Plant Growth Regulators- Science Project


Plant Growth Regulators

The plant growth regulators (PGR) are small and simple molecules but have diverse chemical compositions. They are also called plant hormones or phytohormones. Plant Growth Regulators are divided into two major groups – plant growth promoters, e.g., auxins, gibberellins and cytokinins and plant growth inhibitors, e.g., abscisic acid. Let us do a simple experiment to understand how to regulate the growth of plants.


  • First, plant some ten seeds in each pot and each pot comprises all factors such as water, sunlight, and water but in different propositions. Label each pot so that it is convenient for identification.
  • Now just place the pots where there is a high amount of sunlight near the window and the rest pots with a low amount of light to the nearest to the window.
  • Now pots with a high amount of water should be at 9, and with a low amount of water, it should be at 2. Water accordingly.
  • Once the plants start to grow, note down some of the essential elements such as how tall they have grown, their colour, how many leaves are present at each stalk, the day they sprouted and how healthy it appears.
  • After one month of time span, judge each plant based on the essential elements that are mentioned above.


The plants that grew with a high amount of sunlight were healthier with slow growth. The plants with less amount of sunlight grew faster but they were not strong.


  • The project was conducted to test which growth regulators were important for plant growth. Sunlight, Water or Soil.
  • Based on the experiment, plants that grow with sunlight are much stronger and greener. Without them, they are skinny, white and weak.

Learn more about Plant Hormones, Coordination in Plants, Classifications of Plants, Tissues, and cells present in plants and behavioural changes in plants according to climatic conditions. Download BYJU’S – The Learning App to watch exciting video lectures on all the important topics of science.