Ag Crop Physiology Final Exam 2022 with complete solution

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Ag Crop Physiology Final Exam 2022 with complete solution Define a plant hormone -Ans>>a plant hormone is an organic compound that is synthesized in one part of the plant and translocated to anothe... r part, and in low concentrations it will cause a physiological response List the three primary groups of secondary metabolites and describe their chemical difference. -Ans>>-terpenes -phenolics -nitrogen- containing compounds What type of experiment did scientists conduct using Arabidopsis to help identify "floral identity genes" in flowering plants? -Ans>>They used and ABC model, using petals, sepals, stamen and carpel. They used mutations and measured the plants using this model If the soil is at field capacity(Yp=0) and the root hairs have a Yw= -0.3 and a Yp= 0.2, what is the Ys? -Ans>>-0.5 If salt water intrusion should occur and the soil is still at field capacity and the Ys of the soil = -3.0, the Yw of the root hairs becomes -1.1. This is caused by a ________________ pressure potential. -Ans>>lower This was a direct effect of water moving _____________ the root hair cells. -Ans>>out of The process by which this water movement and change in water potential occurred is called __________? -Ans>>diffusion This plant growth regulator is a relatively new hormone called ________? -Ans>>Brassinosteroids Their effect on plant growth is similar to_____? -Ans>>Auxins However they may stimulate ______________ production causing lateral root formation. -Ans>>Ethylene Although this growth hormone has been found to increase the yield of many crops, the response depended on the __________ under which the crop was grown. -Ans>>stress Abscisic acid is translocated in the vascular cambium, primarily in the _________. -Ans>>phloem During water stress the pH of xylem sap ______ favoring dissociated ABA. -Ans>>increases This result in redistribution of ABA in the leaf and thus increases ABA reaching the guard cells stimulating closing of the guard cells by potassium ____________. -Ans>>effux ABA inhibits ethylene production promoting root growth when the water potential is ____________. -Ans>>low _________ is the major site of free cytokinin synthesis. -Ans>>root apical meristem Cytokinins move from through the xylem into the ___________ -Ans>>shoot Cytokinins induce cell division in callus cells in the presence of _______________. -Ans>>Auxin Cytokinins promote ___________ formation leading to organogenesis in tissue culture. -Ans>>callus The rate limiting step for ethylene production is ___________ induced by wounding of the plant. -Ans>>ACC synthase ____________ inhibits ethylene synthesis by blocking ACC oxidase and used to prevent ripening of fruits in storage. -Ans>>carbon dioxide These types of fruit produce ethylene and can be stimulated to ripen by ethylene. _____________ -Ans>>Climacteric Ethylene can be used to help _________ fruits such as pineapples. -Ans>>ripen The most predominant auxin that stimulates elongation and promotes cell division is __________ -Ans>>indoleacetic acid A synthetic auxin that is used as a herbicide is called _________ -Ans>>2, 4-D Most auxins are synthesized from _________ by removal of the amino acid group and terminal carboxyl group. -Ans>>tryptophan [Show More]

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