The activity of $\alpha$-amylase in the endosperm of barley germinating seed is induced by

Cell elongation in internodal regions of green plants takes place due to

The hormone that replaces the requirement of vernalization is

Select the correct option for $GA_3$.

Which hormone is responsible for breaking dormancy of peanut seeds and potato tubers?

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.