|Crab apple blossoms in bloom. The yellow anthers hold the pollen in readiness for insect to collect. Insects move the pollen amongst the flowers. The transfer of pollen from one flower to another is called pollination.
Crab apple blossoms are the first to appear in this orchard. You can see that apple trees in the background are not in blossom just yet. A honey bee is on the move amongst these blossoms (out of focus though). Yellow pollen from these flowers was visible on the legs of this honey bee.