PCA EXAM DEFOLIANTS QUESTIONS WITH CORRECTRY ANALYZED ANSWERS (ACTUAL EXAM) ALREADY GRADED A+ LATEST 2024 Ethylene - ANSWERS -Increases in tissue ethylene synthesis and cincentrations have been shown to be associated with progessive degradation of ribonucleic acids and chloryphyll, and of the solubizatio of some leaf proteins, all of which are factors that reduce th long -term viability of plant tissues. Ethylene has also been implicated as involved in promoting senesecne through impacts on activation of specif ic enzymes ABA - ANSWERS -Increases in ABA concentrations occur during sennescene and can be associated with changes in tissue chloryphyll concentrations and other cellular constituents Harvest Aid Chemical - ANSWERS -chemicals with various modes of action that facilitate machine harvest by influencing boll opening, reducing the ammount of foilage retained on plants at harvest, speeding tissue dessication, and controlling regrowth Defoliation - ANSWERS -Leaf loss or leaf absicisson. In cotton production, it usually refers to leaf loss associated with application of a chemical that injures the leaf. Defoliation can also occur through natural leaf maturation and senessence, particularl y with cooling weather after boll development Desiccation - ANSWERS -acclereated drying of plant tissue List re ason for using harvest aids - ANSWERS --Prepare cotton for harvest in a more predictable and timely manner -Help straighten lodged plants for better drying and picking -Reduce the number of high -moisture -content green leaves, which otherwise would lower f iber grade -Can stimulate and enhance boll opening and increase yield and quality -can reduce leaf trash and other impurities at harvest and in the gin -improve the uniformity of boll opening and maturity required for mechanical harvested cotton -reduc e the chances of fiber damage due to high water content in modules of harvested cotton -Reduce lint losses associated with excessive need for cleaners during ginning when cotton has higher trash content -Promote a more uniform preperation and condition o f cotton that can improve the speed of ginning -Improve efficency in use of labor and equipment for harvest
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