MCS-R13 - Marvel EDU

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Practice Reading: Multiple Choice, Single Answer ID: #33380 MCS-R13

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Read the text and answer the multiple-choice question by selecting the correct response. Only one response is correct.

One explanation for the tendency of animals to be more vigilant in smaller groups than in larger ones assumes that the vigilant behavior—looking up, for example—is aimed at predators. If individuals on the edge of a group are more vigilant because they are at greater risk of being captured, then individuals on average would have to be more vigilant in smaller groups, because the animals on the periphery of a group form a greater proportion of the whole group as the size of the group diminishes. However, a different explanation is necessary in cases where the vigilant behavior is not directed at predators. J. Krebs has discovered that great blue herons look up more often when in smaller flocks than when in larger ones, solely as a consequence of poor feeding conditions. Krebs hypothesizes that the herons in smaller flocks are watching for herons that they might follow to better feeding pools, which usually attract larger numbers of the birds.

It can be inferred from passage that in species in which vigilant behavior is directed at predators, the tendency of the animals to be more vigilant in smaller groups than in larger ones would most likely be minimized if which of the following were true?

* Click on the correct answer

The vigilance of animals on the periphery of a group always exceeded that of animals located in its interior, even when predators were not in the area. The risk of capture for individuals in a group was the same, whether they were located in the interior of the group or on its periphery. Animals on the periphery of a group tended to be less capable of defending themselves from attack by predators than animals located in the interior of the group. Animals on the periphery of a group tended to bear marks that were more distinctive to predators than animals located in the interior of the group.

Result:

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Option 2: "The risk of capture for individuals in a group was the same, whether they were located in the interior of the group or on its periphery."

Explanation: This option aligns with the text's explanation that vigilance is heightened in smaller groups due to increased risk for peripheral individuals. If the risk of capture is equal for all, then the motivation for heightened vigilance in smaller groups would be minimized, as there would be no greater threat for those on the edge.

Option 1: "The vigilance of animals on the periphery of a group always exceeded that of animals located in its interior, even when predators were not in the area."

Explanation: This option suggests that peripheral animals are always more vigilant, regardless of predator presence. However, the text indicates that increased vigilance in smaller groups is linked to the risk of capture by predators. If vigilance is constant regardless of predator presence, it does not address the context of group size and predator risk, making this option irrelevant.

Option 3: "Animals on the periphery of a group tended to be less capable of defending themselves from attack by predators than animals located in the interior of the group."

Explanation: This option implies a difference in defensive capability based on location within the group. However, the text does not discuss defensive capabilities; it focuses on vigilance related to perceived risk. Thus, this option introduces an unrelated factor that does not address the core issue of vigilance and group size.

Option 4: "Animals on the periphery of a group tended to bear marks that were more distinctive to predators than animals located in the interior of the group."

Explanation: This option suggests that peripheral animals are more easily identifiable to predators, which could increase their risk. However, the text does not mention distinctive markings as a factor influencing vigilance. Instead, it emphasizes the relationship between group size and vigilance due to risk of capture, making this option irrelevant.

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