Shelf life of vegetables and cut flowers can be increased by commercial application of

Study the following statements:
$I.$ Cytokinins are formed primarily in roots.
$II.$ Auxin and cytokinin are antagonistic in apical dominance.
$III.$ Kinetin (a modified $DNA$ purine) was discovered from herring sperm.
$IV.$ Zeatin is auxin.
$V.$ Zeatin was firstly extracted from herring.
Choose the incorrect one.

Which of the following induces flowering in short day plants?

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

What are the primary functions of cytokinins in plants?

Which hormone is concerned chiefly with cell division in plants?