5. Self-pollination happens when the pollen grain are transferred from the anther of a flower to the she ma of another flower in the same plant. 6. If both pistil and stamen are present, the flower is considered incomplete'. 7. Cross-pollination is a process that requires two individual plants of the same species. 8. When petals are in group or by set, they are called bouquet. 9. Fertilization occurs when swelling tube-like pollen grains goes into the stigma through the style to reach the ovary. 10. The most observable part of the flower in which people normally appreciate is ovule.​