Spraying sugarcane with gibberellin increases the yield by as much as 20 tonnes per acre. GA performs it by(a) Improving quality of fruit(b) Increasing sugar content(c) Internodal elongation(d) Delaying senescence

Hint: Gibberellins are plant growth hormones which enhance the longitudinal growth of stem when applied to intact plants. They do not enhance the growth of isolated plant parts. The presence of meristematic cells is necessary for gibberellin induced growth in length. Gibberellins cause the extraordinary elongation of stems and leaf sheath in intact plants. Studies have shown that external supply of GA to dwarf plants causes rapid elongation.Complete step by step answer: Elongation of stem helps in Internodal elongation which increases the yield of sugarcane. The elongation of the stem is due to cell division and cell elongation, induced by gibberellic acid. One of the most striking effects of gibberellin is the reversal of dwarfism in many genetically dwarf plants. Rosette plants of sugar beet, when treated with gibberellins, undergo marked longitudinal axial growth. Extensive studies indicated that the dwarf plants have very low GA level which appears to account for the dwarf habit. T...