Question

Both autogamy and geitonogamy cannot occur in

Answer 1

Autogamy
In autogamy, the pollen grains are transferred from the anther to the stigma of the same flower in a plant. These plants do not require pollinators and occurs only in bisexual flowers that possess both male and female reproductive parts.
Geitonogamy
In geitonogamy, the pollen grains are transferred from the anther to the stigma of a neighbouring flower of the same plant.
Papaya
Papaya is a dioecious plant with male and female flowers on different plants. It cannot reproduce by autogamy as the flowers on the papaya plant are unisexual.
Geitonogamy is not possible in papaya plant because the male and female flowers are borne on separate plants and hence pollen cannot be transferred from the anther of a male flower to the stigma of a female flower on the same plant.
Cucumber, castor and maize
Cucumber, castor and maize are monoecious plants. Male and female flowers are produced on a single plant and hence geitonogamy is possible in such plants.
Final answer
(A) Papaya