After fertilisation, the zygote develops into an embryo, ovules change into seeds, and the ovary grows into a fruit. Meanwhile, petals and sepals usually wither. These transformations mark the development of fruit and seed.
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Post-fertilisation, the zygote formed in the ovule develops into an embryo. The ovules mature into seeds, while the ovary enlarges and transforms into a fruit, enclosing the seeds. Other floral parts like petals and sepals usually dry and fall off. This sequence of changes ensures seed protection, dispersal, and continuation of the plant species through fruit formation.