Parts of a Flower in Angiosperms

A Flower is a composite system of modified leaves and knots, which directly participates in the reproductive activity and produces fruits and seeds. Usually a flower is composed from four modified leaves which are attached to the thickened receptacle thalamus. This receptacle thalamus has four types of cycle- calyx, corolla, androecium and gynoecium.

The flower which has all four cycles is called complete flower, while if any cycle be absent then it is called incomplete flower. The organelles calyx and corolla and called auxiliary organelles, while androecium and gynoecium and called necessary organelles.

Calyx

This is an extremely outer cycle of the flower and it is green coloured cycle of sepals. The main work of calyx is to protect the soft parts of buds and performs photosynthesis. In some flowers, it becomes coloured and its main function to attract insects for the pollination.

Corolla

This is the second cycle of the flower which is confined inside the organelle calyx.  Corolla is mainly composed from 2-6 petals and it is also colored  whose  main function  to fascinate insects for the pollination.

Androecium

This is the third cycle of sepals which is the made from stamens. The stamen is the male sex organ of the flower. Each and every stamen has its three parts viz. Filament, Anther and Connective. The vital component of androecium is basically stamen and in which pollen grains are found in pollen sac.

Gynoecium

This is the central part (fourth cycle) of the flower and it is the female sex organ  of the flower. Each and every gynoecium is made from one or more carpels and it produces female ovule. The carpel is made from three components- ovary, style and stigma.