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A flower is made up of the calyx, corolla, androecium, and gynoecium. The calyx and corolla are non-essential components of the flower. Androecium and gynoecium are the two most important parts of the flower. Androecium and gynoecium are the male and female reproductive parts of the plant, respectively.

• The androecium is made up of stamens. Each stamen contains an anther and a filament. The pollen grains are produced inside the anther.
• The gynoecium comprises the carpel. The carpel is made up of a stigma, style, and ovary.

• The slender stalk of the carpel is the style. It connects the stigma to the ovary. The pollen tubes reach the ovary via the style. The style acts as a pollen contamination buffer as only the right pollen can form a pollen tube.
• The ovule is where the female egg cell is developed and stored and is located inside the ovary.

• Integuments are protective covering of cells that surrounds the ovule.

Stigma is the uppermost part of the carpel that receives the pollen grains during pollination.