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1）Trichomes are hairlike outgrowths of the epidermis of plants that are thought to provide protection against beingeaten by herbivores (herbivory). In a certain plant species, stem trichome density is genetically determined.

To investigate variation in stem trichome density within the plant species, a student counted the number of trichomes on the stems of six plants in each of three different populations. The student used the data to calculate the mean trichome density (numbers of hairs per square centimeter) for each population. The results are providedin the table below.

TRICHOME DENSITY IN THREE PLANT POPULATIONS(number of trichomes/cm²)

1. On the axes provided, create an appropriately labeled graph to illustrate the sample means of the three populations to within 95% confidence (i.e., sample mean ±?2 SEM).
2. Based on the sample means and standard errors of the means, identify the two populations that are most likely to have statistically significant differences in the mean stem trichome densities. Justify your response.
3. Describe the independent and dependent variables and a control treatment for an experiment to test the hypothesis that higher trichome density in plants is selected for in the presence of herbivores. Identify an appropriate duration of the experiment to ensure that natural selection is measured, and predict the experimental results that would support the hypothesis.

 

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2014 AP Biology Practice Exam Free-Response Questions Free Download

2014 AP 生物模考簡答題部分免費下載

此套題共計時1小時30分鐘

共8題

每道大題可能含有不同數量的小題

可以使用簡單的Four-function計算器（帶有開平方功能）

考試時會提供相應的方程和等式列表

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2014 AP Biology Practice Exam FRQ真題題目

 

 

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