The plant growth regulators are small, simple molecules of diverse chemical composition. They are
[amp_mcq option1=”carbohydrates, fats and proteins” option2=”indole compounds, adenine derivatives, carotenoids and terpenes” option3=”fatty acids, glucose and vitamins” option4=”vitamin C, vitamin D and glucose” correct=”option2″]
This question was previously asked in
UPSC CDS-1 – 2017
Plant growth regulators are small, simple molecules including indole compounds, adenine derivatives, carotenoids and terpenes.
Plant growth regulators (PGRs), also known as phytohormones, are organic compounds other than nutrients which in small amounts promote, inhibit or otherwise modify any physiological process in plants. The main classes of PGRs include Auxins (indole compounds, e.g., IAA), Cytokinins (adenine derivatives, e.g., kinetin), Gibberellins (terpenes, e.g., GA3), Abscisic Acid (carotenoid derivatives/terpenes, e.g., ABA), and Ethylene (a gaseous hormone). These chemical classifications align with the options provided.