Plants which form flowers only when the day length exceeds 12 hours are called:

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Prepare for the Penn State Master Gardener Exam with comprehensive quizzes, flashcards, and multiple-choice questions. Each question is accompanied by hints and detailed explanations to help you succeed. Get ready to excel in your exam!

Multiple Choice

Plants which form flowers only when the day length exceeds 12 hours are called:

Explanation:
Photoperiodism governs when many plants flower by sensing how long the day is. Some plants need long days to flower; these are long-day plants. When daylight exceeds a certain threshold—around 12 hours for many species—these plants initiate flowering. The exact threshold varies by species, but the pattern is the same: longer days trigger flowering in long-day plants. In contrast, short-day plants flower when days are shorter than their threshold, and day-neutral plants flower regardless of day length. So, flowering only after day length passes the 12-hour mark fits the behavior of long-day plants.

Photoperiodism governs when many plants flower by sensing how long the day is. Some plants need long days to flower; these are long-day plants. When daylight exceeds a certain threshold—around 12 hours for many species—these plants initiate flowering. The exact threshold varies by species, but the pattern is the same: longer days trigger flowering in long-day plants. In contrast, short-day plants flower when days are shorter than their threshold, and day-neutral plants flower regardless of day length. So, flowering only after day length passes the 12-hour mark fits the behavior of long-day plants.

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