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Answer :
Final answer:
The statement that does not characterize photoperiodism is that photoperiodism is influenced by gravity. This biological response is primarily a reaction to the duration of daylight, and gravity has no role in this process. Thus the option (c) is the correct answer.
Explanation:
The statement that does not characterize photoperiodism is: c. Photoperiodism is influenced by gravity. Photoperiodism is the biological response to the timing and duration of day and night which controls various processes in plants, such as flowering, setting of winter buds, and vegetative growth. It operates primarily through the phytochrome and cryptochrome systems, triggering photoperiodic responses by influencing gene expression, which leads to the production of specific mRNA molecules necessary for the transformation of vegetative shoot apical meristems into floral meristems. Florigen is a hypothetical hormone thought to induce this change, but gravity does not influence photoperiodism.
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