The growth regulator that retards ageing of plant organ is

A. Abscisic acid

B. Auxin

C. Cytokinin

D. Gibberellin

Answer: Option C

Solution(By Examveda Team)

The growth regulator that retards ageing of plant organs is Cytokinin.
cytokinins are an important regulatory factor of plant meristem activity and morphogenesis, with opposing roles in shoots and roots.
It promotes cell division and increases cell expansion during the proliferation and expansion stages of leaf cell development, respectively.