Flowers are the way a flowering plant reproduces sexually. Male pollen grains join with the female ovule to make a new seed. The ovary develops into the fruit and serves to spread the seeds around when mature. Pollen, the male 'cells' are made by the STAMENS (or more correctly the ANTHERs of the stamens) However the pollen needs to be carried to the female STIGMA so that fertilization can take place - the joining of a pollen grain and an egg cell(OVULE). this movement of pollen from the anther to the stigma is called POLLINATION. Some plants are winds pollinated and so don’t need to have brightly coloured petals. Their flowers are drab. But other flowers need something to carry the pollen to the female stigma such as bees and other insects. To encourage bees to visit the flowers the petals are brightly coloured and have honey guides or lines in them guiding the bee to the NECTARIES. so the bees come to the flower to collect pollen and nectar and accidentally transfer pollen from one flower to the other. the sepals are usually green and serve to protect the develping flower bud. In some plants though such as the fuchsia, the sepals are brighly coloursed and help in attracting insects.