Final answer:
The hormone that facilitates the quick ripening of green bananas and unripe avocados when placed in a brown bag is ethylene.
Step-by-step explanation:
The hormone involved in the ripening of green bananas or unripe avocados when kept in a brown bag is ethylene. This gaseous plant hormone is released by the fruits and becomes trapped in the bag, accelerating the ripening process. Ethylene stimulates the conversion of starch and acids to sugars, and a ripe fruit releasing ethylene can prompt other fruits nearby to ripen faster as well. This is an advantageous tactic employed to ripen fruits more quickly at home.
The hormone involved in ripening green bananas or unripe avocados is ethylene. Ethylene is a gas that is produced by aging tissues and nodes of stems. It stimulates the conversion of starch and acids to sugars, promoting fruit ripening. When green bananas or unripe avocados are kept in a brown bag, the ethylene gas released by the fruit gets trapped in the bag, accelerating the ripening process.