Reading Comprehension — Set 10
Questions 91–100 of 120
Which inference best explains why complex ecosystems are more stable than simple ones?
Correct Answer: B. Complex ecosystems have multiple species performing similar roles providing backup systems
The passage implies that ecosystem complexity provides redundancy. Multiple species filling similar ecological roles ensure that if one species declines, others can maintain ecosystem function, increasing overall stability. Mastering this concept helps in solving grammar-based questions in competitive.
Climate is one of the most fundamental factors shaping the distribution of life on Earth. Temperature ranges, seasonal variation, and precipitation levels collectively determine which organisms can survive and reproduce in any given location. Species that evolved in tropical rainforests cannot tolerate arctic winters, while cold-adapted animals would perish in desert heat. As climate patterns shift, the boundaries of suitable habitat move accordingly, forcing species to migrate, adapt, or face extinction. Scientists studying biodiversity therefore pay close attention to climate data, recognising that climate patterns directly influence where species can survive and thrive. What does the passage suggest about the connection between climate and biodiversity?
Correct Answer: B. Climate patterns directly influence where species can survive and thrive
The passage indicates that climate is fundamental to determining species ranges. Changes in temperature and precipitation patterns directly affect which species can survive in particular regions, shaping biodiversity patterns. Mastering this concept helps in solving grammar-based questions in competitive.
In any ecosystem, food webs are structured by a hierarchy of feeding relationships, with apex predators occupying the highest position. These top predators exert a powerful downward influence on the populations below them, particularly on herbivores that graze on vegetation. When apex predators are removed from an ecosystem, herbivore populations often explode, leading to overgrazing that strips vegetation and degrades habitat for countless other species. By controlling herbivore populations, apex predators prevent overgrazing and ecosystem collapse, a phenomenon ecologists call a trophic cascade. Their presence is therefore essential for maintaining the overall balance and health of the ecological community. Why does the passage likely discuss apex predators in food webs?
Correct Answer: B. Apex predators control herbivore populations, preventing overgrazing and ecosystem collapse
The passage implies that top predators play crucial regulatory roles. By controlling herbivore numbers, apex predators prevent overexploitation of vegetation, maintaining ecological balance throughout the system. Mastering this concept helps in solving grammar-based questions in competitive.
When plants and animals die, their remains do not simply vanish; instead, a community of organisms called decomposers — including bacteria, fungi, and certain invertebrates — breaks down organic matter into simpler chemical compounds. Through this process, nutrients that were locked inside living tissue are released back into the soil, where they become available for uptake by plant roots. Without decomposers, dead organic material would accumulate indefinitely, and essential nutrients would be permanently removed from circulation. Decomposers therefore recycle nutrients, returning them to the soil for plant uptake and completing the nutrient cycle upon which all life depends. This continuous recycling ensures that ecosystems can sustain productivity across generations. What can be inferred about the role of decomposers from the passage?
Correct Answer: B. Decomposers recycle nutrients returning them to soil for plant uptake
The passage suggests that decomposers are essential for nutrient cycling. They break down dead organisms, releasing nutrients back into the soil where plants reabsorb them, creating a continuous cycle. Mastering this concept helps in solving grammar-based questions in competitive.
When a species is introduced to a new region outside its native range, the consequences can be severe for the existing ecological community. Native species have co-evolved over millennia with local competitors, predators, and pathogens, developing a balance that keeps populations in check. An introduced species, however, often arrives free of the natural enemies and competitors that previously limited its numbers, allowing it to reproduce rapidly. Non-native species can outcompete native species, disrupting established ecosystems and driving indigenous populations toward local or global extinction. The problem of invasive species is now recognised as one of the leading causes of biodiversity loss worldwide. Which conclusion best reflects the passage's discussion of invasive species impact?
Correct Answer: B. Non-native species can outcompete native species disrupting established ecosystems
The passage implies that invasive species pose serious ecological threats. Without natural predators or competing species adapted to control them, invasive organisms can proliferate, outcompeting and displacing native species. Mastering this concept helps in solving grammar-based questions in competitive.
The relationship between technological advancement and social inequality is neither straightforward nor inevitable. In societies where access to new technologies is restricted to affluent groups or wealthy nations, technological progress tends to widen existing economic and social gaps. However, when innovations are made widely available — through public infrastructure, affordable devices, or open digital platforms — they can democratise access to education, markets, and services, thereby narrowing disparities. Technology can therefore either reduce or increase inequality depending on access and implementation. Policymakers must thus focus on inclusive deployment strategies rather than assuming that technological progress will automatically benefit all segments of society. What theme emerges from the passage about technology and social inequality?
Correct Answer: B. Technology can either reduce or increase inequality depending on access and implementation
The passage suggests that technology's impact is context-dependent. When access is limited to wealthy groups, technology increases inequality; when widely available, it can reduce disparities. Mastering this concept helps in solving grammar-based questions in competitive.
Earth's natural systems possess a finite capacity to regenerate resources and absorb waste, yet human societies across the globe are drawing on these systems at an unprecedented rate. Forests are cleared faster than they can regrow, fisheries are harvested beyond their sustainable yields, and aquifers are drained more quickly than rainfall can replenish them. This mismatch between the rate of consumption and the rate of natural regeneration means that current patterns exceed Earth's regenerative capacity, creating environmental debt for future generations. The consequences include soil degradation, freshwater shortages, collapsing fisheries, and the progressive loss of natural buffers against climate extremes. Without a fundamental shift in consumption behaviour and economic incentives, these deficits will compound over time. What does the passage imply about the sustainability of current consumption patterns?
Correct Answer: B. Current patterns exceed Earth's regenerative capacity creating environmental debt
The passage indicates that current consumption globally exceeds sustainable levels. Many societies consume resources faster than natural systems can regenerate them, creating long-term environmental and economic vulnerabilities. Mastering this concept helps in solving grammar-based questions in competitive.
One of the most challenging aspects of environmental management is the significant time lag between the initial cause of ecological damage and the moment when its effects become fully visible. Pollutants introduced into an ecosystem today may accumulate slowly in soils, groundwater, or living tissue over many years before triggering measurable harm. Similarly, the disruption of a keystone species through habitat loss may not produce observable declines in dependent populations until decades later. Ecological damage often appears decades after initial harm, making it difficult to draw clear causal connections and easy to dismiss early warning signs. This delay tempts short-term decision-making and can cause society to underestimate the true cost of environmental degradation until remediation has become far more difficult and expensive. Why does the passage emphasize long-term ecological impacts?
Correct Answer: B. Ecological damage often appears decades after initial harm
The passage implies that ecological systems have significant time lags. Damage to ecosystems may not manifest immediately; for.
Ecosystems are not simply collections of species; they are intricate networks in which each organism plays functional roles that contribute to the stability and productivity of the whole. When a species disappears, the functions it performed — pollination, predation, seed dispersal, or nutrient processing — must either be absorbed by remaining species or cease altogether. Losing species reduces ecosystem resilience and function, because the redundancy that allows an ecosystem to absorb shocks is progressively eroded. Genetic diversity is also diminished with each extinction, narrowing the pool of adaptations available to populations facing future environmental challenges. A species-poor ecosystem is therefore more fragile, less productive, and less capable of recovering from disturbance than a biodiverse one. What inference can be made about biodiversity loss from the passage?
Correct Answer: B. Losing species reduces ecosystem resilience and function
The passage suggests that each species loss reduces ecosystem capacity to adapt. Loss of genetic diversity and functional redundancy makes ecosystems more vulnerable to further disturbances and environmental changes. Mastering this concept helps in solving grammar-based questions in competitive.
For much of the twentieth century, economic development and environmental conservation were viewed as opposing goals, with growth possible only at the expense of natural systems. More recent thinking challenges this dichotomy, arguing that long-term prosperity depends on maintaining the ecological foundations — clean water, fertile soils, stable climate — that underpin all economic activity. Sustainable development integrates economic needs with environmental protection, seeking approaches that generate livelihoods and material well-being without permanently depleting the natural capital on which future generations will depend. Green infrastructure, resource-efficient manufacturing, and renewable energy systems illustrate how development trajectories can be redesigned to minimise ecological costs. Far from being incompatible, development and conservation are increasingly seen as complementary goals within a well-designed policy framework. How does the passage suggest societies can balance development with conservation?
Correct Answer: B. Sustainable development integrates economic needs with environmental protection
The passage implies that thoughtful planning can reconcile growth with environmental stewardship. Sustainable practices maximize benefits while minimizing ecological costs, enabling long-term prosperity. Mastering this concept helps in solving grammar-based questions in competitive.