Which gas is used for artificial ripening of green fruit ?

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Which gas is used for artificial ripening of green fruit ?A. Carbon dioxide
B. Acetylene
C. Ethane
D. Ethylene

Ethylene plays a vital role in the natural ripening of fruits. It is a hormone produced naturally within the fruits to stimulate ripening process. Ethylene, being a natural hormone, does not pose any health hazards to consumers, the guidance note points out.