Which among the following is an example for unisexual flower?
A. Datura
B. Hibiscus
C. Rose
D. Papaya

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Hint: Plants are a very important part of life on earth. They provide us food, shelter, medicine and oxygen to breathe. Some basic parts of the plant are: Root, stem, leaves, fruits, flowers and seeds.

Complete answer:
Flower: A flower is the reproductive structure found in flowering plants also known as angiosperms. They help in reproduction by providing a method for the union of sperms with eggs. Flowers may facilitate our crossing.
Outcrossing means fusion of sperm and eggs of different individuals which results from cross pollination or when self pollination occurs.

Pollination is mainly of two types:
1. Self-pollination
2. Cross-pollination.

> Self pollination means when the pollen from the anther is dropped on the stigma of the same flower or can be on another flower on the same plant.

> Cross pollination means transfer of pollen from the anther of one flower to the stigma of another flower on a different individual of the same species.

Unisexual flowers: Flowers which contain only the male or female reproductive organs.
They reproduce by undergoing cross-pollination.
Examples: Papaya, White mulberry and Watermelon. Bisexual flowers: The flowers which contain both male and female reproductive organs in one flower.
They reproduce by undergoing self pollination.
Hibiscus, Rose, and Datura have bisexual flowers because it consists of both stamens and carpel.
Papaya has unisexual flowers, male flowers, and female flowers are on separate plants.

Hence, The correct answer is option (D).

Note: Inflorescence: Species that have more than one flower on an axis is termed an Inflorescence. They may include specialized stems and modified leaves known as bracts.
For example: A single daisy or sunflower.