(1). ABA catabolism is mediated by a.       ABA-8’ carboxylase b.      ABA-8’ hydroxylase c.       ABA-8’ aminotransferase d.      ABA-8’ oxygenase (2). Nodulating genes in Rhizobium are influenced by the presence of which one of the following in the roots? a.       Flavones b.      Lignin c.       Tannins d.      Cellulose (3). Which of the following […]