In plants,which hormone induces $RNA$ synthesis?

Which of the following growth regulators is an adenine derivative?

Which of the following is a kinetin derivative?

Which one of the following is $NOT$ a function of cytokinins?

Farmers in a particular region were concerned that premature yellowing of leaves of a pulse crop might cause a decrease in the yield. Which treatment could be most beneficial to obtain maximum seed yield?

Which of the following plant hormones is responsible for delaying the senescence of plant organs?