A hormone that prevents senescence in leaves, is:
Correct answer: C. Cytokinin
- A. Auxin
- B. Gibberellins
- C. Cytokinin
- D. Abscisic acid
Explanation
Leaf senescence is a degenerative process among which cellular organelles and biomolecules are broken down and resultant catabolites are mobilized to sink tissues such as reproductive organs and new leaves. Cytokinins help to maintain the plant cells and expression of cytokinin biosynthesis genes late in development prevents leaf senescence. Hence the answer is C.
This question appeared on the ETEA MDCAT 2013 paper, which you can sit online with every answer explained.
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About Plant Growth Regulators
Plant growth regulators are chemical messengers that control growth, development and responses to the environment. The topic covers auxins, gibberellins, cytokinins, abscisic acid and ethylene, including cell elongation, apical dominance, tropisms, seed germination, dormancy, fruit ripening and leaf fall, with growth promoters distinguished from inhibitors.
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