Study the following statements.
I. “X” hormone promotes root growth and root hair formation thus helping the plants to increase their absorption surface.
II. “Y” hormone induces flowering in mango and also promotes rapid internode/petiole elongation in deep plants and hence helping leaves or upper parts of shoot above water.
III. “Z” hormone inhibits the seed germination, increase the tolerance of plant to various stresses, play import in seed development, maturation and dormancy.
Identify the correct names of hormones marked as ‘X’, ‘Y’ & ‘Z’.
(a) Y = ABA; X = Auxin; Z = GA
(b) Z = GA; X = Auxin; Y = C2H4
(c) Y = Auxin; X = C2H4 ; Z = GA
(d) Y = C2H4 ; X = C2H4 ; Z = ABA
(d) Y = C2H4 ; X = C2H4 ; Z = ABA
Explanation:
Gibberellins stimulate the production of some mRNAs and then hydrolytic enzymes like amylase, lipase ribonuclease and proteases. The enzymes solubilise the reserve food of the seeds and the same is transferred to embryo axis for its growth.