Every 2 kg of pollen is sampled to check that the pollen is viable (still able to pollinate female flowers). Samples of pollen are put in sugar solution for 2 hours, then examined under a microscope to see how many pollen tubes have grown. A viability of at least 80%, which is 80 pollen tubes per 100 pollen grains, is needed for the pollen to pass the test.
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