Most plants have brightly coloured petals and are often strongly scented for the purpose of attracting insects for pollination. Pollination helps in reproduction. Flowers blooming at night such as moonflower have less showy petals, but are strongly scented.
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Iba Arshie answered this
Flowers are a beautiful addition to gardens,creating spots of color and producing scents that float on the breeze.Some gardeners choose flowers based on their colors and frangrances,inadvertently attracting other garden visitors when planted en masse.The bright colors and pleasent aromas of these plants are easy for potential pollinators to detect from far afield.