Reading comprehension II: central idea, author's view, purpose and passage-based facts: previous-year questions
263 real UPSC Prelims questions (2011–2026) with the official answer and a clear explanation. 71 of them came in the last five papers.
How often UPSC asks this
Questions per year, counted from the official papers.
Attempt the questions
Newest papers first. Tap an option; the answer and the reason appear instantly.
Read the passage
“...... most people would agree that telling deliberate lies is wrong, except perhaps in certain special situations where more harm will be done by telling the truth. Even the most truthful people probably tell a good many more lies that might be regarded as semantic lies; their use of words contains some measure of falsehood, more or less deliberate.”
The idea which the first part of the passage mentions is
Answer (d) & explanation
UPSC's key gives (d): disagreement about the harm in telling the truth. Step 1: the first part says most people agree deliberate lies are wrong, "except perhaps in certain special situations where more harm will be done by telling the truth". Step 2: UPSC reads the key idea as this exception: people differ on when telling the truth does harm. That is (d). Step 3: option (a), agreement about telling lies, also looks close because of "most people would agree". But UPSC picked the exception as the idea. Options (b) and (c) do not match the wording.
Tip: in short quotes, UPSC often tests the qualifier ("except", "unless"). The exception usually carries the idea being examined.
Answer as per the official UPSC answer key.
Read the passage
Many people understand the connection between solid waste management and health in terms of the consequences of unattended heaps of dry garbage which become home for flies and other vermin. However, there is another aspect that is not well-understood, that is, what happens when unscientific solid waste management combines with poor drainage and dumping of untreated sewage into drains which are meant to carry storm water during rains. The result is choked drains which are full of stagnant water breeding mosquitoes, resulting in the spread of water-borne diseases.
In the context of India, which one of the following statements best reflects the critical message of the passage?
Answer (c) & explanation
The message is that solid waste management must be integrated with drainage and sewerage upkeep (c). Step 1: the passage says disease spreads when poor waste handling "combines with poor drainage" and sewage. So these must be managed together. That is (c). Step 2: option (a), drains not separated for sewage and storm water, is only a detail. Step 3: option (b), local bodies lack money and power, is not the main point. Option (d), drinking water shortage, is not discussed.
Tip: the message usually ties the passage's facts together. Here every fact links waste and drainage. Swachh Bharat Mission (Urban) 2.0 covers both solid waste and used-water management.
Answer as per the official UPSC answer key.
Read the passage
Our urban bodies cannot possibly ensure sustainable delivery of water in our cities unless financing mechanisms are put in place. Water delivery requires heavy investment in collecting it from a natural source, treating it to make it potable, and laying a distribution network of pipes for delivery to the users. It also requires investments in sewerage infrastructure and sewage treatment plants so that the sewers can carry the wastewater to these plants to ensure that no untreated sewage is discharged back into natural water bodies. If our cities were rich enough to meet the entire cost, water could be delivered free. They are not.
What is the most logical and crucial message conveyed by the passage?
Answer (a) & explanation
The message is that urban local bodies must recover costs through user charges (a). Step 1: the passage says water delivery needs heavy investment, and cities cannot meet "the entire cost" themselves. So water cannot be free; users must pay. That is (a). Step 2: option (b), that local bodies are inefficient, is not raised. Option (d), capping city population, is also not raised. Step 3: option (c) says the shortage cannot be solved. That is defeatist; the passage offers a way, user charges.
Tip: when a passage stresses cost, the message usually concerns who pays. Choose the option that offers the passage's own solution, not an extreme one.
Answer as per the official UPSC answer key.
Read the passage
Our urban bodies cannot possibly ensure sustainable delivery of water in our cities unless financing mechanisms are put in place. Water delivery requires heavy investment in collecting it from a natural source, treating it to make it potable, and laying a distribution network of pipes for delivery to the users. It also requires investments in sewerage infrastructure and sewage treatment plants so that the sewers can carry the wastewater to these plants to ensure that no untreated sewage is discharged back into natural water bodies. If our cities were rich enough to meet the entire cost, water could be delivered free. They are not.
With reference to the above passage, the following assumptions have been made :
- 1. Rich cities only can ensure sustainable delivery of water.
- 2. Sustainable delivery of water in cities means much more than supplying water to households.
Which of the above assumptions is/are valid?
Answer (b) & explanation
Only assumption 2 is valid (b). Step 1: the passage says water delivery includes treatment, pipes, sewers and sewage plants. So sustainable delivery means much more than supplying water to homes (2). Step 2: assumption 1 says only rich cities can do this. But the passage says poorer cities can also deliver with "financing mechanisms". So 1 fails. Step 3: so options (a), (c) and (d) fail.
Tip: "only" claims fail if the passage shows another way. India's AMRUT 2.0 mission funds water supply and sewerage in cities that cannot pay alone.
Answer as per the official UPSC answer key.
Read the passage
Spanish ships in the late 16th century first brought the potato tuber from South America to Europe whereby in the early 19th century, it had become a reliable backup to cereal crops, particularly in the cold, rain-soaked soils of Ireland. The Irish were soon almost wholly dependent on the potato as their staple food. And they were planting primarily one prodigious variety, the ‘Lumper’ potato, whose genetic frailty would be cruelly exposed by the fungus ‘Phytophthora infestans’. In 1845, spores of the deadly fungus began spreading across the country, destroying nearly all the Lumpers in its path. The resulting famine killed or displaced millions.
Which one of the following statements best reflects the critical message of the passage?
Answer (d) & explanation
The critical message is that relying on one uniform food source is unwise (d). Step 1: the passage says the Irish depended almost wholly on one potato variety, and one fungus wiped it out, causing famine. So depending on a single, uniform food is risky. That is (d). Step 2: option (a), suitable soil and climate, misses the point; the potato grew well in Ireland. Step 3: option (c), some fungal infections cannot be stopped, is too general. Option (b), tubers cannot replace cereals, is not the message.
Tip: this is the Irish Potato Famine of the 1840s. It is the classic warning against monoculture and a reason to keep crop diversity.
Answer as per the official UPSC answer key.
Read the passage
Political theorists no doubt have to take history of injustice, for example, untouchability, seriously. The concept of historical injustice takes note of a variety of historical wrongs that continue into the present in some form or the other and tend to resist repair. Two reasons might account for resistance to repair. One, not only are the roots of injustice buried deep in history, injustice itself constitutes economic structures of exploitation, ideologies of discrimination and modes of representation. Two, the category of historical injustice generally extends across a number of wrongs such as economic deprivation, social discrimination and lack of recognition. This category is complex, not only because of the overlap between a number of wrongs, but because one or the other wrong, generally discrimination, tends to acquire partial autonomy from others. This is borne out by the history of repair in India.
What is the main idea that we can infer from the passage ?
Answer (d) & explanation
The main idea is that it is hard, if not impossible, to repair every form of historical injustice (d). Step 1: the passage says historical wrongs "tend to resist repair" because they are deep-rooted and overlap with one another. That matches (d). Step 2: option (b) says injustice is inevitable and always beyond repair. "Tend to resist" is softer than "always", so (b) overstates. Step 3: option (a) fails because the passage says theorists "have to take" untouchability seriously; it does not say they ignored it. Option (c) blames bad economies, which the passage never says.
Tip: match the strength of the option to the passage. "Tend to" fits "difficult", not "always" or "never".
Answer as per the official UPSC answer key.
Read the passage
Political theorists no doubt have to take history of injustice, for example, untouchability, seriously. The concept of historical injustice takes note of a variety of historical wrongs that continue into the present in some form or the other and tend to resist repair. Two reasons might account for resistance to repair. One, not only are the roots of injustice buried deep in history, injustice itself constitutes economic structures of exploitation, ideologies of discrimination and modes of representation. Two, the category of historical injustice generally extends across a number of wrongs such as economic deprivation, social discrimination and lack of recognition. This category is complex, not only because of the overlap between a number of wrongs, but because one or the other wrong, generally discrimination, tends to acquire partial autonomy from others. This is borne out by the history of repair in India.
On the basis of the above passage, the following assumptions have been made :
- 1. Removal of economic discrimination leads to removal of social discrimination.
- 2. Democratic polity is the best way to repair historical wrongs.
Which of the above assumptions is/are valid ?
Answer (d) & explanation
Neither assumption is valid (d). Step 1: the passage says discrimination gains "partial autonomy" from other wrongs. That means it can live on by itself. So removing economic discrimination need not remove social discrimination. Assumption 1 fails. Step 2: assumption 2 calls democracy the best way to repair historical wrongs. The passage never mentions democracy. So 2 fails. Step 3: so options (a), (b) and (c) fail.
Tip: "partial autonomy" is a key phrase: it means one problem does not simply depend on another. When an option brings in a new idea, like democracy, that the passage never raised, it cannot be a valid assumption.
Answer as per the official UPSC answer key.
Read the passage
A majority of the TB infected in India are poor and lack sufficient nutrition, suitable housing and have little understanding of prevention. TB then devastates families, makes the poor poorer, particularly affects women and children, and leads to ostracisation and loss of employment. The truth is that even if TB does not kill them, hunger and poverty will. Another truth is that deep-seated stigma, lack of counselling, expensive treatment and lack of adequate support from providers and family, coupled with torturous side-effects demotivate patients to continue treatment — with disastrous health consequences.
Which one of the following is the most logical, rational and crucial message conveyed by the above passage ?
Answer (b) & explanation
The message is that curing TB needs more than diagnosis and medicine (b). Step 1: the passage says nutrition, stigma, counselling and family support all decide whether patients finish their treatment. So medicine alone is not enough. That is (b). Step 2: option (a) says TB is not curable in India. That is extreme; TB is curable with full treatment. Step 3: option (c) blames surveillance, which the passage does not discuss. Option (d) says India will be free of TB only when poverty schemes succeed; "only when" overstates.
Tip: India runs the Ni-kshay Poshan Yojana, which gives TB patients money for nutrition, for exactly this reason. In CSAT, pick the balanced option and drop the extreme ones.
Answer as per the official UPSC answer key.
Read the passage
What stands in the way of the widespread and careful adoption of ‘Genetic Modification (GM)’ technology is an ‘Intellectual Property Rights’ regime that seeks to create private monopolies for such technologies. If GM technology is largely corporate driven, it seeks to maximize profits and that too in the short run. That is why corporations make major investments for herbicide-tolerant and pest-resistant crops. Such properties have only a short window, as soon enough, pests and weeds will evolve to overcome such resistance. This suits the corporations. The National Farmers Commission pointed out that priority must be given in genetic modification to the incorporation of genes that can help impart resistance to drought, salinity and other stresses.
Which one of the following is the most logical, rational and crucial message conveyed by the above passage ?
Answer (a) & explanation
The message is that public research institutions should lead GM technology and set its agenda (a). Step 1: the passage says corporate GM research chases short-term profit. It ignores farmers' real needs, like crops that resist drought or salinity. So public bodies should set the agenda. That is (a). Step 2: option (b), abolishing intellectual property rights, is extreme. Option (c), banning private firms from seed business, is also extreme. Step 3: option (d) says India should not grow GM crops at all. The passage wants GM used better, not dropped.
Tip: if a passage criticises who controls a technology, the answer usually shifts control, not bans the technology. In India, ICAR and state agricultural universities do such public research.
Answer as per the official UPSC answer key.
Read the passage
What stands in the way of the widespread and careful adoption of ‘Genetic Modification (GM)’ technology is an ‘Intellectual Property Rights’ regime that seeks to create private monopolies for such technologies. If GM technology is largely corporate driven, it seeks to maximize profits and that too in the short run. That is why corporations make major investments for herbicide-tolerant and pest-resistant crops. Such properties have only a short window, as soon enough, pests and weeds will evolve to overcome such resistance. This suits the corporations. The National Farmers Commission pointed out that priority must be given in genetic modification to the incorporation of genes that can help impart resistance to drought, salinity and other stresses.
On the basis of the above passage, the following assumptions have been made :
- 1. The issue of effects of natural calamities on agriculture is not given due consideration by GM technology companies.
- 2. In the long run, GM technology will not be able to solve agricultural problems arising due to global warming.
Which of the above assumptions is/are valid ?
Answer (a) & explanation
Only assumption 1 is valid (a). Step 1: the passage says GM companies invest in herbicide and pest traits. Traits for drought and salinity, which matter for natural calamities, are left for a Commission to urge. So companies neglect this issue. Assumption 1 holds. Step 2: assumption 2 says GM will not solve climate-related farm problems in the long run. But the passage wants GM to be used for these stresses, so it believes GM can help. Assumption 2 contradicts the passage. Step 3: options (b), (c) and (d) fail.
Tip: an assumption that goes against the author's hope cannot be valid. Check whether the passage sees a tool as useless or just badly used.
Answer as per the official UPSC answer key.
Read the passage
The interests of working and poor people have historically been neglected in the planning of our cities. Our cities are increasingly intolerant, unsafe and unlivable places for large numbers of citizens and yet we continue to plan via the old ways — the static Development Plan — that draws exclusively from technical expertise, distanced from people’s live experiences and needs, and actively excluding large number of people, places, activities and practices that are an integral part of the city.
The passage seems to argue
Answer (d) & explanation
The passage argues for people's groups taking part in city planning (d). Step 1: it says the flaw is planning "exclusively from technical expertise, distanced from people's lived experiences". The fix is to involve people. That is (d). Step 2: option (c) wants cities planned mainly for the poor. That would just swap one exclusion for another; the passage wants everyone included. Step 3: option (a), against builders and elites, and option (b), against smart cities, are not the passage's argument; it does not oppose these outright.
Tip: when a passage names a flaw ("exclusively experts"), the answer is the opposite: inclusion. India's 74th Amendment (1992) set up ward committees to give citizens a say.
Answer as per the official UPSC answer key.
Read the passage
It is no longer enough for us to talk about providing for universal access to education. Making available schooling facilities is an essential prerequisite, but is insufficient to ensure that all children attend school and participate in the learning process. The school may be there, but children may not attend or they may drop out after a few months. Through school and social mapping, we must address the entire gamut of social, economic, cultural and indeed linguistic and pedagogic issues, factors that prevent children from weaker sections and disadvantaged groups, as also girls, from regularly attending and complementing elementary education. The focus must be on the poorest and most vulnerable since these groups are the most disempowered and at the greatest risk of violation or denial of their right to education.
The right to education goes beyond free and compulsory education to include quality education for all. Quality is an integral part of the right to education. If the education process lacks quality, children are being denied their right. The Right of Children to Free and Compulsory Education Act lays down that the curriculum should provide for learning through activities, exploration and discovery. This places an obligation on us to change our perception of children as passive receivers of knowledge, and to move beyond the convention of using textbooks as the basis of examinations. The teaching-learning process must become stress-free; and a massive programme for curricular reform should be initiated to provide for a child-friendly learning system, that is more relevant and empowering. Teacher accountability systems and processes must ensure that children are learning, and that their right to learn in a child-friendly environment is not violated. Testing and assessment systems must be reexamined and redesigned to ensure that these do not force children to struggle between school and tuition centres, and bypass childhood.
According to the passage, which one of the following is critical in bringing quality in education?
Answer (d) & explanation
Learning through activities and discovery is critical for quality (d). Step 1: in the paragraph on quality, the passage says the curriculum should provide "learning through activities, exploration and discovery". That is option (d). Step 2: option (c), understanding children's social background, appears in the paragraph on access, not quality. Step 3: option (a), regular attendance, and option (b), money for teachers, are not called critical for quality.
Tip: in long passages, notice which paragraph covers which topic. Options often take a correct phrase from the wrong paragraph. Matching the question's key word, here "quality", to the right paragraph avoids that trap.
Answer as per the official UPSC answer key.
Read the passage
A male tiger was removed from Pench Tiger Reserve and was relocated in Panna National Park. Later, this tiger trekked toward his home 250 miles away. The trek of this solitary tiger highlights a crisis. Many wildlife reserves exist as islands of fragile habitat in a vast sea of humanity, yet tigers can range over a hundred miles, seeking prey, mates and territory. Nearly a third of India’s tigers live outside tiger reserves, a situation that is dangerous for both human and animal. Prey and tigers can only disperse if there are recognized corridors of land between protected areas to allow unmolested passage.
Which of the following is the most rational and crucial message given by the passage?
Answer (b) & explanation
The message is that safe wildlife corridors are essential for conservation (b). Step 1: the passage calls reserves "islands of fragile habitat" and says tigers "can only disperse if there are recognized corridors". So linking reserves is the key point. That is (b). Step 2: option (c) asks for more reserves. The passage wants links between reserves, not more islands. Step 3: option (a) says conflict cannot be resolved; that is defeatist and not the author's view. Option (d), professional management, is not discussed.
Tip: an author's repeated image ("islands") often signals the problem; the fix they name is the message. India's tiger corridors, such as those linking Kanha and Pench, follow this idea.
Answer as per the official UPSC answer key.
Read the passage
It is no longer enough for us to talk about providing for universal access to education. Making available schooling facilities is an essential prerequisite, but is insufficient to ensure that all children attend school and participate in the learning process. The school may be there, but children may not attend or they may drop out after a few months. Through school and social mapping, we must address the entire gamut of social, economic, cultural and indeed linguistic and pedagogic issues, factors that prevent children from weaker sections and disadvantaged groups, as also girls, from regularly attending and complementing elementary education. The focus must be on the poorest and most vulnerable since these groups are the most disempowered and at the greatest risk of violation or denial of their right to education.
The right to education goes beyond free and compulsory education to include quality education for all. Quality is an integral part of the right to education. If the education process lacks quality, children are being denied their right. The Right of Children to Free and Compulsory Education Act lays down that the curriculum should provide for learning through activities, exploration and discovery. This places an obligation on us to change our perception of children as passive receivers of knowledge, and to move beyond the convention of using textbooks as the basis of examinations. The teaching-learning process must become stress-free; and a massive programme for curricular reform should be initiated to provide for a child-friendly learning system, that is more relevant and empowering. Teacher accountability systems and processes must ensure that children are learning, and that their right to learn in a child-friendly environment is not violated. Testing and assessment systems must be reexamined and redesigned to ensure that these do not force children to struggle between school and tuition centres, and bypass childhood.
What is the essential message in this passage?
Answer (c) & explanation
The message is that the Right to Free and Compulsory Education should include quality education for all (c). Step 1: the passage says "the right to education goes beyond free and compulsory education to include quality education for all". That is option (c). Step 2: option (a), that education is now a Fundamental Right, is true (Article 21A), but it is outside knowledge, not the passage's message. Step 3: options (b) and (d) cover only access, getting children into school, and miss quality.
Tip: an answer can be true in real life and still be wrong for a passage question. The essential message must come from the passage itself.
Answer as per the official UPSC answer key.
Read the passage
A male tiger was removed from Pench Tiger Reserve and was relocated in Panna National Park. Later, this tiger trekked toward his home 250 miles away. The trek of this solitary tiger highlights a crisis. Many wildlife reserves exist as islands of fragile habitat in a vast sea of humanity, yet tigers can range over a hundred miles, seeking prey, mates and territory. Nearly a third of India’s tigers live outside tiger reserves, a situation that is dangerous for both human and animal. Prey and tigers can only disperse if there are recognized corridors of land between protected areas to allow unmolested passage.
With reference to the above passage, the following assumptions have been made :
- 1. The strategy of conservation of wildlife by relocating them from one protected area to another is not often successful.
- 2. India does not have suitable legislation to save the tigers, and its conservation efforts have failed which forced the tigers to live outside protected areas.
Which of the above assumptions is/are valid?
Answer (a) & explanation
Only assumption 1 is valid (a). Step 1: the passage tells of a relocated tiger who "trekked toward his home 250 miles away". UPSC's key reads this as showing that relocation often does not work, since animals try to return. So 1 holds. Step 2: assumption 2 says India lacks suitable laws and its efforts have failed. The passage never discusses legislation. India in fact has the Wild Life (Protection) Act, 1972 and Project Tiger. So 2 fails. Step 3: options (b), (c) and (d) fail.
Tip: an assumption must rest on something in the passage. A claim about laws, money or failure that the passage never mentions is not valid, however plausible it sounds.
Answer as per the official UPSC answer key.
Read the passage
‘Desertification’ is a term used to explain a process of decline in the biological productivity of an ecosystem, leading to total loss of productivity. While this phenomenon is often linked to the arid, semi-arid and sub-humid ecosystems, even in the humid tropics, the impact could be most dramatic. Impoverishment of human-impacted terrestrial ecosystems may exhibit itself in a variety of ways : accelerated erosion as in the mountain regions of the country, salinization of land as in the semi-arid and arid ‘green revolution’ areas of the country, e.g., Haryana and western Uttar Pradesh, and site quality decline—a common phenomenon due to general decline in tree cover and monotonous monoculture of rice/wheat across the Indian plains. A major consequence of deforestation is that it relates to adverse alterations in the hydrology and related soil and nutrient losses. The consequences of deforestation invariably arise out of site degradation through erosive losses. Tropical Asia, Africa and South America have the highest levels of erosion. The already high rates for the tropics are increasing at an alarming rate (e.g., through the major river systems—Ganga and Brahmaputra, in the Indian context), due to deforestation and ill-suited land management practices subsequent to forest clearing. In the mountain context, the declining moisture retention of the mountain soils, drying up of the underground springs and smaller rivers in the Himalayan region could be attributed to drastic changes in the forest cover. An indirect consequence is drastic alteration in the upland-lowland interaction, mediated through water. The current concern the tea planter of Assam has is about the damage to tea plantations due to frequent inundation along the flood-plains of Brahmaputra, and the damage to tea plantation and the consequent loss in tea productivity is due to rising level of the river bottom because of siltation and the changing course of the river system. The ultimate consequences of site desertification are soil degradation, alteration in available water and its quality, and the consequent decline in food, fodder and fuel-wood yields essential for the economic well-being of rural communities.
According to the passage, which of the following are the consequences of decline in forest cover?
- 1. Loss of topsoil
- 2. Loss of smaller rivers
- 3. Adverse effect on agricultural production
- 4. Declining of groundwater
Select the correct answer using the code given below.
Answer (d) & explanation
All four are consequences of falling forest cover (d). Step 1: the passage lists erosive soil losses, which means loss of topsoil. So statement 1 holds. Step 2: it mentions "drying up of the underground springs and smaller rivers". That covers the loss of smaller rivers (2) and falling groundwater (4). Step 3: it also mentions falling food and fodder yields, an effect on farm output (3). So all four are right. Options (a), (b) and (c) each leave out at least one stated effect.
Tip: one sentence in a passage can support two statements, as "springs and smaller rivers" does here. Tick every statement the passage backs, even if they come from the same line.
Answer as per the official UPSC answer key.
Read the passage
‘Desertification’ is a term used to explain a process of decline in the biological productivity of an ecosystem, leading to total loss of productivity. While this phenomenon is often linked to the arid, semi-arid and sub-humid ecosystems, even in the humid tropics, the impact could be most dramatic. Impoverishment of human-impacted terrestrial ecosystems may exhibit itself in a variety of ways : accelerated erosion as in the mountain regions of the country, salinization of land as in the semi-arid and arid ‘green revolution’ areas of the country, e.g., Haryana and western Uttar Pradesh, and site quality decline—a common phenomenon due to general decline in tree cover and monotonous monoculture of rice/wheat across the Indian plains. A major consequence of deforestation is that it relates to adverse alterations in the hydrology and related soil and nutrient losses. The consequences of deforestation invariably arise out of site degradation through erosive losses. Tropical Asia, Africa and South America have the highest levels of erosion. The already high rates for the tropics are increasing at an alarming rate (e.g., through the major river systems—Ganga and Brahmaputra, in the Indian context), due to deforestation and ill-suited land management practices subsequent to forest clearing. In the mountain context, the declining moisture retention of the mountain soils, drying up of the underground springs and smaller rivers in the Himalayan region could be attributed to drastic changes in the forest cover. An indirect consequence is drastic alteration in the upland-lowland interaction, mediated through water. The current concern the tea planter of Assam has is about the damage to tea plantations due to frequent inundation along the flood-plains of Brahmaputra, and the damage to tea plantation and the consequent loss in tea productivity is due to rising level of the river bottom because of siltation and the changing course of the river system. The ultimate consequences of site desertification are soil degradation, alteration in available water and its quality, and the consequent decline in food, fodder and fuel-wood yields essential for the economic well-being of rural communities.
Which of the following is/are the correct inference/inferences that can be made from the passage?
- 1. Deforestation can cause changes in the course of rivers.
- 2. Salinization of land takes place due to human activities only.
- 3. Intense monoculture practice in plains is a major reason for desertification in Tropical Asia, Africa and South America.
Select the correct answer using the code given below.
Answer (a) & explanation
Only inference 1 is correct (a). Step 1: the passage says deforestation causes siltation and "the changing course of the river system". So deforestation can change a river's course. Inference 1 holds. Step 2: inference 2 says salinisation happens due to human activity only. The passage does not say "only", and natural causes also exist. So 2 fails. Step 3: inference 3 links heavy monoculture in plains to desertification in Asia, Africa and South America. But the passage ties monoculture to Indian plains, not other continents. So 3 fails, and options (b), (c) and (d) fail.
Tip: check that a statement keeps the passage's place and scope. Moving a point to a new region makes it unsupported.
Answer as per the official UPSC answer key.
Read the passage
‘Desertification’ is a term used to explain a process of decline in the biological productivity of an ecosystem, leading to total loss of productivity. While this phenomenon is often linked to the arid, semi-arid and sub-humid ecosystems, even in the humid tropics, the impact could be most dramatic. Impoverishment of human-impacted terrestrial ecosystems may exhibit itself in a variety of ways : accelerated erosion as in the mountain regions of the country, salinization of land as in the semi-arid and arid ‘green revolution’ areas of the country, e.g., Haryana and western Uttar Pradesh, and site quality decline—a common phenomenon due to general decline in tree cover and monotonous monoculture of rice/wheat across the Indian plains. A major consequence of deforestation is that it relates to adverse alterations in the hydrology and related soil and nutrient losses. The consequences of deforestation invariably arise out of site degradation through erosive losses. Tropical Asia, Africa and South America have the highest levels of erosion. The already high rates for the tropics are increasing at an alarming rate (e.g., through the major river systems—Ganga and Brahmaputra, in the Indian context), due to deforestation and ill-suited land management practices subsequent to forest clearing. In the mountain context, the declining moisture retention of the mountain soils, drying up of the underground springs and smaller rivers in the Himalayan region could be attributed to drastic changes in the forest cover. An indirect consequence is drastic alteration in the upland-lowland interaction, mediated through water. The current concern the tea planter of Assam has is about the damage to tea plantations due to frequent inundation along the flood-plains of Brahmaputra, and the damage to tea plantation and the consequent loss in tea productivity is due to rising level of the river bottom because of siltation and the changing course of the river system. The ultimate consequences of site desertification are soil degradation, alteration in available water and its quality, and the consequent decline in food, fodder and fuel-wood yields essential for the economic well-being of rural communities.
With reference to ‘desertification’, as described in the passage, the following assumptions have been made :
- 1. Desertification is a phenomenon in tropical areas only.
- 2. Deforestation invariably leads to floods and desertification.
Which of the above assumptions is/are valid?
Answer (d) & explanation
Neither assumption is valid (d). Step 1: the passage says desertification is "often linked to the arid, semi-arid and sub-humid ecosystems". These exist outside the tropics too. So assumption 1, tropics only, fails. Step 2: assumption 2 says deforestation invariably leads to floods and desertification. "Invariably" means always, and the passage never says that. Step 3: so 2 fails too, and options (a), (b) and (c) fail.
Tip: "only" and "invariably" are absolute words. A passage that says "often linked" supports a tendency, not a rule. India itself has large drylands, in Rajasthan and Gujarat, that face desertification.
Answer as per the official UPSC answer key.
Read the passage
A diversity of natural assets will be needed to cope with climate change and ensure productive agriculture, forestry, and fisheries. For example, crop varieties are needed that perform well under drought, heat, and enhanced CO₂. But the private-sector and farmer-led process of choosing crops favours homogeneity adapted to past or current conditions, not varieties capable of producing consistently high yields in warmer, wetter, or drier conditions. Accelerated breeding programmes are needed to conserve a wider pool of genetic resources of existing crops, breeds, and their wild relatives. Relatively intact ecosystems, such as forested catchments, mangroves, wetlands, can buffer the impacts of climate change. Under a changing climate, these ecosystems are themselves at risk, and management approaches will need to be more proactive and adaptive. Connections between natural areas, such as migration corridors, may be needed to facilitate species movements to keep up with the change in climate.
With reference to the above passage, which of the following would assist us in coping with the climate change?
- 1. Conservation of natural water sources
- 2. Conservation of wider gene pool
- 3. Existing crop management practices
- 4. Migration corridors
Select the correct answer using the code given below.
Answer (b) & explanation
Statements 1, 2 and 4 help us cope with climate change (b). Step 1: the passage says catchments and wetlands buffer climate impacts, so conserving natural water sources helps (1). Step 2: it names a wider genetic pool (2) and migration corridors (4) as ways to cope. Corridors let animals and plants move as the climate shifts. Step 3: statement 3, existing crop practices, fails. The passage says current practice "favours homogeneity" and must change. So options (a), (c) and (d) fail.
Tip: watch for the word "existing". If a passage criticises present practice, any statement praising it is wrong.
Answer as per the official UPSC answer key.
Read the passage
A diversity of natural assets will be needed to cope with climate change and ensure productive agriculture, forestry, and fisheries. For example, crop varieties are needed that perform well under drought, heat, and enhanced CO₂. But the private-sector and farmer-led process of choosing crops favours homogeneity adapted to past or current conditions, not varieties capable of producing consistently high yields in warmer, wetter, or drier conditions. Accelerated breeding programmes are needed to conserve a wider pool of genetic resources of existing crops, breeds, and their wild relatives. Relatively intact ecosystems, such as forested catchments, mangroves, wetlands, can buffer the impacts of climate change. Under a changing climate, these ecosystems are themselves at risk, and management approaches will need to be more proactive and adaptive. Connections between natural areas, such as migration corridors, may be needed to facilitate species movements to keep up with the change in climate.
With reference to the above passage, the following assumptions have been made :
- 1. Diversification of livelihoods acts as a coping strategy for climate change.
- 2. Adoption of monocropping practice leads to the extinction of plant varieties and their wild relatives.
Which of the above assumptions is/are valid?
Answer (c) & explanation
Both assumptions are valid (c). Step 1: the passage links the diversity of natural assets to farming, forestry and fisheries. UPSC's key reads this as diversity of livelihoods, which helps people cope with climate shocks. So assumption 1 holds. Step 2: the passage treats homogeneity, growing one uniform crop, as a threat to genetic resources that need protection. So monocropping leads to the loss of plant varieties and their wild relatives. Assumption 2 holds. Step 3: so options (a), (b) and (d) fail.
Tip: diversity reduces risk, in farming as in money. When one crop or job fails, others carry the load. That idea runs through most climate passages.
Answer as per the official UPSC answer key.