The enzyme that induces seed germination in barley seeds is . . . . . . .

Which of the following are effects of gibberellins?
$(a)$ It helps overcome apical dominance.
$(b)$ It delays senescence,thus fruits can be left on the tree longer.
$(c)$ Increase in length of axis.
$(d)$ It is used to speed up the malting process in brewing industries.
$(e)$ It induces parthenocarpy.
$(f)$ Promotes female flowers in cucumbers.

Which of the following plant hormones can substitute for long photoperiods in flowering plants?

Give scientific reasons: Rice plants infected by the fungus $Gibberella$ $fujikuroi$ grow foolishly tall.

The 'foolish seedling' disease of rice led to the discovery of which plant growth regulator?

Gibberellin is obtained from a