Papaya-(carica papaya) is a unisexual flower both male and female produces fruits

Unisexual flowers are flowers that have either male or female reproductive structures, but not both. In other words, the male and female flowers are found on separate plants. Among the given options, the plant with unisexual flowers is the Papaya plant (option C).

Papaya (Carica papaya):
Papaya is a tropical fruit-bearing plant that belongs to the Caricaceae family. It is a dioecious plant, meaning it has separate male and female plants. The male plants produce only male flowers, while the female plants produce only female flowers.

Explanation of the other options:

a) Hibiscus:
Hibiscus is a flowering plant that belongs to the Malvaceae family. It has perfect or bisexual flowers, which means the flowers contain both male and female reproductive structures. Therefore, hibiscus does not have unisexual flowers.

b) Mustard:
Mustard is a plant that belongs to the Brassicaceae family. It also has perfect or bisexual flowers with both male and female reproductive structures. Therefore, mustard does not have unisexual flowers.

d) Pansy:
Pansy is a small, colorful flower that belongs to the Violaceae family. Similar to hibiscus and mustard, pansy also has perfect or bisexual flowers. The flowers contain both male and female reproductive structures. Therefore, pansy does not have unisexual flowers.

In summary, the Papaya plant (Carica papaya) is the correct answer as it has separate male and female plants that produce unisexual flowers. The other options, including hibiscus, mustard, and pansy, have perfect or bisexual flowers containing both male and female reproductive structures.