Flower is complete when it has

calyx, corolla, androecium and gynoecium

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calyx and corolla

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androecium and gynoecium

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corolla, androecium and gynoecium

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Solution

The correct option is A calyx, corolla, androecium and gynoecium
The flower may be described as complete if it bears all the floral whorls or floral parts such as calyx, corolla, androecium and gynoecium. Example: Rose, Hibiscus.

Complete flower with all four whorls

The flower becomes incomplete if any one of the whorl is absent. Example: Begonia, gourds, sweet corn.

Incomplete flower with
androecium/stamens absent

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