stigma - It plays a pivotal role in reproduction where the pollen lands.
Stigma is an extension of the female gametophyte, when the stigma is mature it produces a sticky substance which allows a good environment for pollen grains to adhere and interact with the stigma. When the pollen grain adheres to the stigma, the sticky substance is made of energy and provides a pH for the pollen grain to react, this pH will allow the pollen grain to release certain enzymes which will direct the pollen grain to the ova and the sperm in the pollen grain meets with ova and fuse to form a zygote, this zygote form a fruit and the seed.