According to one explanation of the "confusion effect," a fish that swims in a school will have greater advantages for survival if it ________.

Tends to be visible for no more than 200 meters

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Stays near either the front or the rear of a school

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Is part of a small school rather than a large school

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Is very similar in appearance to the other fish in the school

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Is medium-sized

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Solution

The correct option is D Is very similar in appearance to the other fish in the school
According to the passage, "In many schools, the fish are almost identical in appearance, making it difficult for a predator to select one." Because predators, according to the "confusion effect," prefer to select prey that is distinct from the rest of the school, a fish that is similar in appearance to the other fish in its school would most likely enjoy a survival advantage. Hence, the correct answer is Option D.

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Read the following passage and answer the question that follows.

Until recently, many biologists believed that invertebrate “schools” were actually transient assemblages, brought together by wind, currents, waves, or common food sources. Jellyfish groupings, for example, cannot be described as schools—cohesive social units whose members are evenly spaced and face the same way. However, recent research has found numerous cases in which crustaceans and other invertebrates form schools as fish do. Schooling crustaceans such as krill regularly collect in such massive numbers that they provide abundant food for fish, seabirds, and whales. Like schooling fish, invertebrates with sufficient mobility to school will swim in positions that are consistent relative to fellow school members, and are neither directly above nor directly below a neighbor. The internal structure of such a school changes little with external physical disruption but dramatically with the advent of a predator. Since schooling is an active behavior, researchers assume that it must bring important benefits. True, schooling would appear to make animals more visible and attractive to predators. However, schooling leaves vast tracts of empty water, thereby reducing a predator’s chances of picking up the school’s trail. A large group maintains surveillance better than an individual can, and may discourage predation by appearing to be one massive animal.

According to the passage, what are the advantages of schooling for invertebrates?

Q. School A has 30% more student than school B. if 120 more students join school B , The two schools will have the same number of students. what is the sum of the number of students in school A and school B initially ?

Q. In an examination, the percentage of students qualified to the number of students appeared from school

A

70 %

. In school

B

, the number of students appeared is

20 %

more than the students appeared from school

A

and the number of students qualified from school

B

50 %

more than the students qualified from school

A

. What is the percentage of students qualified to the number of students appeared from school

B

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