Question

The habit of cabbage plant can be changed drastically by the application

of .................

• A. IAA
• B. $G{A}_3$
• C. Kinetin
• D. ABA

Answer 1

The correct option is B $G{A}_3$

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 floral stalk that occurs naturally in many plants, like cabbage, when they initiate flowering. These plants are biennials and show vegetative growth in first year and reproductive growth (flowering) in second year.