Question

Which hormone is only plant hormone present in gaseous form.

Answer 1

1. Ethylene (CH2=CH2) is acting as a natural plant hormone.
2. It is the first and only gaseous plant hormone.
3. It is regulating the fruit ripening, opening of flowers, and abscission of leaves.
4. In commercial fruit-ripening areas, they will use "catalytic generators" to make ethylene gas from ethanol.