In plant biology, what phenomenon causes deciduous plants to drop their leaves in response to seasonal cues or stress?
Answer and explanation
Correct answer: A. abscission
- Step 1: Abscission is the shedding of leaves, flowers, or fruit, regulated by changes in auxin and ethylene at the abscission zone. Answer: abscission. Why not the others: Vernalization is cold-induced flowering; etiolation is growth in darkness.
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