Question

Bolting in some plants is induced by artificial treatment with which of the following plant hormones?
A. Ethylene
B. Auxin
C. Abscisic acid
D. Gibberellin

Answer 1

Hint: Bolting is a process that sometimes induces flowering stems in horticultural or agricultural crops before they are harvested. Under stress conditions, bolting occurs as an effort to grow seeds. Sometimes this is followed by plant hormones, also known as phytohormones.

Complete answer:
Bolting is also referred to under stressed conditions, as the survival mechanism of a plant. In this process, before harvesting the crop, the flowering stems are elongated for seed production. It helps to improve the plant's reproduction. Some of the examples of bolted crops include basil, spinach, onion, etc. By artificially treating crops with plant hormone gibberellins, the induction of bolting is carried out. This leads to tremendous elongation of internodes, thereby elongating the stems under normal circumstances in plants.
In simpler terms, it is a process in a plant for survival. It is the elongation of the flowering stem to grow seeds before the crop is harvested. Increased reproduction allows this. Usually, crops such as broccoli, basil, onion, etc are bolted. It is caused by the artificial treatment of gibberellin, a plant hormone. In normal conditions, it induces stem elongation in plants. Internodes elongate considerably prior to flowering, resulting in bolting.
So, the correct response is choice D, which is that the bolting is caused by artificial treatment with gibberellin plant hormones in certain plants.

Note: Various factors such as the dominance of high temperatures at specific stages of the plant growth cycle, the difference in the length of the day, and the incidence of stresses such as low availability of minerals and water frequently contribute to a plant being bolted. It happens only before a plant's flowering and reproduction. Naturally, it is caused by photoperiods and acceptable temperatures. Plant-hormone gibberellins can artificially cause bolting. These plant hormone gibberellins are naturally found in the plants but can also be exogenously produced. The height of intermodal regions present in the stem is increased by these gibberellins.