Which of the following plants produce unisexual flowers?

Correct option is B

Unisexual flowers are those that have either male or female reproductive organs, but not both.

• Watermelon: Watermelon plants have unisexual flowers. The male and female flowers are separate, with the male flowers producing pollen and the female flowers having the ovary that develops into the fruit after fertilization.
•  Papaya: Papaya plants also produce unisexual flowers. Some papaya plants have only male flowers, some have only female flowers, and some have both (hermaphroditic). The male flowers produce pollen, while the female flowers have ovaries that can develop into fruits.

• Mustard has bisexual flowers (flowers that contain both male and female reproductive parts).
• Hibiscus also has bisexual flowers.

 Hibiscus and Papaya:

• Hibiscus, like mustard, has bisexual flowers, so it doesn't produce unisexual flowers.

Watermelon and Mustard:

• While watermelon produces unisexual flowers, mustard has bisexual flowers, which means both male and female parts are present in the same flower.