magnification of the diagram?

A) ×0.15

B) ×6.5

C) ×22

D) ×104

▶️ Answer/Explanation
Solution

Ans: B

Magnification is calculated using the formula:

\[ \text{Magnification} = \frac{\text{Size of Image}}{\text{Actual Size}} \]

Here, the image size (XY) is 26 mm, and the actual wing size is 4 mm. Plugging in the values:

\[ \text{Magnification} = \frac{26\, \text{mm}}{4\, \text{mm}} = 6.5 \]

Thus, the correct answer is B (×6.5).

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