题目

补全对话（有两项多余）A: Welcome, Mr. Lu. B: Thank you, Rob. A: You study oceans. B: There are many kinds offish. But fishermen have caught too many of them. A: Do you mean they areoverfishing? B: Yes. A: That sounds a good idea. Lookat this article! Garbage (垃圾) in theocean is also a big problem. B: Yes. I read about theGreat Pacific Garbage Patch. Garbage collects (聚集) therebecause of the way the water moves. A: Yes. It is likean island of floating (漂浮的) rubbish.B: No. It's more like a soup.But it is full of plastic and chemicals (化学品) .A: That sounds terrible烟草被烟草花叶病毒（TMV）感染后，随着TMV大量繁殖，叶片将出现畸形、斑驳等现象。研究人员对烟草健康株和感病株的色素含量、光合速率等特性进行了研究。请回答下列问题：（1）分别用烟草花叶病毒的蛋白质外壳和RNA感染烟草，能在烟草叶片上出现病斑的是_________。烟草叶肉细胞的叶绿体中生成的ATP主要用于__________。（2）用_________作为溶剂提取叶片中的色素，再测定叶绿素的含量。测得两种植株的叶绿素含量如下表所示。结果显示：______________________。（3）下图表示不同光照强度下烟草健康株和感病株的净光合速率变化。当光照强度小于1500μmol·m-2·s-1时，感病株的净光合速率并未小于健康株，说明此阶段叶绿体中__________不是影响净光合速率的主要因素。（4）据上图判断，健康株和感病株的呼吸作用消耗有机物的速率基本相同，均为________，当光照强度为1500μmol·m-2·s-1时，健康株和感病株的实际光合速率均为_________。（5）强光条件下，感病株的光合作用速率受到影响，可能的原因是_________。