Q: What gas is used for artificial ripening of green fruit?  

Answer: D

Acetylene gas is commonly used in the artificial ripening of green fruit. It acts as a plant hormone and triggers the fruit to ripen faster. When acetylene gas is released, it gets converted to ethylene, which then stimulates the production of enzymes that break down the cell walls and chlorophyll in the fruit, leading to ripening. However, the use of acetylene gas for fruit ripening is controversial as it can pose health hazards and affect the quality of the fruit. Therefore, some countries have banned its use, and alternative methods are being explored.

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