皮皮学，免费搜题
登录
搜题
【简答题】
有人做了如下实验，将深色尺蛾和浅色尺蛾分别进行标记，然后放养于工业污染区和没有污染的非工业区．经过一段时间以后，将所释放的尺蛾尽量收回，统计其数目，结果如下表： 地区 浅色尺蛾 深色尺蛾 释放数 回收数 释放数 回收数 工业污染区 64 16 154 82 非工业区 393 154 406 19 （1）尺蛾的体色在遗传学上叫做______． （2）尺蛾的个体发育要经过卵、幼虫、蛹、成虫四个阶段，我们把这种发育过程叫做______． （3）在工业污染区深色尺蛾的回收率比较高，这说明生物对环境具有______． （4）如果严厉禁止污染，工厂的排烟量大大减少．请你预测，尺蛾的类型将产生怎样的变化？______． （5）尺蛾的幼虫对树的危害很大，但目前对它的防治仍然是以喷洒药剂毒杀为主．这种方法虽然有效，但往往会伤及其他昆虫和以这些昆虫为食的鸟类，这不利于______．
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】听力原文：W: Excuse me, does the No. 8 bus go to the Wang Fu Jing Department Store? M: No, it doesn't. You'll have to change to a No. 3 bus at Sha Tan. Or, if you don't mind walking, you can take this bus ...
A.
Go to Wang Fu Jing Department Store.
B.
Play at the Workers Club Building.
C.
Ask the way from the man.
【简答题】Alice is from England. She is thir. She is a student in a high school in Jing Hong, Yunnan. Alice often gets up at about 6:30 on weekdays(工作日). She often has a glass of milk, an egg and some bread...
【单选题】听力原文：W: Excuse me, does this No. 8 bus go to the Wang Fu Jing Department store? M. No, it doesn’t. You' ll have to change to a No. 3 bus at Sha Tan. Or, if you don't mind walking, you can take this bu...
A.
Go to Wang Fu Jing Department Store.
B.
Play at the Workers Club Building.
C.
Ask the way from the man.
【简答题】CCTV anchorman Luo Jing died of cancer on June 5 ,2009 at the age of 48. In 1983 ,graduating from Beijing Broadcasting Institute, he began his career as a prime time newscaster for CCTV .Over the past...
相关题目：
参考解析：
知识点：
题目纠错 0
发布
