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Which of the following statements does not characterize photoperiodism?

1. Mediated by florigen hormone
2. Conversion of shoot apex into flowering apex
3. Regulated by the length of day and night
4. Influenced by environmental cues

Answer :

Final answer:

The correct option is (1) which is 'mediated by florigen hormone.' The statement about photoperiodism being mediated by the florigen hormone does not characterize photoperiodism.

Explanation:

The correct option is (1) which is 'mediated by florigen hormone.' Photoperiodism in flowering plants is a response to the changing length of day and night as seasons change, which prompts plants to enter the reproductive phase by converting their shoot apices into flowering apices.

This change is significantly influenced by environmental cues, including the critical duration of uninterrupted darkness rather than simply the length of light exposure during the day. These environmental cues are sensed through a plant's phytochrome system which influences the timing of various growth stages such as flowering, bud setting, and vegetative growth. Day length is the most reliable indicator for plants to detect seasonal changes.

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