Assertion (A) : A hormone called abscisic acid inhibits growth in plants.\ Reason (R) : The role of

Question

Assertion (A) : A hormone called abscisic acid inhibits growth in plants.\ Reason (R) : The role of auxins is opposite to that of abscisic acid in plants.\

Professor PC Thomas Classes · Answer

(b) : Plant hormones or phytohormones are organic substances that regulate plant growth and development. Hormones like auxin, gibberellins and cytokinins help in promoting growth while abscisic acid ( ABA ) is the only hormone which inhibits the growth and induces wilting of leaves. So, auxin may somehow has the opposite role of ABA but its not the correct reason for it as auxin is an antagonist of cytokinin. Cytokinin promotes shoot and inhibits root growth, whereas auxin does the opposite.