A) ABA
B) CKN
C) GA
D) \[{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{4}}}\]
Correct Answer: B
Solution :
Cytokinins are aminopurine derivatives. The first cytokinin was discovered by Miller et. ai, from sperm DNA. Richmond-Lang effect is due to activity of cytokinin i.e., application of cytokinins delay the senescence or ageing of leaves because cytokinin inhibit lose of chlorophyll and degradation of protein. So, cytokinin are called antiageing hormones. \[{{C}_{2}}{{H}_{4}}\](ethylene) is a gaseous plant hormone, which stimulates ripening of fruit. ABA or abscisic acid is a inhibitor hormone which induces dormancy and helps to overcome conditions of stress. ABA promotes ageing in leaves. GA or Gibberellin is a plant hormone responsible for growth of stems and leaves and germination of seeds.
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