CAIE A-Level Biology A2 M 3 Magnification Actual Size and Geometry Questions

Calculate magnification and actual size from scale information, using proportional geometry to interpret biological images accurately in Cambridge A Level Biology questions.

Exam points

Calculate magnification and actual size from scale information, using proportional geometry to interpret biological images accurately.

[Maximum number: 2]

Fig. 6.1 is a diagram of mitochondrion.

Fig. 6.1

Assume that the mitochondrion in Fig. 6.1 is a cylinder.

Calculate the surface area of this mitochondrion.
Use the formula: Surface area of cylinder $=2 \pi r^{2}+2 \pi r h$
Show your working.

\text{surface area = }\underline{\hspace{4cm}}\,\mu\mathrm{m}^{2}

b(ii)

$\left(2 \times \pi \times 0.36^{2}\right)+(2 \times \pi \times 0.36 \times 5.25)$

or

$2 \pi \times 0.36(0.36+5.25) ;$

12.7

or

12.68

or

12.69 ;

Marking guidance:

accept 3.14 or $\pi$ in workings

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CAIE A-Level Biology A2 M 3 Magnification Actual Size and Geometry Questions question 1