Bisexual flowers, also known as hermaphroditic flowers, have both the androecium and gynoecium, which are the male and female reproductive parts of a flower, respectively. These flowers possess both male and female reproductive organs, allowing them to produce both male and female gametes.

Explanation:
1. Bisexual flowers: Bisexual flowers, as the name suggests, have both male and female reproductive structures within a single flower. This means that they have both the androecium and gynoecium, which are responsible for producing pollen and ovules, respectively.

2. Androecium: The androecium is the male reproductive part of a flower. It consists of one or more stamens, which are composed of anthers and filaments. The anthers produce pollen, which contains the male gametes.

3. Gynoecium: The gynoecium is the female reproductive part of a flower. It consists of one or more carpels, which are composed of the stigma, style, and ovary. The stigma is the receptive surface for pollen, while the style connects the stigma to the ovary. The ovary contains ovules, which contain the female gametes.

4. Flowers with both androecium and gynoecium: Bisexual flowers have both the male and female reproductive structures within a single flower. This allows them to produce both male and female gametes, which are necessary for sexual reproduction.

5. Importance of bisexual flowers: Bisexual flowers are advantageous for plants because they allow for self-fertilization. Self-fertilization occurs when the pollen from the anthers of a flower reaches the stigma of the same flower or another flower on the same plant. This ensures that the plant can reproduce even in the absence of other compatible plants for cross-pollination.

In conclusion, flowers with both androecium and gynoecium are called bisexual flowers or hermaphroditic flowers. These flowers possess both male and female reproductive structures, allowing them to produce both male and female gametes for sexual reproduction. Bisexual flowers are advantageous for plants as they enable self-fertilization and ensure reproductive success even in the absence of other compatible plants.

Bisexual flowers