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Question 18

A student measures the size of a circular zone of inhibition on an agar plate using a ruler. The left edge of the circular zone aligns with the 2.0 cm mark on the ruler, and the right edge aligns with the 10.0 cm mark.

What is the closest estimate of the area of this zone of inhibition?

(Use the formula: $Area=πr2\text{Area} = \pi r^2$ where $π=3\pi = 3$ )

$cm224\text{ cm}^2$

$cm248\text{ cm}^2$

$cm275\text{ cm}^2$

$cm2192\text{ cm}^2$

Markscheme

Practical skills Questions

GCSE
Biology
Practical skills

44 exam-style questions on OCR GCSE Biology Practical skills. Each one has a worked solution and a mark scheme showing where the marks go.

Practical skills

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

Question 18

What is the closest estimate of the area of this zone of inhibition?

(Use the formula: $Area=πr2\text{Area} = \pi r^2$ where $π=3\pi = 3$ )

$cm224\text{ cm}^2$

$cm248\text{ cm}^2$

$cm275\text{ cm}^2$

$cm2192\text{ cm}^2$

Markscheme

Practical skills Questions

GCSE
Biology
Practical skills

44 exam-style questions on OCR GCSE Biology Practical skills. Each one has a worked solution and a mark scheme showing where the marks go.