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Spraying sugarcane crop with gibberellins increases the length of the stem, thus increasing the yield by as much as 20 tonnes per acre.

1. Gibberellins increase sugarcane yield.
2. Gibberellins increase stem length.
3. Gibberellins increase sugarcane production.
4. Gibberellins are used in sugarcane farming.

Correct answer: Gibberellins increase stem length.

Solution

The statement says spraying sugarcane with gibberellins increases the length of the stem, and that this leads to higher yield. The directly supported conclusion is that gibberellins increase stem length.

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