The egg cell of a plant is located within the ovule, which is found inside the ovary of a flower.

Here's a breakdown:

* Flower: The reproductive structure of a flowering plant.

* Ovary: The swollen base of the pistil, where the ovules are located.

* Ovule: A structure within the ovary that contains the egg cell (female gamete).

* Egg cell: The female gamete, which is responsible for fertilization.

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