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

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

Select the correct option for $GA_3$.

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?

Many discoveries in science have been accidental. This is true for plant hormones also. Can you justify this statement by giving an example? Also,what term is used for such accidental findings?

Gibberellins cause: