Flowers which contain only one sex organ either stamen or carpels are called unisexual flowers.and the flowers which contain both the sex organ stamen as well as carpel are called bisexual flowers.....

Bisexual Flower:
A bisexual flower, also known as a hermaphrodite flower, is a type of flower that possesses both male and female reproductive structures within a single flower. These flowers have the ability to produce both male and female gametes, allowing them to self-pollinate or cross-pollinate with other flowers. The presence of both male and female reproductive organs in the same flower offers several advantages for plant reproduction.

Structure of a Bisexual Flower:
A bisexual flower typically consists of the following structures:
1. Stamen: This is the male reproductive structure of the flower, consisting of the filament and anther. The anther produces pollen grains, which contain the male gametes.
2. Carpel: This is the female reproductive structure of the flower, consisting of the stigma, style, and ovary. The stigma is the receptive surface for pollen, the style connects the stigma to the ovary, and the ovary contains the ovules, which house the female gametes.

Advantages of Bisexual Flowers:
1. Self-Pollination: Bisexual flowers have the ability to self-pollinate, as the male and female reproductive organs are present within the same flower. This ensures successful fertilization even in the absence of other flowers.
2. Cross-Pollination: Bisexual flowers can also cross-pollinate with other flowers, increasing genetic diversity and promoting healthier offspring.
3. Efficient Reproduction: By having both male and female reproductive organs, bisexual flowers can efficiently reproduce without relying solely on external factors such as wind or pollinators.

Unisexual Flower:
In contrast to bisexual flowers, unisexual flowers are flowers that possess either male or female reproductive structures, but not both, within a single flower. These flowers are either male (staminate) or female (pistillate), and require the presence of other flowers of the opposite sex for successful reproduction.

Types of Unisexual Flowers:
1. Staminate Flowers: Staminate flowers are male flowers that only possess male reproductive structures, such as stamens and anthers. They produce pollen but lack the female reproductive organs required for fertilization.
2. Pistillate Flowers: Pistillate flowers are female flowers that only possess female reproductive structures, such as pistils and ovaries. They have the ability to produce ovules, but lack the male reproductive organs required for pollination.

Importance of Unisexual Flowers:
Unisexual flowers play a crucial role in plant reproduction by promoting cross-pollination. They rely on external factors, such as wind or pollinators, to transfer pollen between male and female flowers. This allows for genetic diversity and the production of healthy offspring. Unisexual flowers are commonly found in plant species that have evolved specific mechanisms to attract pollinators or facilitate wind dispersal of pollen. These flowers have a specialized reproductive strategy that maximizes the chances of successful fertilization and ensures the survival of the plant species.