Which type of plants has seeds that grow within an ovum inside a flower?

The correct answer is flowering plants, also known as angiosperms. These plants have a unique reproductive structure wherein seeds develop within an ovule, which is situated inside a flower. The process begins with pollination, where pollen from the male part of the flower fertilizes the ovule in the female part. Following fertilization, the ovule develops into a seed, and often, the surrounding ovary matures into a fruit, which helps in seed dispersal.

In contrast, conifers, which are a type of gymnosperm, do not flower and produce seeds that are not enclosed in an ovary; instead, their seeds develop on the surface of cones. Ferns and mosses reproduce through spores rather than seeds. They lack the complex structures found in flowering plants and do not undergo the same fertilization process leading to seed formation. This distinction highlights the unique reproductive adaptations that characterize flowering plants among the plant kingdom.