Main Idea Identification MCQs

41

Read the passage: 'Desalination plants provide a vital source of fresh potable water for arid coastal nations lacking rivers or aquifers. Yet, the process consumes vast amounts of fossil fuel energy and produces concentrated toxic brine that, when pumped back into the sea, depletes dissolved oxygen and harms benthic marine life.' What is the main idea?

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A Desalination produces clean water but carries notable energetic and marine environmental drawbacks. B Coastal nations have abandoned desalination in favor of freshwater pipeline imports. C Concentrated brine disposal improves benthic marine biodiversity near coastal outfalls. D Thermal desalination consumes less electrical energy than freshwater river purification.

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42

Read the passage: 'Space debris in low-Earth orbit has grown exponentially, consisting of abandoned rocket boosters, defunctional satellites, and fragmentation fragments. Without proactive removal initiatives, this debris field risks triggering the Kessler syndrome, where collisions cascade into a self-sustaining chain reaction that could render near-Earth space unusable for satellites.' What is the author's main point?

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A Commercial satellites have eliminated the risk of orbital collisions through automated avoidance thrusters. B Accumulating orbital debris threatens the long-term operational viability of near-Earth space unless actively managed. C Rocket boosters are the only source of dangerous debris in low-Earth orbit. D The Kessler syndrome has already rendered all low-Earth orbit orbits permanently impassable.

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43

Read the passage: 'De-extinction technologies, such as somatic-cell cloning and CRISPR gene editing, theoretically offer the ability to resurrect extinct species like the passenger pigeon or woolly mammoth. However, bioethicists warn that reintroducing revived species into altered modern ecosystems could disrupt existing food webs and divert finite funds from protecting currently endangered wildlife.' What is the primary concern raised in the text?

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A Gene editing has made modern wildlife conservation programs completely unnecessary. B De-extinction technology presents significant ecological risks and resource allocation dilemmas despite its scientific ambition. C Woolly mammoths cannot biologically adapt to cold arctic tundra conditions. D Bioethicists universally oppose all forms of laboratory genetic research.

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44

Read the passage: 'Fast fashion relies on rapid production cycles and cheap synthetic textiles to deliver trendy clothing at minimal retail prices. This business model encourages disposable consumer habits, leading to massive textile waste in landfills, toxic dye contamination in waterways, and exploitative factory labor conditions.' What is the central thesis of the text?

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A The fast fashion industry generates severe environmental and social costs through its low-cost, disposable production model. B Synthetic textiles are more durable and environmentally friendly than natural fibers. C Consumer demand for high-end designer apparel has declined due to fast fashion retail chains. D Textile waste can be fully mitigated by recycling garments into industrial insulation.

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45

Read the passage: 'Early childhood language acquisition occurs effortlessly through natural social immersion, whereas adult second-language learners typically rely on explicit grammatical analysis and sustained memorization. Neuroscientists attribute this divergence to a critical developmental window during which synaptic plasticity in language-processing regions remains peak.' What is the main idea?

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A Adults learn second languages more efficiently than children due to analytical skills. B Differences in neurodevelopmental plasticity explain why children acquire language more naturally than adults. C Formal grammatical instruction is the most effective approach for young children. D Language processing areas of the human brain remain completely unchanged across a person's lifespan.

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46

Read the passage: 'Cryptographic encryption safeguards sensitive personal data, e-commerce transactions, and national security communications against unauthorized cyber interception. However, law enforcement agencies argue that unbreakable end-to-end encryption impedes criminal investigations, sparking intense debates between digital privacy advocates and national security officials.' What is the author's primary focus?

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A End-to-end encryption has made conventional law enforcement agencies completely obsolete. B The tension between personal data privacy and law enforcement access creates an ongoing societal controversy over encryption. C Cybercriminals are unable to circumvent basic data encryption protocols. D E-commerce platforms should disable cryptographic security to assist police investigations.

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47

Read the passage: 'Coral reefs occupy less than one percent of the ocean floor, yet they harbor roughly twenty-five percent of all marine species. Rising ocean temperatures trigger mass bleaching events by expelling symbiotic zooxanthellae algae, threatening the collapse of these exceptionally biodiverse marine habitats.' What is the primary message of this passage?

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A Thermal stress threatens coral reefs, which support a disproportionately large share of global marine biodiversity. B Zooxanthellae algae are parasitic organisms that destabilize healthy coral structures. C Coral reefs cover the majority of global continental shelves and ocean floors. D Marine fish species can easily migrate and thrive in deep water if reefs degrade.

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48

Read the passage: 'Proponents of universal basic income (UBI) argue that unconditional cash transfers provide a crucial safety net against automation-driven job loss and alleviate extreme poverty. Conversely, skeptics caution that funding such programs requires prohibitive taxation rates and may disincentivize labor force participation.' What is the main idea of the passage?

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A UBI has been proven to trigger rapid labor market collapse in every trial country. B The debate over UBI centers on its potential to reduce poverty versus concerns regarding fiscal costs and work incentives. C Automation has already eliminated the vast majority of blue-collar industrial jobs worldwide. D Unconditional cash transfers are easier to finance than traditional targeted welfare programs.

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49

Read the passage: 'The human gut microbiome, composed of trillions of symbiotic microorganisms, plays an indispensable role in maintaining systemic health. It aids digestion, synthesizes essential vitamins, trains the adaptive immune system, and communicates bidirectionally with the central nervous system via the gut-brain axis.' What is the central concept discussed?

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A The gut microbiome is exclusively responsible for regulating appetite and caloric intake. B The human gut microbiome fulfills diverse, critical physiological functions that extend beyond simple digestion. C The central nervous system operates independently of digestive biochemical pathways. D Symbiotic microorganisms in the human gut cause chronic immune disorders.

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50

Read the passage: 'Peer review serves as the cornerstone of academic science, evaluating manuscripts for methodological rigor and factual novelty. Nevertheless, it faces growing criticism for potential reviewer bias, slow publication timelines, and an inability to reliably identify fraudulent data or subtle statistical manipulation.' What is the main thesis of the paragraph?

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A The peer review process is flawed and should be eliminated from modern academic publishing. B While foundational to scientific validation, the peer review system faces notable structural and operational limitations. C Statistical manipulation in academic research is consistently detected by anonymous reviewers. D Open-access journals have resolved all publication bottlenecks and reviewer biases.

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