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The flowers of plants that make use of biotic pollen vectors commonly have glands called nectaries that act as an incentive for animals to visit the flower. Some flowers have patterns,called nectar guides,that show pollinators where to look for nectar. Flowers also attract pollinators by scent and color Still other flowers use.
The primary purpose of a flower is reproduction. Since the flowers are the reproductive organs of plant,they mediate the joining of the sperm,contained within pollen,to the ovules contained in the ovary. Pollination is the movement of pollen from the anthers to the stigma.
Some flowers with both stamens and a pistil are capable of self-fertilization,which does increase the chance of producing seeds but limits genetic variation. The extreme case of self-fertilization occurs in flowers that always self-fertilize.
Many flowers have close relationships with one or a few specific pollinating organisms. Many flowers,for example,attract only one specific species of insect,and therefore rely on that insect for successful reproduction.
There is much confusion about the role of flowers in allergies. For example,the showy and entomophilous goldenrod Solidago is frequently blamed for respiratory allergies,of which it is innocent,since its pollen cannot be airborne.
- Rosalina Pong
Flower evolution continues to the present day;modern flowers have been so profoundly influenced by humans that many of them cannot be pollinated in nature. Many modern,domesticated flowers used to be simple weeds,which only sprouted when the ground was disturbed.
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