1. Fig.1 shows Asterionella, microscopic algae that live in fresh water.

Fig.1

(i) Make a large outline drawing of the algae. Do not label your drawing.

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(ii) A copy of Fig.1 is shown below with a ruler, graduated in cm, added.

                                                          Fig.1                                           ×425

Measure the length of the line AB in Fig.1 Include the unit.

Use the formula to calculate the actual diameter of the algae shown in Fig.1 Include the units.

$magnification=\frac{lengthoflineAB}{actualdiameterofalgae}$

Show your working.

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