Reading Comprehension — Set 1
Questions 1–10 of 120
Scientists have long studied the factors driving the rapid rise in global temperatures observed over the past century. Among the many variables examined, greenhouse gases emitted from human activities have been identified as the primary cause of global warming. These gases, including carbon dioxide and methane, accumulate in the atmosphere and trap heat that would otherwise escape into space, causing temperatures worldwide to climb steadily. While natural phenomena such as volcanic eruptions and variations in solar radiation do influence Earth's climate, their contributions are considered far smaller compared to the impact of human-generated emissions. Addressing this root cause is therefore central to any meaningful effort to slow the pace of climate change. According to the passage, what is the primary cause of global warming mentioned?
Correct Answer: B. Greenhouse gases from human activities
The passage explicitly states that greenhouse gases emitted from human activities are the primary cause of global warming. These gases trap heat in the atmosphere, leading to increased temperatures worldwide. Mastering this concept helps in solving grammar-based questions in competitive.
The scientific community has reached a remarkable level of agreement on the subject of climate change. Survey after survey of peer-reviewed research and practising climate scientists confirms that 97% of climate scientists agree that climate change is real and is caused primarily by human activities. This near-unanimous consensus is built on decades of observational data, atmospheric measurements, and climate modelling. The remaining small fraction of researchers who dispute this conclusion represent a minority view that has not gained acceptance in mainstream scientific literature. Understanding this overwhelming consensus is important for evaluating policy discussions around emissions reduction and environmental protection. What percentage of scientists agree on climate change according to the passage?
Correct Answer: C. 97%
The passage mentions that 97% of climate scientists agree that climate change is real and caused primarily by human activities. This overwhelming consensus represents the scientific community's position. Mastering this concept helps in solving grammar-based questions in competitive.
Climate change is already producing wide-ranging consequences across the planet. Scientists have documented rising sea levels as polar ice melts and ocean water expands with increasing warmth. The frequency and severity of extreme weather events such as hurricanes, droughts, and heatwaves have also been shown to increase as the climate shifts. Biodiversity loss is another serious effect, as many species struggle to adapt to rapidly changing habitats and face a heightened risk of extinction. These interconnected impacts pose significant challenges for ecosystems and human communities alike, requiring urgent action on multiple fronts. Which of the following is NOT mentioned as an effect of climate change in the passage?
Correct Answer: D. Decreased atmospheric oxygen
The passage discusses rising sea levels, extreme weather events, and biodiversity loss as effects of climate change. However, decreased atmospheric oxygen is not mentioned as a direct effect in the passage. Mastering this concept helps in solving grammar-based questions in competitive.
To illustrate how dramatically Earth's temperature has changed, researchers often analyse records spanning the last 150 years. This period coincides with the onset of industrialisation and the widespread burning of fossil fuels, which are considered the primary drivers of observed warming. Data collected from weather stations, ocean buoys, and ice cores all point to a consistent and accelerating rise in average global temperatures over this timeframe. The trend is particularly sharp in recent decades, with each successive decade typically recording higher temperatures than the one before. Understanding this historical pattern is essential for predicting future climate scenarios and designing effective mitigation strategies. What time period does the passage use to illustrate the temperature increase?
Correct Answer: C. Last 150 years
The passage references temperature data from the last 150 years to demonstrate the dramatic increase in global temperatures. This timeframe aligns with industrialization and increased fossil fuel consumption. Mastering this concept helps in solving grammar-based questions in competitive.
Greenhouse gas emissions originate from many sources, but certain sectors contribute disproportionately to the overall total. The industrial and transportation sectors are among the largest sources of these emissions, as both rely heavily on the combustion of fossil fuels such as coal, oil, and natural gas. Factories release large quantities of carbon dioxide and other gases during manufacturing processes, while vehicles, ships, and aircraft emit significant amounts of exhaust during daily operation. Natural processes such as volcanic activity and animal respiration also release gases into the atmosphere, but these contributions are dwarfed by those from industrial and transport activities. Reducing emissions from these two sectors is therefore a priority in most national and international climate plans. According to the passage, what is one major source of greenhouse gas emissions?
Correct Answer: B. Industrial and transportation sectors
The passage identifies the industrial and transportation sectors as major sources of greenhouse gas emissions. These sectors rely heavily on fossil fuel combustion, which releases significant amounts of CO2 and other gases. Mastering this concept helps in solving grammar-based questions in competitive.
The water cycle is a continuous process through which water moves through the environment in a series of linked stages. The cycle begins with evaporation, in which water from oceans, lakes, and rivers is heated by the sun and converts into water vapor that rises into the atmosphere. As this vapor ascends and cools, it undergoes condensation, forming clouds and eventually falling back to the surface as precipitation in the form of rain or snow. Some of this water flows over the land as runoff, while the rest seeps into the ground through infiltration. Together these stages ensure a constant circulation of water that sustains life on Earth. What is the first stage of the water cycle as described in the passage?
Correct Answer: B. Evaporation
The passage begins by explaining evaporation, where water from oceans, lakes, and rivers is heated by the sun and turns into water vapor. This is identified as the initial stage of the water cycle. Mastering this concept helps in solving grammar-based questions in competitive.
Earth's total water supply is vast, but it is distributed very unevenly among different reservoirs. Approximately 97% of Earth's total water is stored in the oceans, making them by far the largest component of the global water system. The remaining three percent is classified as freshwater, most of which is locked in glaciers, ice caps, and underground aquifers. Only a tiny fraction of all freshwater is readily accessible in lakes, rivers, and the atmosphere. Because the oceans hold such an enormous share of total water, they serve as the primary reservoir that drives the water cycle through evaporation. How much of Earth's water is stored in the oceans according to the passage?
Correct Answer: D. 97%
The passage states that approximately 97% of Earth's total water is stored in the oceans. This makes oceans the primary source of water for the continuous water cycle. Mastering this concept helps in solving grammar-based questions in competitive.
In the water cycle, what process occurs when water vapor rises and cools?
Correct Answer: C. Condensation
The passage explains that condensation occurs when water vapor rises into the atmosphere and encounters cooler temperatures, forming clouds. This process is essential for cloud formation in the water cycle. Mastering this concept helps in solving grammar-based questions in competitive.
Plants play a vital and often underappreciated role in the water cycle. Through a process called transpiration, plants absorb water from the soil through their roots and release it as water vapor through tiny pores in their leaves. This contributes meaningful amounts of moisture to the atmosphere, particularly in heavily vegetated regions such as tropical rainforests. Some estimates suggest that transpiration accounts for a significant portion of the water vapor that eventually forms clouds and precipitation. Because of this function, the health of plant communities directly influences local and regional rainfall patterns and overall climate stability. What does the passage identify as the role of plants in the water cycle?
Correct Answer: B. They release water vapor through transpiration
The passage mentions that plants contribute to the water cycle through transpiration, releasing water vapor into the atmosphere. This is particularly important in vegetated regions and tropical areas. Mastering this concept helps in solving grammar-based questions in competitive.
Freshwater is an essential resource, and understanding where it comes from helps explain why its availability can vary so greatly across different regions. Precipitation from clouds is the primary source of freshwater on Earth, delivering rain and snow that directly replenishes rivers, lakes, and underground water tables. When precipitation falls on land, some of it flows into surface water bodies while the rest infiltrates the soil to recharge groundwater reserves. Glaciers and ice caps store large amounts of frozen freshwater, but they release it slowly over long time periods and are not a reliable everyday supply. In contrast, regular rainfall and snowmelt driven by the water cycle continuously renew accessible freshwater resources. According to the passage, where does most freshwater on Earth originate?
Correct Answer: C. Precipitation from clouds
The passage indicates that precipitation is the primary source of freshwater on Earth. When water vapor condenses and falls as rain or snow, it replenishes freshwater supplies in lakes, rivers, and groundwater. Mastering this concept helps in solving grammar-based questions in competitive.