Anthocyanin and carotinoids are main component that makes flower colourful.
Responsible plastid so called chloroplast causes flower as different colour. Another plastid chlorophyll causes green colour of leaf, tendon and immature fruits.
Chromoplast can turn into chloroplast. For example, green fruits turning into coloured fruit.
Flower pigmentation occurs due to necessity of pollination. For pollination there required insects to come. Insects are the primary carrier of pollen grain.
Flower become colourful to attract insects.
Anthocyanin is responsible to develop petals as pink, red, blue, orange colour.
Flower shapes their colour through a long journey .
Each colour attract each types of pollinator. Bee attracted by bright colour. Hurming bird attracted by red and orange colour.
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