Texas Pesticide Applicator Practice Exam

What type of chemicals are known as growth regulators?

1. Herbicides

2. Pesticides

3. Fungicides

4. Plant alteration substances

The correct answer is: Plant alteration substances

Growth regulators, also referred to as plant growth regulators, are substances that influence the growth and development processes in plants. These chemicals work by altering physiological functions, thus modifying or controlling various aspects like growth rate, flowering, fruiting, and overall plant development. The option that describes growth regulators as plant alteration substances captures their primary role in manipulating the growth characteristics of plants. Unlike herbicides, pesticides, or fungicides—each designed for controlling weeds, pests, or fungal infections, respectively—growth regulators specifically aim to modify plant behavior rather than eliminate unwanted organisms. This is why the term 'plant alteration substances' is accurate and fitting for growth regulators. Their distinct purpose sets them apart from other categories of agricultural chemicals focused on pest control or disease management.