You place a tank of an unknown gas next to a tree full of green lemons and open the valve on the tank.The fruits ripen, and all of the leaves fall off.The tank most likely contained

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Ethylene is a plant hormone that is released naturally by some fruits, including ripening bananas and apples. When exposed to ethylene, plants undergo changes such as fruit ripening and leaf abscission (falling off). Therefore, the tank most likely contained ethylene, which caused the green lemons to ripen and the tree to lose its leaves. Choice B, 1-methylcyclopropene, is actually a chemical compound used to inhibit ethylene action and delay fruit ripening. Choices C, ether, D, oxygen, and E, nitrogen, do not have the same effect on plants as ethylene.

You Place a Tank of an Unknown Gas Next to a Tree