5.(1 pts) Plants use the relative abundance of Pr/Pfr to help track the day length. (Biological clocks are also involved.) Which of the following statements is correct? Bold the correct answer. A.High levels of Pfrtrigger development of flower primordia in short day plants by promoting transcription of the gene CO.B.High levels of Prdirectly inhibit the transcription of gene CO in long day plants.C.High levels Pfrtriggers development of flower primordia in long day plants by promoting transcription of the gene CO.D.When Prlevels are high relative to Pfrlevels, plants have been exposed to a long duration of daylight. This graded assignment is subject to the Virginia Tech Honor Code. Sharing or posting any content from this assignment, or using such shared or posted assignment content to answer assignment questions, is a violation of the Virginia Tech Honor Code.297 5
BIOL 1106 Classwork Spring 2019 Part II. Plant Life Cycle Events Table:(5 pts; 0.5 pts per cell) Plants that live in the temperate zone (such as in Virginia) must deal with seasonal changes in temperature and photoperiod that significantly affect their life cycle. Plant responses to the changing environmental conditions are coordinated by various plant hormones.The table below contains a partial list of life cycle events. Fill in the empty cells by matching the appropriate environmental cue and the major hormone involved in coordinating each event. Enter the letter and the text into the table. Some answers may be used more than once, or not at all. Event Environmental Cues Hormones Seeds become dormant Insufficient water, unfavorable temperatures E Dormancy is broken seed s germinate A Gibberellins, Auxin Roots orient downward in soil and shoots orient upward Gravity B Root and stem branching G Cytokinins, auxin Apical dominance in shoot Intact apical meristem B Flowering in light dependent plants Favorable day length D Development of fruit and seed F Auxin Fruit ripening E Ethylene Abscission of leaves Unfavorable water, temperature, or day length E Bud dormancy B Abscisic acid, auxin Environmental Cues A. Favorable water, temperature, or day length B. Temperature or light decrease C. Gravity D. Favorable day length E. Favorable water, temperature, or day length; ripening of other fruits F. Favorable water, temperature, or day length following pollination G. Removal of apical meristem Hormone A. Ethylene (used more than once) B. Auxin (used more than once) C. Gibberillin, auxin D. CO protein E. Abscisic acid This graded assignment is subject to the Virginia Tech Honor Code. Sharing or posting any content from this assignment, or using such shared or posted assignment content to answer assignment questions, is a violation of the Virginia Tech Honor Code.297 6
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