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The main function of the calyx is to protect the flower in its bud condition. The calyxes are usually green in colour but sometimes it may be coloured as petalloid, then it can attract insect and helps in pollination. In certain cases calyx develop spur and can store nectar or sometime it helps in seed dispersal too.

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The calyx is collective name for sepals. The sepals are usually green in colour to attract insects for pollination. They are the outermost parts(whorls) of flower.
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