The image shows a pollen grain from a grass plant.
The image has a length of 60mm. The actual length of the pollen grain is 500 μm. What is the magnification of the pollen grain?
A) ×0.12
B) ×30
C) ×120
D) ×30 000
▶️ Answer/Explanation
Ans: C
Magnification is calculated using the formula:
\[ \text{Magnification} = \frac{\text{Image Size}}{\text{Actual Size}} \]
First, convert units for consistency:
Image Size = 60 mm = 60,000 μm
Actual Size = 500 μm
Thus, Magnification = \(\frac{60,000}{500} = 120\).
Therefore, the correct answer is C (×120).
The diagram shows an epidermal cell from an onion plant. The distance between X and Y on the diagram is 60 mm. The actual length of the cell between X and Y is 150 μm.
What is the magnification of the cell?
A) ×40
B) ×250
C) ×400
D) ×2500
▶️ Answer/Explanation
Ans: C
Magnification is calculated using the formula:
\[ \text{Magnification} = \frac{\text{Image Size}}{\text{Actual Size}} \]
First, convert both measurements to the same unit (micrometers, μm):
\[ \text{Image Size} = 60 \, \text{mm} = 60,000 \, \mu\text{m} \]
\[ \text{Actual Size} = 150 \, \mu\text{m} \]
Now, plug the values into the formula:
\[ \text{Magnification} = \frac{60,000}{150} = 400 \]
Thus, the magnification is ×400, which corresponds to option C.