Q.Write any two post fertilizational changes.

Fertilization triggers the ovule to mature into the seed and the ovary to mature into the fruit, while most other floral parts wither away.

Once syngamy and triple fusion (double fertilization) have occurred, a series of changes convert the flower's structures into the mature fruit and seed:

1. Ovule -> Seed: the zygote (from syngamy) divides repeatedly to form the embryo; the primary endosperm nucleus (from triple fusion) develops into the nutritive endosperm tissue; the integuments of the ovule harden and thicken to form the protective seed coat (testa and tegmen).

2. Ovary -> Fruit: the ovary wall enlarges and matures into the pericarp (fruit wall), which may become fleshy (as in a berry) or dry (as in a pod or capsule), enclosing and protecting the developing seed(s).

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