Why would you usually find fruits and seeds on a plant after its flowers have withered away?

Flowers are precursors to fruit. Fruit contains seeds. To answer your question specifically, because the ovary within the flower became fertilized.

Why would you usually find fruits and seeds on a plant after its flowers have withered away?
because fruits n seeds are produced by fertilisation of ovary present inside flower. As soon as fertilisation takes place, petals of flowers wither away..
Reply:yes usually theflowers turn to seeds and fruits
Reply:The flowers attract the bees and other insects that pollinate them. Then the flowers turn into fruits and seeds which fall from the plant and hopefully will grow into a new plant.

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