why do most of the flowers have bright colours and have fragrances

to attract insects as they have to get the pollination done and colourful flowers attract insects to suck nectar from them.
 

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to attract insects for honey
 
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yu
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To attract insects for pollination
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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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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.
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