Induction of more staminate flowers in cucurbits is seen under

Answer: Option B

Induction of more staminate flowers in cucurbits is seen under Long day conditions.
Cucurbits have distinct, separate male and female flowers. This is a female flower and you can see the fruit right underneath it and over here is a simple male flower.
The sterility is non-genetic, non-heritable, and induced with the help of chemicals that make the male part abortive, known as chemical-induced male sterility.
Ethylene is the main factor of flower sex differentiation in the buds of the Cucurbitaceae family, which induces the femaleness of flowers. Induction of male flowering in gynoecious cucumbers by silver ions especially in long-day conditions.