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A pineapple plant flowers only once, and produces one pineapple. Then it dies. But before it dies it also produces offspring. Auxin and ethylene can be applied to artificially induce flowering in pineapple to increase yield throughout the year. Applied auxin mimics the action of ethylene by stimulating ethylene formation, and that ethylene, not auxin, causes pineapples to flower. Ethylene initiates flowering and helps in fruit-set in pineapples.

1. Auxin induces flowering in pineapples.
2. Ethylene induces flowering in pineapples.
3. Auxin mimics ethylene action in pineapples.
4. Ethylene helps in fruit-set in pineapples.

Correct answer: Ethylene induces flowering in pineapples.

Solution

The passage states that applied auxin only mimics ethylene by causing ethylene formation. Since ethylene is the hormone that actually initiates flowering in pineapple, the correct choice is the one saying ethylene induces flowering.

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