Ethylene gas is described as which of the following in storage contexts?

• A. A naturally occurring plant hormone that can accelerate ripening in some fruits
• B. A toxic byproduct of decay
• C. Having no effect on ripening
• D. Only produced after fruits are removed from storage

Answer: (A)

Ethylene acts as a plant hormone that signals and accelerates ripening in many fruits. In storage contexts, it’s used—at controlled, low concentrations—to bring unripe climacteric fruit to market-ready ripeness in a predictable way. Because ethylene is a gas, it disperses through the storage space and can influence other fruit nearby, which is why managing its levels with ventilation or scavengers is a routine part of postharvest handling. It isn’t a toxic byproduct of decay; it’s a normal maturation signal produced by the fruit itself as part of ripening. Saying it has no effect on ripening misses the central role ethylene plays in triggering the enzymatic changes that soften tissue, break down acids, and alter sugars and aromas. Also, it isn’t accurate to claim it’s produced only after fruits are removed from storage—fruits often produce ethylene during storage as part of their ongoing maturation process.