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51.An oak woodland consists of the following organisms in each trophic level:1st trophic level: oak trees2nd trophic level: insects and spiders3rd trophic level: snakes and lizards4th trophic level: birdWhich of the following shows the relative number of organisms in each trophic level in... 顯示更多 51.An oak woodland consists of the following organisms in each trophic level: 1st trophic level: oak trees 2nd trophic level: insects and spiders 3rd trophic level: snakes and lizards 4th trophic level: bird Which of the following shows the relative number of organisms in each trophic level in the woodland? Questions 53 and 54 refer to the graph below which shows the distribution of four kinds of green algae (W,X,Y and Z) at different depths of water in a pond: 53.Whichplant is best adapted to the dim light conditions? 54.The probable relationship between X and Y is A)predation B)mutualism C)competition D)commensalism +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 55.If nitrogen-fixing genes can be transferred from leguminous plant into other crop plants, this can A)reduce the use of fertilizers/insecticides B)increase the suger content of the crop plants C)increase the resistance of crop plants to fungal infections

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51. 橡木森林地包括在每個食性层次的以下有機體：第1個食性层次：橡树第2個食性层次：昆蟲和蜘蛛第3個食性层次：蛇和蜥蜴第4個食性层次：鳥以下哪些展示有機體的相對数量在每個食性层次的在森林地？問題53和54提到之下顯示四种發行绿藻类的圖表在(W， X， Y和Z)在水的不同的深度在池塘： 53.Whichplant最好適應昏暗的采光条件？ 54.The X和Y之间的可能的關係是 A)掠奪行為 B)互助論 C)競爭 D)共棲 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 55.If nitrogen-fixing基因可以從豆类植物轉移入其他庄稼，這可能A)減少使用肥料或殺蟲藥 B)增量庄稼的suger內容 C)增量庄稼抵抗對真菌感染希望你識看簡体

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