Question

Bolting hormone is ...............................

• A. Auxin
• B. Gibberellin
• C. ABA
• D. Ethylene

Answer 1

The correct option is B Gibberellin

Gibberellins are growth promoting phytohormones. Gibberellins promote stem elongation in many plants. When gibberellin is applied to a plant, particularly certain dwarf varieties, this elongation may be spectacular. Some corn and pea plants that are dwarfs as a result of one or more mutations grow to a normal height when treated with gibberellin. Short-stemmed, high-yielding varieties of wheat have short stems because they have a reduced response to gibberellin. These varieties put less of their resources into stem height and more resources into grain production. Gibberellins are also involved in bolting, the rapid elongation of a (leafless) floral stalk that occurs naturally in many plants when they initiate flowering, example cabbage.