It was observed during the early 20th century that the abscission zone of leaves of tree growing close to gas burning street lamps weakened (entered the abscission phase) earlier than trees located further away from the lamps. Experiments showed that weakening of the abscission zone was not caused by either the lamp's light or heat. Instead the research on this phenomenon led to the discovery of a new gaseous plant hormone. What is this hormone? Ethylene Abscisic acid (ABA) Gibberellins Auxin Strigolactone Cytokinin

It was observed during the early 20th century that the abscission zone of leaves of tree growing close to gas burning street lamps weakened (entered the abscission phase) earlier than trees located further away from the lamps. Experiments showed that weakening of the abscission zone was not caused by either the lamp's light or heat. Instead the research on this phenomenon led to the discovery of a new gaseous plant hormone. What is this hormone? Ethylene Abscisic acid (ABA) Gibberellins Auxin Strigolactone Cytokinin

Biology: The Unity and Diversity of Life (MindTap Course List)

14th Edition

ISBN:9781305073951

Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Chapter30: Communication Strategies In Plants

Section: Chapter Questions

Problem 4DAA: Volatile Secondary Metabolites in Plant Stress Responses In 2007, researchers Casey Delphia, Mark...

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The summer is not optimal for grape growing and you're searching in your memory for something regarding plant hormones. Explain 2 ways you could utilize plant hormones (choose from auxin, ethylene, cytokinin, gibberellin, abscisic acid, salicylic acid, jasonic acid) to compensate for a problem during growing. For each way:
The pathogenic fungus Fusicoccum amygdali secretes atoxin called fusicoccin that activates the plasma membrane proton pumps of plant cells and leads to uncontrolled water loss. Suggest a mechanism by which theactivation of proton pumps could lead to severe wilting.
Cotton plants wilt within a few hours of flooding of their roots. The flooding leads to low-oxygen conditions, increases in cytosolic Ca2+ concentration, and decreases in cytosolic pH. Suggest a hypothesis to explain how flooding leads to wilting.
Explain the logical reasons for the following terms briefly. 1. How does the plant determine passage of night and day? 2. Pyruvate oxidation. 3. C4 pathway. 4. Oxidation of glucose.
Even though C4 plants require more ATP per CO₂ fixed, at higher temperatures, they are more efficient than C3 plants. Which of the following explains the effectiveness of C4 plants? contains a mutant form of Rubisco that does not bind to oxygen oxygen is prevented from entering the bundle-sheath cells where Rubisco is found Oduring the night, carbon dioxide is stored as malate so that stomata do not need to open during the day O photorespiration in C4 plants produces energy while in C3 plants, energy is consumed
Which type of the following play a role in the gravitropic response of plants according to the statolith hypothesis? amyloplasts chloroplasts receptors calcium ions O O O O
Sugars, oils, reisonous bodies and water are also essentials of plants. How do each of them contribute in the resistance of plants from extreme conditions?
You have been chosen as the lead student gardener for the CSUMB Future Farmers of America Club (FFAC). Your club is looking to you and your Bio211 plant experience to guide them. You arrive at the new FFAC garden plots and notice that while there are many fruits on the apple tree, they seem to remain hard, sour, and green. Your club mates need the red, sweet apples in just a few days for the apple competition. Choose the best hormone to apply and the reason supporting its use: Select one: a. Apply ethylene to the apples to increase ripening. b. Apply ethylene to slow ripening and increase chlorophyll levels. c. Apply auxin to increase parthenocarpy d. Apply gibberellins to increase fruit size. e. Apply auxins to decrease apical dominance and increase water intake.
Name the synthetic growth substances from plant hormones abscisic acid and ethylene and discuss their commercial applications
Volatile Secondary Metabolites in Plant Stress Responses In 2007, researchers Casey Delphia, Mark Mescher, and Consuelo De Moraes (pictured at left) published a study on the production of different volatile chemicals by tobacco plants in response to predation by two types of insects: western flower thrips and tobacco budworms. Their results are shown in FIGURE 30.20. Volatile Compound Produced Treatment C T W WT HV HVT Myrcene 0 0 0 0 17 22 -Ocimene 0 433 15 121 4.299 5.315 Linatod 0 0 0 0 125 178 indole 0 0 0 0 74 142 Nicotine 0 0 233 160 390 538 -Etemene 0 0 0 0 90 102 -Caryophyllene 0 100 40 124 3.704 6.166 -Humutene 0 0 0 0 123 209 Sesquiterpene 0 7 0 0 219 268 -Farnesene 0 15 0 0 293 457 Caryophyltene oxide 0 0 0 0 89 166 Total 0 555 288 406 9.423 13.563 FIGURE 30.20 Volatile (airborne) compounds produced by tobacco plants (Nicotiana tabacum) in response to predation by Different inserts. Plants were untreated (C), attacked by thrips (T), mechanically wounded (W). mechanically wounded and attacked by thrips (WT), attacked by budworms (HVJ, or attacked by budworms and thrips (HVTJ. Values are nanograms/day. 3. Which one of the chemicals tested is most likely produced by tobacco plants in a nonspecific response to predation?
Volatile Secondary Metabolites in Plant Stress Responses In 2007, researchers Casey Delphia, Mark Mescher, and Consuelo De Moraes (pictured at left) published a study on the production of different volatile chemicals by tobacco plants in response to predation by two types of insects: western flower thrips and tobacco budworms. Their results are shown in FIGURE 30.20. Volatile Compound Produced Treatment C T W WT HV HVT Myrcene 0 0 0 0 17 22 -Ocimene 0 433 15 121 4.299 5.315 Linatod 0 0 0 0 125 178 indole 0 0 0 0 74 142 Nicotine 0 0 233 160 390 538 -Etemene 0 0 0 0 90 102 -Caryophyllene 0 100 40 124 3.704 6.166 -Humutene 0 0 0 0 123 209 Sesquiterpene 0 7 0 0 219 268 -Farnesene 0 15 0 0 293 457 Caryophyltene oxide 0 0 0 0 89 166 Total 0 555 288 406 9.423 13.563 FIGURE 30.20 Volatile (airborne) compounds produced by tobacco plants (Nicotiana tabacum) in response to predation by Different inserts. Plants were untreated (C), attacked by thrips (T), mechanically wounded (W). mechanically wounded and attacked by thrips (WT), attacked by budworms (HVJ, or attacked by budworms and thrips (HVTJ. Values are nanograms/day. 4. Are any chemicals produced in response to predation by budworms, but not in response to predation by thrips?
A) The concentration of CO2 is lower inside a plant cell than in the atmosphere (outside the cell). In your own words, describe how the CO2 levels are kept low inside the plant cell and explain why this is necessary. Assume stomata are open. B) Regarding the situation presented in Part A and assuming that the stomata of the plant leaves are closed, would this favour the induction of photorespiration in a C3 plant? Explain. Make reference to relevant molecule or molecules as needed. Please clearly label your responses as A and B