The Gaseous Plant Hormone is ____

Question

The gaseous plant hormone is ____.  
A) auxin
B) gibberellin
C) cytokinin
D) abscisic acid
E) ethylene

Accepted Answer

Ethylene is the only gaseous plant hormone in the given options. It is released by plants in response to environmental stress such as drought, flooding, and injury, and is involved in processes such as fruit ripening, seed germination, and senescence.