Question

Gibberellin promotes cell division and elongation in

• A. Leaves
• B. Roots
• C. Shoots
• D. All of the above

Answer 1

The correct option is D All of the above

Gibberellins are a kind of growth promoting plant growth regulators (PGRs). There are more than 100 gibberellins reported from widely different organisms such as fungi and higher plants. They are denoted as GA${}_1$, GA${}_2$, GA${}_3$ and so on. However, gibberellic acid (GA${}_3$) was one of the first gibberellins to be discovered and remains the most intensively studied form. All gibberellic acids are acidic. They produce a wide range of physiological responses in the plants. Their ability to cause an increase in length of axis is used to increase the length of grapes stalks. Ability to increase length is the most important characteristic feature of gibberellins and gibberellins cause increase in length of all aerial parts. Gibberellins, cause fruits like apple to elongate and improve its shape. They also delay senescence.

Thus, the correct answer is option D.