To attract animal/insects to them.
In most flowers, the petals contain the majority of fragrance, as evidenced by the use of rose and jasmine petals in the distillation of perfume oils.
If you were to walk through the forest and find a plant that has flowers with three petals, leaves and parallel veins, it is most likely a monocot.
A calla lily is an example of a one-petaled flower.
There are two major plant adaptations that flowers employ to assist in pollination. The color of petals and bracts are attractive to the necessary insects and the smell helps attract the insects that will ferry the pollen to the next flower.
The flowers with most petals are currently artificially selected flowers; that is, wild forms of, say, roses which have been cultivated into mutated forms with much more petals than would occur in nature. Wild flowers mostly have only one ring of petals, up to a total of either five or six in non-composite flowers, while cultivated flowers have many times that number.
To attract bees, because they're not colorblind :)
In most plants, this would be the flower; specifically, the petals.
petals
The scent that is most attractive to humans is that which comes from flowers.
Flowers aren't colored, they have PETALS that are colored. The flowers spend most of their energy making colorful petals mostly to attract pollinators (bees, butterflies, etc...), but after they are pollinated, they lose their petals because they should spend their energy of developing a seed rather than making petals, and also because they don't want pollinators to be attracted to them now that they are pollinated and make them pollinate other flowers instead.
Colourful petals. Plants that are not insect-pollinated are most often inconspicuous such as grass (which does have flowers!) or pines (which don't really have flowers but to produce massive amounts of pollen in spring, just because the wind is so random).
Most flowers are beautiful. They appear this way in order to attract bugs. When a bug lands on a flower's petals, the flower's pollen will get stuck on the bug's body. When the bug lands on a different flower, the pollen is transferred to the new flower.
Although a flower can come in all shapes, sizes, colors, and fragrances, most flowers are made up of the same parts that genetically mark them as a flower species. A flower will have petals, a pistil, a stamen, and a sepal.
In most flowers, the petals contain the majority of fragrance, as evidenced by the use of rose and jasmine petals in the distillation of perfume oils.
One of the most important reasons for flowers is to attract bees and insects for pollination.So the flowers are bright Nd attractive by nature.
The yellowbell or Allamanda, is a considered a hearty dessert bush. The petals pertains 5 sepals and a waxy white latex native to most genus.
Flowers are reproductive organs - they contain stamens (male parts of the flower, loaded with pollen) and stigmas (female parts of the flower, receptive to pollen from another plant of the same species). Plants cannot move, and so they rely on other creatures - normally insects - to move their pollen for them. The insects must be attracted to the flowers so that they will pollinate them. Most of the time, the flowers produce nectar to attract the insects. The bright petals are an advertisement, telling the insects that there is nectar or edible pollen available. Yellow flowers tend to attract insects, while red catches the eyes of most birds. The petals are coloured so brightly because of pigments that are relatively easy for the plant to produce. These pigments can be all colours and combinations of them make the flowers colourful.