This is not a function of gibberellins

The correct option is "promote dormancy".

Gibberellins are a group of plant hormones (phytohormones) that play an essential role in regulating various developmental processes. Instead of promoting dormancy, gibberellins are well-known for breaking seed and bud dormancy to initiate germination and growth.

Here is a step-by-step breakdown of why the options align with the functions of gibberellins, and why promoting dormancy is not one of them:

1. Breaking Dormancy vs. Promoting Dormancy:
Gibberellins stimulate the synthesis of hydrolytic enzymes (such as amylase) in seeds, which break down stored food reserves and support embryo growth, thereby ending seed dormancy. The hormone responsible for promoting dormancy is actually abscisic acid (ABA), which acts antagonistically to gibberellins.

2. Promote Cell Elongation and Elongation of Internodes:
Gibberellins actively promote the elongation of cells and internodes, leading to an overall increase in the height of the plant. This is particularly evident in genetic dwarf plants, where application of gibberellins causes rapid stem elongation (bolting).

3. Promote Parthenocarpic Fruit Formation:
Gibberellins are also known to induce parthenocarpy, which is the development of seedless fruits without fertilization (for example, in grapes, apples, and tomatoes).

Therefore, among the choices provided, "promote dormancy" is the only activity that is not a function of gibberellins.