The diagram shows a graduated slide, with divisions of 0.1 mm viewed using an eyepiece graticule.
Pollen grains were grown in a sugar solution and viewed using the eyepiece graticule. Diagram 1 shows the pollen grains at first and diagram 2 shows them after four hours.
What is the growth rate of the pollen tubes?

$5\mu m{h^{-1}}$
2 )
$10\mu m{h^{-1}}$
3 )
$5{\text{ }}mm{h^{-1}}$
4 )
$10mm{h^{-1}}$
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