. This hormone’s activity counters many of the growth-promoting effects of other hormones. A. Gibberellins B. Ethylene C. Abscisic Acid D. Auxin 12. These stimulate shoot elongation, seed germination, and fruit and flower maturation. A. Gibberellins B. Ethylene C. Abscisic Acid D. Auxin 13. It is the ability of plants to track time through the use of light A. Photoperiodism B. Phototropism C. Photomorphogenesis

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