The assertion is correct, and the reasoning provided is  incorrect.

The gynoecium is not the male reproductive part in flowering plants; rather, it represents the female reproductive part. The gynoecium is composed of one or more pistils, which are the female reproductive organs of a flower. Each pistil typically consists of three main parts: the stigma, the style, and the ovary.

The stigma is the receptive surface at the top of the pistil where pollen grains land and germinate. The style is a slender tube that connects the stigma to the ovary. The ovary is the enlarged basal part of the pistil that contains ovules, which are structures that develop into seeds after fertilization.

In summary, the gynoecium comprises the pistil(s), which are the female reproductive organs in flowering plants, and it is involved in the production of ovules and seeds, not the male reproductive function.