The flask-shaped organ in the centre of a flower is called carpel. It is also called as female reproductive organ of the plant. It is made up of three parts :
(i) Stigma is the top part of carpel and is sticky. So, it receives the pollen from the anther of stamen.
(ii) Style connects stigma to ovary and acts as the passage for the growth of pollen tube.
(iii) Ovary contains female gametes of the plant and helps in reproduction, it is the site of fertilization.