GRE Reading Comprehension Practice Questions with Explanations

Each passage in this section is followed by several questions. After reading the passage, choose the best answer to each question based on the content of the passage. Answer all questions following the passage on the basis of what is stated or implied on the passage

" Although the schooling of fish is familiar form of animal social behavior, how the school is formed and maintained is only beginning to be understood in detail. It had been thought that each fish maintains its position chiefly by means of vision. Our work as shown that, as each fish maintains its position, the lateral line, an organ sensitive to transitory changes in water displacement, is as important as vision. In each species a fish has a “preferred” distance and dangle from its nearest neighbor. The ideal separation and bearing, however, are not maintained rigidly. The result is a probabilistic arrangement that appears like a random aggregation. The tendency of the fish to remain at the preferred distance and angle, however, serves to maintain the structure. Each fish, having established its position, uses its eyes and its lateral lines simultaneously to measure the speed of all the other fish in the school. It then adjusts its own speed to match a weighted average that emphasizes the contribution of nearby fish. "

Practice Question 1:

According to the passage, the structure of a fish school is dependent upon which of
the following.

I. Rigidly formed random aggregations
II. The tendency of each fish to remain at a preferred distance from neighboring fish
III. Measurement of a weighed average by individual fish

A. II only
B. III only
C. I and II only
D. I and III only
E. II and III only

Practice Question 2:

Which of the following best describes the author’s attitude toward the theory that the
structure of fish schools is maintained primarily through vision?

A. Heated opposition
B. Careful neutrality
C. Considered dissatisfaction
D. Cautious approval
E. Unqualified enthusiasm

Practice Question 3:

The passage suggests that, after establishing its position in the school formation, an
individual fish will subsequently

A. Maintain its preferred position primarily by visual and auditory means
B. Rigorously avoid changes that would interfere with the overall structure of the school
C. Make conscious sensory readjustments to its position within the school
D. Make unexpected shifts in position only if threatened by external danger
E. Surrender its ability to make quick, instinctive judgement.

GRE Reading Comprehension: Answers and Explanations

Schools of Fish Passage

The style of this natural science passage is factual, descriptive, and straightforward, although the discussion does get fairly detailed. The topic is clear from the first sentence: our knowledge of how fish schools are formed and how their structure is maintained. The next two sentences get more specific and express the author’s main point, which is that, contrary to the previous theory, the structure of fish schools is not merely dependent on vision but also involves “the lateral line, an organ sensitive to transitory changes in water displacement.” The tone is objective and positive, but it’s worth noting that since the author is contrasting the new knowledge about lateral lines with older, outdated knowledge, he must be sceptical of the notion that the vision is the only means of forming and maintaining fish schools. The rest of the passage is a more technical report of how the schools are structured, how individual fish actually behave in forming schools-this is all merely detail and the best way to deal with it is to read attentively, but more quickly than earlier lines.

Question 1.E

This Roman numeral-format question focuses on detail. The stem is asking what the structure of fish schools depends on, and the focus is on the more technical elements in the last half of the passage.

The author states the ideal positions of individual fish aren't maintained rigidly, and this contradicts statement I right away. The idea of random aggregation appears: the school formation results from a probabilistic arrangement that appears like a random aggregation, so the idea is that fish are positioned probabilistic-ally, but not rigidly so.

Statement II is true, repeating the idea in the next sentence that fish school structure is maintained by the preference of fish to have a certain distance from their neighbors.

Statement III is true too. It’s a paraphrase of the last two sentences that each fish uses its vision and lateral line first to measure the speed of the other fish, then to adjust its own speed to conform, based primarily on the position and movements of other fish. So statements I and II are true and (E) is the right choice.

Question 2: C

You know the primary purpose here is to present new ideas that challenge the emphasis of the old theory. So you’re probably safe in assuming that the author’s attitude toward the old idea will be at least somewhat negative. You can therefore cross off choices that sound neutral or positive: (B), (D) and (E).

The negative choices are (A) and (C).(A) is out because it’s much too extreme – the author is not offended or indignant, nor does he argue that vision is insignificant – quite the contrary. This leaves (C) as the best choice. The author disagrees with the old theory since it overlooks the role of the lateral line, but the disagreement is tempered by an acknowledgement that the old theory did recognize the role of vision. So it’s a qualified or measured disagreement – the adjective “considered” works well here.

Question 3:C

Question 3 involves inference, as the word “suggests” in the stem indicates. It refers to the latter, more detailed half of the passage, and that’s where correct answer C is. It’s logically suggested by the last couple of sentences in which you are told that, once it establishes its position, each fish uses its eyes and lateral line to measure the movements of nearby fish in order to maintain appropriate speed and position.

Since the school is moving each fish’s adjustments must be ongoing and continuous,s C states. (A) is wrong because auditory organs aren't mentioned. Lateral lines correspond to a sense of touch, not hearing. (B) and (D) both have words that should strike you as improbably. Nothing suggests that each fish rigorously avoids any disruptive movements, (B), or that the fish would make sudden, unexpected movements only in presence of danger, (D). The idea in (E) also isn't mentioned. It’s never suggested that a fish, once part of a school, completely loses its ability to act on its own.