Friday, February 13, 2009

BAC Results Retest

The answer key for the retest has been corrected.

Here are the results of the meeting with the BAC on Wednesday. The committee brought me four questions to look at.

Question 12.

The correct answer for this question is (b). A mutualism is an interaction between two species in which both species gain a benefit. This is true when there is reciprocal altruism between different species of birds.

Correct answer (b)

Question 27.

The correct answer is (c). Some peopole argued that a similar question was on a past test that showed answer (a) as correct. The purpose of showing you old exams is to give you some idea of the form that the questions will take. This question was not on any information that I supplied you this year.

Correct answer (c)


Question 29.

The correct answer is (b). Some people tried to argue that (a) is also correct so ansswer (d) should be a suitable answer. However, by definition dN/dt = rN any time that r is not equal to zero, dN/dt must depend on population size.

Correct answer (b)

Question 30.

I wrote this question thinking that males fertilizing a female in pines was an example of exploitative competition (when an egg is fertilized it is effectively "consumed" because so other male can fertilize it). However, the way I wrote the question the same logic could be used to choose (b) as a correct answer. this confusion caused several students to choose answer (e). Thus, there is no best answer. I will throw out this question and everyone will receive credit for it.

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