Distinguish between short day and long day plants giving two examples of each. What is the role of phytochrome in flowering?

Short-day plants require a longer period of darkness than light to initiate flowering. These plants flower when the duration of darkness exceeds a critical threshold, typically during autumn or winter when days are shorter. Examples of short-day plants include Chrysanthemum and Poinsettia. On the other hand, long-day plants require a longer period _________ ____ _____ ________ _________ _____ _____ ______ _____.
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