CAT 2025 Slot 3 · VARC · RC passage 4: Dams: Mega-infrastructure and Sacrifice Zones

The full passage and all 4 questions (Q19–Q22) from CAT 2025 Slot 3, with answers and solutions.

The passage below is accompanied by four questions. Based on the passage, choose the best answer for each question.

Over the course of the twentieth century, humans built, on average, one large dam a day, hulking structures of steel and concrete designed to control flooding, facilitate irrigation, and generate electricity. Dams were also lucrative contracts, large-scale employers, and the physical instantiation of a messianic drive to conquer territories and control nature. Some of the results of that drive were charismatic mega-infrastructure—the Hoover on the Colorado River or the Aswan on the Nile—but most of the tens of thousands of dams that dot the Earth's landscape have drawn little attention. These are the smaller, though not inconsequential, barriers that today impede the flow of water on nearly two-thirds of the world's large waterways. Chances are, what your map calls a "lake" is actually a reservoir, and that thin blue line that emerges from it once flowed very differently.

Damming a river is always a partisan act. Even when explicit infrastructure goals—irrigation, flood control, electrification—were met, other consequences were significant and often deleterious. Across the world, river control displaced millions of people, threatening livelihoods, foodways, and cultures. In the western United States, dams were often an instrument of colonialism, used to dispossess Indigenous people and subsidize settler agriculture. And as dams slowed the flow of water, inhibited the movement of nutrients, and increased the amount of toxic algae and other parasites, they snuffed out entire river ecologies. Declining fish populations are the most evident effect, but dams also threaten a host of other animals—from birds and reptiles to fungi and plants—with extinction. Every major dam, then, is also a sacrifice zone, a place where lives, livelihoods, and ways of life are eliminated so that new sorts of landscapes can support water-intensive agriculture and cities that sprout downstream of new reservoirs.

Such sacrifices have been justified as offerings at the temples of modernity. Justified by—and for—whom, though? Over the course of the twentieth century, rarely were the costs and benefits weighed thoughtfully and decided democratically. As Kader Asmal, chair of the landmark 2000 World Commission on Dams, concluded, "There have been precious few, if any, comprehensive, independent analyses as to why dams came about, how dams perform over time, and whether we are getting a fair return from our $2 trillion investment." A quarter-century later, Asmal's words ring ever truer. A litany of dams built in the mid-twentieth century are approaching the end of their expected lives, with worrying prospects for their durability. Droughts, magnified and multiplied by the effects of climate change, have forced more and more to run below capacity. If ever there were a time to rethink the mania for dams, it would be now.

There is some evidence that a combination of opposition, alternative energy sources, and a lack of viable projects has slowed the construction of major dams. But a wave of recent and ongoing construction, from India and China to Ethiopia and Canada, continues to tilt the global balance firmly in favor of water impoundment.

Question 19 · RC Main Idea and Central Theme

Which one of the following sets of terms is closest to mapping the key arguments of the passage?

  1. A

    Mega-infrastructure – Sacrifice zone – Worshipping modernity – Water impoundment

  2. B

    Partisan act – Threatened livelihoods – Toxic algae – Quarter century

  3. C

    Lucrative contracts – Sacrifice zone – Expected lives – Global balance

  4. D

    Physical instantiation – Partisan act – Decided democratically – Alternative energy

Pick an option, then check.
Answer & solution

Answer: Option A

A set maps the key arguments only if each term carries one of the passage's four movements. Set the movements out: paragraph 1, dams as mega-infrastructure built at extraordinary scale; paragraph 2, every dam a sacrifice zone; paragraph 3, sacrifices justified as 'offerings at the temples of modernity', with the reckoning now overdue; paragraph 4, construction continuing and tilting the global balance toward water impoundment.

Option 1 matches those four in order – mega-infrastructure, sacrifice zone, worshipping modernity, water impoundment. It is the answer.

Option 2 opens well with 'partisan act' and 'threatened livelihoods', but 'toxic algae' is one item in a list of ecological harms and 'quarter century' is a time reference in a quotation's follow-up. Neither is an argument.

Option 3 has 'sacrifice zone', but 'lucrative contracts' and 'expected lives' are passing details, and 'global balance' is only half of the phrase that matters.

Option 4 has two real ideas but also 'decided democratically', which appears inside a statement about what rarely happened, and 'alternative energy', one item in a three-part list about slowed construction.

Shortcut: judge a term set by its weakest member. Each wrong set here contains at least one phrase that is a detail rather than a stage of the argument, and that is enough to reject the whole set at a glance.

Hence, the answer is option 1.

Question 20 · RC Vocabulary in Context

The word "instantiation" is used in the first paragraph. Which one of the following pairs of terms would be the best substitute for it in the context of its usage in the paragraph?
  1. A
    Durability and timeliness
  2. B
    Concreteness and viability
  3. C
    Development and construction
  4. D
    Exemplification and manifestation
Pick an option, then check.
Answer & solution

Answer: Option D

The phrase is that dams were 'the physical instantiation of a messianic drive to conquer territories and control nature'. An instantiation is an instance – the thing in which an abstract drive takes concrete form. So the word must mean something like embodying or exemplifying.

Option 4, exemplification and manifestation, is exactly that: the drive made visible in particular examples. It is the answer.

Option 1, durability and timeliness, has nothing to do with the sense of the word, and durability appears much later in the passage in a different connection.

Option 2 is tempting because 'concreteness' plays off the steel and concrete in the sentence before. But concreteness is a property, not an instance, and 'viability' is unrelated – instantiation says nothing about whether something is workable.

Option 3, development and construction, describes how dams get built. The sentence is not about the building process; it is about what dams represent.

Shortcut: substitute each pair into the sentence and read it aloud. 'The physical exemplification of a messianic drive' works; 'the physical construction of a messianic drive' does not, because a drive cannot be constructed.

Hence, the answer is option 4.

Question 21 · RC Inference Questions

All of the following statements may be considered valid inferences from the passage EXCEPT that:
  1. A
    processes of colonisation have used dam-building to make people vacate their territories.
  2. B
    smaller, though not inconsequential, dams are safer than large dam projects.
  3. C
    despite increasing evidence of opposition to dams as well as alternatives to them, they continue to be built.
  4. D
    dam-building has proved to be an extremely costly enterprise that may not be justifiable.
Pick an option, then check.
Answer & solution

Answer: Option B

Three options are valid; find the one that is not.

Option 1 is valid. Paragraph 2 says that in the western United States dams were 'often an instrument of colonialism, used to dispossess Indigenous people and subsidize settler agriculture'.

Option 3 is valid. Paragraph 4 concedes that opposition and alternative energy sources have slowed major dam construction, 'But a wave of recent and ongoing construction, from India and China to Ethiopia and Canada, continues to tilt the global balance firmly in favor of water impoundment'.

Option 4 is valid. Paragraph 3 cites the $2 trillion investment with 'precious few, if any' independent analyses of whether we are getting a fair return, and notes dams nearing the end of their lives and running below capacity.

Option 2 is not valid. The passage calls the smaller dams 'not inconsequential' and says they impede the flow of water on nearly two-thirds of the world's large waterways. That is a statement of their significance, not of their safety. Nothing in the passage compares the safety of small and large dams.

Shortcut: the option borrows the passage's exact phrase, 'smaller, though not inconsequential', and attaches a claim the phrase does not make. Familiar wording with an unfamiliar predicate is the standard shape of the wrong answer in an inference-EXCEPT question.

Hence, the answer is option 2.

Question 22 · Reading Comprehension

What does the author wish to communicate by referring to the Hoover and Aswan dams in the first paragraph?
  1. A
    The Colorado and Nile rivers may be seen as thin blue lines on a map.
  2. B
    By building dams like the Hoover and Aswan dams, large-scale employers became messianic figures.
  3. C
    The designers and builders of these mega-structures were highly charismatic individuals.
  4. D
    The drive to control nature is evident not only in mega-infrastructures like the Hoover and Aswan dams, but in smaller dams as well.
Pick an option, then check.
Answer & solution

Answer: Option D

Read the sentence structure, which is built on a 'but'. 'Some of the results of that drive were charismatic mega-infrastructure – the Hoover on the Colorado River or the Aswan on the Nile – but most of the tens of thousands of dams that dot the Earth's landscape have drawn little attention.'

The famous dams are named in order to be contrasted with the many unnoticed ones. The point of naming them is that the same drive produced both, and the unnoticed majority matter too – they impede nearly two-thirds of the world's large waterways.

Option 4 states that contrast and is the answer.

Option 1 picks up 'thin blue line' from the paragraph's last sentence, which is about reservoirs and altered flows, not about the Hoover and Aswan.

Option 2 recombines 'large-scale employers' and 'messianic' into a claim the passage does not make. The drive is messianic; the employers are not messianic figures.

Option 3 misreads 'charismatic'. The word describes the mega-infrastructure, not the people who designed or built it.

Shortcut: when examples are introduced before a 'but', their function is to set up the contrast that follows. Choose the option that contains both halves of the contrast; here that is mega-dams and small dams together.

Hence, the answer is option 4.

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