question_answer 37)

      The main function of abscise acid in plants is to (a) increase the length of cells                                   (b) promote cell division (c) inhibit growth                                                             (d) promote growth of stem

Answer:

                  (c) The main function of abscisic acid in plants in to inhibit growth. The other plant hormones with their functions are given in the table below

Phytohormone	Function
Auxins	Promote cell elongation, root formation, cell division and other physiological processes
Gibberellins	Stimulate stem elongation, stem germination and flowering (opposite effect of ABA)
Cytokinis	Promotes cytokinesis, also helps in breaking dormancy and regulating phloem transport.
Abscisic acid	Growth inhibitor, causes dormancy of seeds, etc. promotes leaf and fruit fall, helps in stomata closing to prevent loss of H2O.
Ethylene	Promotes transverse growth, senescence, abscission of leaves, etc.