The only promoter of leaf senescence in the following plant hormones is________________?
Correct answer: D. Abscisic Acid
- A. Gibberellins
- B. Cytokinins
- C. Auxins
- D. Abscisic Acid
Explanation
Abscisic acid promotes leaf senescence and helps the plant enter stress-related resting states, while cytokinins generally delay senescence by maintaining chlorophyll and cellular activity. Auxins and gibberellins also have other growth effects rather than being the standard hormone identified as promoting senescence. The likely alternative is cytokinins because they strongly affect leaves, but their usual effect is to delay, not promote, senescence.
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