Which plant is LDP? - DASH

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Question

Which plant is LDP?

Tobacco

Glycine max

Mirabilis jalapa

Spinach

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Step-by-Step Explanation 1. Introduction to Photoperiodism Photoperiodism is the physiological reaction of plants to the relative lengths of light and dark periods. Different plants require specific durations of day (light period) or night (dark period) to initiate flowering. 2. Types of Plants Based on Photoperiodic Response There are three main categories of plants with respect to photoperiod and flowering: Short Day Plants (SDPs): These plants flower when the daytime is shorter than a certain critical length. They usually require a long uninterrupted dark period. Examples include Nicotiana tabacum (tobacco) and Glycine max (soybean). Long Day Plants (LDPs): These plants flower when the daytime is longer than a certain critical length. Examples include Hyoscyamus niger (henbane), radish (Raphanus sativus), beet (Beta vulgaris), and spinach (Spinacia oleracea). Day-Neutral Plants: These plants can flower irrespective of day length. Examples include tomato (Lycopersicon esculentum), maize (Zea mays), and cucumber (Cucumis sativus). 3. Identifying the Correct Answer: Spinach Spinach (Spinacia oleracea) is classified as a Long Day Plant (LDP). It requires a photoperiod greater than its critical day length to trigger flowering. This explains why Spinach is the correct answer among the given options. 4. Conclusion Since spinach needs a longer light period for flowering, it is characterized as a Long Day Plant (LDP). Therefore, among the provided options, spinach is the correct choice.

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