Flowering is often delayed in plants whose leaves have been eaten by herbivores You do an experiment in the lab where you remove leaves of different ages as different plants approach the day length that triggers flowering. You find that only stems with at least some mature leaves flower at the usual time. You conclude that:

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Quizplus · Accepted Answer

Florigen is a hormone that promotes flowering. It is produced in leaves and transported to the shoot apical meristem, where it triggers the formation of flowers. If leaves are removed, then there is no source of florigen, and flowering will be delayed.

Flowering Is Often Delayed in Plants Whose Leaves Have Been