To make stored food available for germination,with which hormone should a seed be treated?

Specific property attributed to gibberellins is

Gibberellins were first discovered in Japan when rice plants were suffering from bakane (the foolish seedling disease) caused by a fungus $Gibberella$ $fujikuroi$.
$(a)$ Give two functions of this phytohormone.
$(b)$ Which property of Gibberellin caused foolish seedling disease in rice?

The habit of a cabbage or acaulescent (stemless) plant can be changed drastically by the application of:

Dwarfness can be controlled by treating the plant with

Gibberellin was first extracted from