සුළු (r2.7.1) (රොබෝ එකතු කරමින්: ne:पुष्प)
[[ගොනුව:Bees Collecting Pollen cropped.jpg|right|thumb|Grains of pollen sticking to this bee will be transferred to the next flower it visits]]
[[ගොනුව:Tulip Stamen Tip.jpg|right|thumb|Tip of a tulip stamen. Note the grains of pollen]]
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. The joining of the sperm to the ovules is called fertilization. Normally pollen is moved from one plant to another, but many plants are able to self pollinate. The fertilized ovules produce seeds that are the next generation. Sexual reproduction produces genetically unique offspring, allowing for [[adaptation]]. Flowers have specific designs which encourages the transfer of pollen from one plant to another of the same species. Many plants are dependent upon external factors for pollination, including: wind and animals, and especially [[insect]]s. Even large animals such as birds, bats, and [[pygmy possum]]s can be employed. The period of time during which this process can take place (the flower is fully expanded and functional) is called ''anthesis''.
== Fertilization and dispersal ==
[[ගොනුව:Cassia.jpg|thumb|[[Cassia Fistula]]. A hermaphrodite flower showing both male and female parts.]]
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, such as many [[dandelion]]s. Conversely, many species of plants have ways of preventing self-fertilization. Unisexual male and female flowers on the same plant may not appear or mature at the same time, or pollen from the same plant may be incapable of fertilizing its ovules. The latter flower types, which have chemical barriers to their own pollen, are referred to as self-sterile or self-incompatible (see also: [[Plant sexuality]]).