What develops into a fruit around the seed after fertilisation?

The ovary is the part of the flower that develops into a fruit after fertilization occurs. When a pollen grain fertilizes an ovule in the ovary, it triggers the ovary's transformation. The ovary wall thickens and matures to form the fruit, which serves to protect the developing seeds and aid in their dispersal once mature. This process is essential for the reproductive cycle of flowering plants.

The ovule, while crucial in the process of fertilization, specifically becomes the seed itself, not the fruit. The stigma and style are parts of the female reproductive structure in a flower but do not contribute directly to the formation of the fruit after fertilization. The stigma is the part that receives the pollen, and the style is the structure that connects the stigma to the ovary. Together, they facilitate the fertilization process, but it is the ovary that ultimately develops into the fruit surrounding the seeds.