Final answer:
The stigma, style, ovary, and ovules form the female reproductive parts of a flower, collectively called the gynoecium or pistil. The stigma captures pollen, the style serves as a passage to the ovary, which contains the ovules that develop into seeds after fertilization.
Step-by-step explanation:
The four parts of a flower, specifically the stigma, style, ovary, and ovules, are components of the flower's female reproductive structure, known as the gynoecium or pistil. The stigma is the part of the pistil where pollen is deposited, often characterized by a sticky surface that captures pollen grains. Below the stigma is the style, which is a slender passage that leads to the ovary. The ovary is located at the base of the pistil and houses the ovules. After pollination, the ovules are fertilized and eventually develop into seeds.
The process of sexual reproduction in flowers involves the transfer of pollen from the male structures, or androecium, to the stigma of the female structures, or gynoecium. A typical flower is structured into four whorls: the calyx (sepals), corolla (petals), androecium (male reproductive organs), and gynoecium (female reproductive organs).