All papaya plants bear flowers but fruits are seen in some. Explain.

The papaya trees are all of the same species' Some trees bear bisexual flowers, both male and female parts are present. But the flowers of other trees are unisexual; they bear only either male or female part. So the trees that bear only male flowers cannot produce fruit.

Papaya plants can occur in three sexual forms; male, female and hermaphrodites. A fruit is formed when a fertilization occurs in the ovary of the female flower. So, if a female or a male plant is growing alone, it will produce flowers but it will not produce fruits as both male and female plant is required for fruit formation. Hermaphrodite papaya plants will always bear fruits as their flowers contain both male and female parts.