Question

The term synergistic action of hormones refers to

• A. when two hormones act together but bring about opposite effects
• B. when two hormones act together and contribute to the same function
• C. when one hormone affects more than one function
• D. when many hormones bring about any one function

Answer 1

Answer: (B)

Growth, differentiation and development processes of plants are found to be regulated by two or more phytohormones acting synergistically or antagonistically, e.g. cell division is promoted by both auxins and cytokinins acting synergetically. Cell growth is controlled by auxins, gibberellins and cytokinins. Morphogenesis is an interplay of auxins and cytokinins, where both must be present in some minimum concentration.