abscission

definition: 
The natural detachment of parts of a plant, typically dead leaves and ripe fruit.
sentence: 
The presence and balance of plant hormones have been shown to affect abscission of leaves, flowers, and immature and mature fruit.
Ethylene is involved in many biological processes, like fruit ripening, flower and leaf abscission, senescence, many stress acclimations, and growth.
difficulty: 
medium
toefl frequency: 
1
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