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第I卷(选择题共144分) 本卷共24题,每题6分,共144分.在下列各题的四个选项中,只有一个选项是符合题目要求的. 1.2000年12月1日是上个世纪最后一个“世界爱滋病日”,爱滋病已成为本世纪人类需要攻克的主要难题之一.爱滋病的主要传播媒介是( ) A.蚊和蝇 B.握手和拥抱 C.泳池和卧具 D.血液和精液 2.若一粒玉米种子中胚乳的基因型为MMmNnn,则该种子胚的基因型可能为 ( ) A.MMnn B.MmNn C.MMNn D.MmNN 3.通过测定CO2的交换量,用右图表示光强度和CO2浓度对光合作用速度的影响.图中从A到D,在哪一点上光作为限制因子?( ) 4.菊花通常都在秋天开放,若打算使菊花提前
Volume I (Multiple-choice questions with a total of 144 points) This volume consists of 24 questions, with 6 points for each question, for a total of 144 points. Among the four options for the following questions, only one option meets the requirements of the title. 1. December 1, 2000 It was the last “World AIDS Day” in the last century. AIDS has become one of the major problems humans need to overcome in this century. The main vectors of AIDS are () A. Mosquitoes and flies B. Shaking hands and hugging C. Pools and bedding D Blood and semen 2. If the endosperm genotype of a corn seed is MMmNnn, the genotype of the seed embryo may be () A.MMnn B.MmNn C.MMNn D.MmNN 3. By measuring the exchange of CO2 The right figure shows the effect of light intensity and CO2 concentration on the speed of photosynthesis. From the point A to D in the figure, at what point does the light act as a limiting factor? () 4. Chrysanthemum is usually open in the fall if you plan to make the chrysanthemum ahead of time.