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A cheek cell is 70μm and a red blood cell 7 μm - OCR Gateway - GCSE Biology - Question 15 - 2021 - Paper 1

Question 15

A cheek cell is 70μm and a red blood cell 7 μm. What is the order of magnitude difference between a cheek cell and a red blood cell? A 0 B 1 C 2 D 3

Worked Solution & Example Answer:A cheek cell is 70μm and a red blood cell 7 μm - OCR Gateway - GCSE Biology - Question 15 - 2021 - Paper 1

Step 1

Calculate Size Difference

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Answer

To find the order of magnitude difference, we first determine the sizes of both cells. A cheek cell measures 70 μm and a red blood cell measures 7 μm. The ratio of the sizes can be calculated as:

$ext{Size Ratio} = rac{70 ext{ μm}}{7 ext{ μm}} = 10$

Step 2

Determine the Order of Magnitude

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Answer

The order of magnitude difference can be assessed by checking the exponent when expressing the size ratio in power of 10. Since:

$10^1 = 10$

The order of magnitude difference is thus 1.

Step 3

Select the Correct Answer

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Answer

Based on the calculations, the order of magnitude difference between a cheek cell and a red blood cell is 1. Therefore, the correct answer is B.

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A cheek cell is 70μm and a red blood cell 7 μm - OCR Gateway - GCSE Biology - Question 15 - 2021 - Paper 1

Worked Solution & Example Answer:A cheek cell is 70μm and a red blood cell 7 μm - OCR Gateway - GCSE Biology - Question 15 - 2021 - Paper 1

Calculate Size Difference

Determine the Order of Magnitude

Select the Correct Answer

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