Which of the following hormones can replace vernalization?

All $GAs$ are .............

Gibberellins promote the formation of $.......$ flowers on genetically $.......$ plants in $Cannabis$,whereas ethylene promotes the formation of $.......$ flowers on genetically $.......$ plants.

$E$. Kurosawa discovered:

The size of grape fruits is enlarged by using which of the following plant growth hormones?

Foolish seedling disease of rice led to the discovery of