The photograph shows a pollen tube growing in a culture medium on a glass slide. © Garry Delong / Science Photo Library Pollen grains were placed on glass slides covered in growth medium. Eight slides were incubated at $$\(24^{\circ} \mathrm{C}\)$$. After one hour, one slide was placed under a microscope and the lengths of 10 pollen tubes were measured. The measurements were repeated at hourly intervals with the remaining seven slides. The graph shows the results. Explain how changes in temperature could affect the rate of growth of pollen tubes. (2) ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................

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