Long-day plants normally do not flower during the winters.Horticulturalists can trigger the process of flowering in a long-day plant during winters by
Correct answer: B. Exposing the plant to a light source during the night
- A. Keeping the plant warm during the night-time
- B. Exposing the plant to a light source during the night
- C. Covering the plant with a black cloth for 12 hours a day
- D. Covering the plant with a transparent plastic during the daytime
Explanation
Long-day plants require a certain length of daylight to trigger flowering. By artificially extending the day length with additional light exposure during the night, horticulturalists can induce flowering in these plants even during the shorter days of winter. Option B is correct because it involves increasing the exposure to light, simulating longer days. Option A is incorrect as warmth does not directly affect photoperiodism. Option C is incorrect because reducing the light period with a black cloth simulates shorter days, which is unsuitable for long-day plants. Option D is incorrect as covering with transparent plastic does not alter the light exposure significantly.
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About Plant Growth Regulators
Plant growth regulators are chemical messengers that control growth, development and responses to the environment. The topic covers auxins, gibberellins, cytokinins, abscisic acid and ethylene, including cell elongation, apical dominance, tropisms, seed germination, dormancy, fruit ripening and leaf fall, with growth promoters distinguished from inhibitors.
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