IB生物课程真题练习讲解（三）

　　对于部分生物基础相对薄弱、同时处于完全自学状态的考生，如果想要在IB生物上取得相对理想的成绩，个人建议提前半年开始准备，因为个人准备过程中需要阅读英文教材，阅读教材的时候往往难以理解教材内容。所以建议这部分考生先阅读教材再报辅导班，在课堂上消化难点知识，然后自己再重新阅读教材，并配以相当量的练习。

　　同时还建议这部分考试对教材多阅读几遍，阅读一遍难以对知识点形成印象。

　　试题分析

　　During the industrial revolution, a major change was observed in many insect species due to the mass production and deposition of ash and soot around cities and factories. One of the most famous instances was within the spotted moth populations. An ecological survey was performed where the number of spotted moths and longtail moths were counted in 8 different urban settings over a square kilometer in 1802. A repeat experiment was performed 100 years later in 1902. The results of the experiment are shown below.

　　How would the results of this study have been different, if factories produced white or light gray ash and soot rather than black?

　　(A) There would be no change to the results of the experiment.

　　(B) There would been added selection pressure for more white-bodied spotted moths and against black-bodied spotted moths.

　　(C) There would been added selection pressure for more black-bodied spotted moths and against white-bodied spotted moths.

　　(D) There would have been an increase in the frequency of both black-bodied and white-bodied spotted moths.

　　题目解析

　　题目问如果工厂的烟尘是白色的、浅色的，而非黑色的，那么对实验结果会有何影响。

　　如果烟尘是白色的，那么白色的蛾子会更容易生存，自然选择会使得蛾子种群中白色的品种更容易生存和繁衍后代，因此选(B) There would been added selection pressure for more white-bodied spotted moths and against black-bodied spotted moths。

　　以上就是小编为大家整理的关于IB生物课程难点及真题练习讲解，希望对大家有所帮助。更多ib课程都有哪些内容、ib课程指的是什么等问题可以咨询我们。