alleryThe **Richmond-Lang effect** describes the action of:
AAuxin in stem elongation
BCytokinins in delaying leaf senescence
CGibberellins in seed germination
DABA in dormancy
Answer & Solution
Correct answer: B. Cytokinins in delaying leaf senescence
Richmond & Lang (1957): applying kinetin (a cytokinin) to detached leaves DELAYS yellowing/senescence.
Cytokinins retain chlorophyll, protein and RNA in aging leaves.
Used in horticulture (cut flowers).
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