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Which one is a long-day plant?

1. Tobacco
2. Glycine max
3. Mirabilis jalapa
4. Spinach

Correct answer: Spinach

Solution

Spinach is a classic long-day plant, meaning it flowers when day length exceeds a critical threshold. The other options are not standard long-day examples: tobacco and Glycine max are typically short-day plants, while Mirabilis jalapa is a short-day plant.

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