Question

A single pea plant in your kitchen garden produces pods with viable seeds, but the individual papaya plant does not. Explain. [2]

Answer 1

In pea plant both male and female flowers (monoecious) are present on the same plant and are bisexual, which results in producing viable seeds after self pollination. [1]

In papaya plant, male and female flowers are present on different plants (dioecious) and plants are unisexual.
There is no pollinatoion to produce viable seeds.
As it can be just a male or just a female plant and unable to produce fruits.[1]