Which option is NOT a method for triggering flowers to bloom at the desired time?

• A. Manipulating photoperiod
• B. Increasing exposure to carbon dioxide
• C. Temperature treatment
• D. Gibberellin application

Answer: (B)

Flowering timing is governed by environmental cues and hormonal signals that plants use to decide when to switch from vegetative growth to reproductive growth. Manipulating photoperiod uses the length of day and night to trigger blooming, and temperature treatment can induce flowering through processes like vernalization or heat exposure. Gibberellin application is a hormone-based approach that, in many species, can promote flowering even when the natural cues aren’t ideal. Increasing exposure to carbon dioxide, however, mainly boosts photosynthesis and overall growth rather than providing a reliable signal to start flowering at a specific time. It affects vigor and yield more than the timing of bloom, so it isn’t used as a method to trigger blooming at a desired time.