Question

Which plant hormone is responsible for ripening of fruits?

Answer 1

Hint: Ethylene is a crucial factor in plant ageing, including fruit ripening, flower and leaf senescence, and flower and leaf senescence. Ethylene is responsible for texture changes, softening, colour changes, and other ripening processes.

Complete answer:
Ethylene is a plant growth regulator or hormone that stimulates the ripening of fruits and speeds up the process. Ethylene gas is utilised in the commercial ripening of fruits. In the amounts observed in ripening rooms, ethylene has been determined to be neither hazardous nor dangerous to humans.
In fact, ethylene was utilised as an anaesthetic in hospitals at doses far higher than those seen in a ripening room. Ethylene promotes the ripening of fruits including tomatoes, lemons, and oranges. It also raises the rate of breathing. It also controls senescence and abscission. It's also in charge of breaking dormancy. Headaches, dizziness, weariness, lightheadedness, confusion, and unconsciousness can all be symptoms of Ethylene exposure.
Ethylene is a DANGEROUS FIRE and EXPLOSION HAZARD since it is HIGHLY FLAMMABLE and REACTIVE. Fruit ripening is caused by a natural form of ethylene, a gaseous plant hormone that is produced to make PVC (polyvinyl chloride) pipework and plastic bags. When fruits ripen, they usually emit a ripening signal, which is a burst of ethylene production. Ethylene is a simple hydrocarbon gas ($H_2C$=$CH_2$) produced and released into the environment by ripening fruits.

Note:
Ethylene is most widely used in agriculture. Ethephon is the most common source of ethylene. Gibberellins can be used to stop seed dormancy and promote flowering, increasing fruit size. This is also most commonly used in the market for ripening of the fruits and vegetables like tomatoes, lemon and oranges.