Which part of a plant protects and ensures the survival of fertilized eggs

The female reproductive ovule is fertilized by the pollen and ovule resides in the ovary. So the ovary protects and ensures the survival of fertilized eggs.

Female flowering part consists of stigma which ends up in the style leading to the ovary. Male reproductive part consists of filament which holds the anthers that produce pollen. Fertilisation in flowering plants takes place inside the ovary of the flower which encloses the ovules. The fertilised ovule develops into a seed and ovary forms the fruit. Seed contains and stores the food and the embryo for forming a new plant.

The fertilized egg or embryo is protected from harsh environment and predations in an internal fertilisation.