The 'Bakane' (foolish seedling) disease of rice seedlings was caused by:

Name the plant growth regulator which,upon spraying on sugarcane crop,increases the length of stem,thus increasing the yield of sugarcane crop.

Dormancy of seed is broken by

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.

Gibberellins can promote seed germination because of their influence on

The process of increasing the length of internodes prior to flowering is called $........$.