Question 2
csaluja wrote:
Hi GMATNinja,
I was wondering could you please explain why option A is incorrect for Q2? The passage states that carotenoids are used "by the immune system for detoxification processes". It is also given that "males can use scarce carotenoids either for immune defense and detoxification or for attracting females". Based on this, can't we infer that a lack of bright coloration means that the carotenoids were used by the immune system or rather the detoxification was inefficient? I understand why option C is correct because we are strictly told about this option in the last line of our paragraph; however, I am unable to see the true reasoning behind why option A is incorrect.
If you could please share your thoughts behind it, I would immensely appreciate it!
Question 2 asks us which answer choice is most likely indicated by "a lack of bright coloration in a male" based on the idea that carotenoids are required for health.
The key to eliminating (A) is in the exact wording of the answer choice:
Quote:
(A) Inefficient detoxification processes
You are right that the passage mentions using carotenoids for detoxification processes, but what does it say about the
efficiency of these processes? To answer this, look at the evidence stated in the passage:
Quote:
Males that are more susceptible to disease and parasites will have to use their carotenoids to boost their immune systems, whereas males that are genetically resistant will use fewer carotenoids for fighting disease and will advertise this by using the pigments for flashy display instead.
This evidence tells us that some males have to use more carotenoids to boost their immune systems because they are more susceptible to disease and parasites. In other words, some males have to expend their carotenoids on immunity and detoxification because they are more likely to acquire a disease/parasite than other males.
What this does
not tell us is
how efficient the detoxification processes for either type of male is after they already acquired a disease/parasite. The drab males could have detoxification processes
just as efficient as their flashy counterparts, but still use more carotenoids to boost their immunity because they are more susceptible to disease/parasites in the first place.
Because of the above reasoning, we cannot conclude that "a lack of bright coloration in a male is most likely to indicate" that those males have "
inefficient detoxification processes." (A) is not the answer to question 2.
As you point out, the evidence in support of (C) is clear: the passage states that "males that are
genetically resistant will use fewer carotenoids for fighting disease and will advertise this by using the pigments for flashy display instead." So, we can easily infer that a lack of bright coloration indicates "low genetic resistance to disease." (C) is the correct answer.