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 the start. Diagram 2 shows the pollen grains 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 )
$$10{\text{ }}mm{h^{-1}}$$
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