UGC NET Questions (Paper – 1)

Organic farming is based on using compost,green manure,biological pest control and crop rotations instead of synthetic chemicals. It seeks to enhance soil fertility, biodiversity and ecological balance. The stem clearly mentions avoiding synthetic fertilisers and pesticides and relying on natural inputs,which is the defining feature of organic farming. Thus organic farming is the correct term.

Option A:
Organic farming focuses on long term soil health and minimisation of chemical residues in food and the environment. Certification standards specify which inputs are permitted and which are prohibited. Because the question stem mirrors these ideas,this option correctly captures the concept.

Option B:
Intensive farming seeks to maximise output per unit area through high inputs of fertilisers, pesticides and irrigation. In many cases it relies heavily on synthetic chemicals,the opposite of what the question describes. Hence it is not appropriate for the blank.

Option C:
Shift cultivation (or shifting cultivation) involves clearing forest patches, growing crops for a few years and then moving to a new area. While it may use few chemicals,it is defined by mobility and fallows rather than deliberate avoidance of synthetic inputs,so it does not match exactly.

Option D:
Monoculture farming refers to growing a single crop species over large areas for many seasons. It can occur under organic or chemical intensive regimes but is not defined by input type. Therefore it does not neatly fit the description in the stem.

The Ramsar Convention,adopted in the Iranian city of Ramsar in 1971,is dedicated specifically to the conservation and wise use of wetlands. It establishes a list of wetlands of international importance and promotes integrated management. The stem clearly refers to an agreement on wetlands,so the correct answer is the Ramsar Convention.

Option A:
The Basel Convention deals with the control of transboundary movements of hazardous wastes and their disposal. It is an important environmental treaty but does not focus on wetlands,so it does not match the description in the question.

Option B:
The Ramsar Convention encourages countries to designate suitable wetlands and to maintain their ecological character through national planning. This emphasis on wise use aligns perfectly with the stem.

Option C:
The Stockholm Convention targets persistent organic pollutants,aiming to eliminate or restrict their production and use. It is not concerned primarily with wetlands conservation.

Option D:
The Montreal Protocol is an agreement to phase out ozone depleting substances to protect the ozone layer. Although also environmental,it has a different focus from wetlands management.

In the later stage of demographic transition, both fertility and mortality rates are low. As a result, population growth slows and may stabilise, with a more balanced age structure and higher life expectancy. This stage is often associated with developed economies and improved education, health and social security. Therefore, describing the low stationary stage as having low birth and low death rates with a stabilising population is accurate, as stated in Option C.

Option A:
Option A is incorrect because high birth and high death rates typify the earliest, high stationary stage, not the later low stationary stage. At that early stage, population growth is slow due to high mortality.

Option B:
Option B is incorrect since high birth and rapidly falling death rates correspond to the early expanding stage, where population grows quickly. This is not the stable later stage.

Option C:
Option C is correct as it summarises the demographic conditions in advanced stages of transition. Low fertility, combined with low mortality, brings population growth close to zero, leading to stabilisation.

Option D:
Option D is incorrect because a combination of low birth and high death rates would produce population decline, which is more extreme than the typical low stationary stage.

Total fertility rate (TFR) is defined as the average number of children a woman would have if she experienced the current age specific fertility rates throughout her reproductive life. It is a synthetic measure that summarises fertility behaviour in a single number. Because the stem describes this average across reproductive years,the correct term is total fertility rate.

Option A:
Crude birth rate measures the number of live births per thousand population in a year. It does not reflect age specific fertility patterns or lifetime childbearing of women. Therefore it does not match the detailed description in the question.

Option B:
Infant mortality rate is the number of deaths of infants under one year per thousand live births in a given year. It is a mortality indicator rather than a fertility measure. Hence it cannot be the correct answer.

Option C:
Sex ratio indicates the proportion of males and females in a population. It tells us about gender balance but not about the average number of children born to women. Thus it is unrelated to the concept defined in the stem.

Option D:
Total fertility rate directly addresses the hypothetical number of children per woman across her reproductive span,assuming prevailing fertility rates. This aligns exactly with the definition given in the question.

Biomagnification occurs when persistent, fat-soluble pollutants accumulate at higher levels in a food chain. Small organisms like plankton take up low concentrations from water, but predators eat many contaminated prey. At each trophic level, the pollutant becomes more concentrated in body tissues, so top predators show the highest levels. The classic example is DDT accumulation from plankton to fish to fish-eating birds.

Option A:
Option A is incorrect because water generally has lower concentration than organisms; pollutants move into and concentrate within living tissues.

Option B:
Option B is incorrect; biomagnification means increasing, not decreasing, concentrations at higher trophic levels.

Option C:
Option C is correct as it describes rising concentration from lower to higher levels, matching observed patterns for DDT and similar pesticides.

Option D:
Option D is incorrect because DDT is persistent and not completely degraded before entering food chains, which is why biomagnification occurs.

Segregation at source means that waste generators separate different categories of waste, such as wet and dry, before handing them over for collection. This greatly improves the efficiency of recycling,composting and safe disposal. The stem clearly refers to separation of biodegradable and non biodegradable waste at the point of generation,which is exactly segregation at source. Therefore this is the correct answer.

Option A:
Landfilling refers to final disposal of waste in engineered or open dumpsites. It occurs at the end of the waste management chain and does not describe the initial separation practice mentioned in the question.

Option B:
Incineration involves burning waste at high temperatures to reduce volume and sometimes generate energy. It is a treatment method for mixed or specific waste types,not the act of separating them beforehand.

Option C:
Recycling plants are facilities where segregated materials like paper,plastic and metal are processed into new products. Although they depend on good segregation at source,they are a downstream infrastructure element and not the behaviour described in the stem.

Option D:
Segregation at source ensures that organic waste can be composted and dry recyclables can be recovered effectively. By keeping different streams separate,it reduces contamination and environmental impacts. This explanation matches the practice highlighted in the question.

The Human Development Index is a composite index that measures development in terms of human well-being rather than only income. It includes three core dimensions: a long and healthy life, knowledge and a decent standard of living. A long and healthy life is represented by indicators such as life expectancy at birth. Hence, among the options given, “a long and healthy life” directly corresponds to one of the HDI dimensions and is therefore correct.

Option A:
Option A is incorrect because military strength is not a part of HDI and is not used to assess human development. HDI focuses on human welfare, not military capability or strategic power. Therefore, this option is unrelated to HDI’s core dimensions.

Option B:
Option B is correct as HDI uses health as a central dimension, typically measured through life expectancy. A long and healthy life reflects the ability of people to live free from preventable diseases and premature death, which is a key aspect of development.

Option C:
Option C is incorrect because religious diversity may have social importance but is not an explicit dimension in HDI. The index does not compare countries based on religion or cultural variety.

Option D:
Option D is incorrect as political stability, though important for development, is not directly used as one of the three HDI dimensions. HDI’s focus is on health, education and income rather than political variables.

Integrated solid waste management recognises that no single method can address all waste streams effectively. It therefore uses a mix of strategies,applied in a planned hierarchy,from reduction to final disposal. The stem explicitly lists several methods used together in a coordinated way,which is the essence of integrated management. Hence integrated is the correct term.

Option A:
Centralised management would emphasise control by a single authority or facility but does not necessarily imply using a range of methods. It is about governance structure rather than the combination of techniques described in the question.

Option B:
Integrated approaches aim to maximise resource recovery while minimising environmental impacts and landfill use. They require coordination between households,municipal bodies and private operators. This comprehensive nature fits the stem’s description.

Option C:
Exclusive management suggests relying on one primary method,which is contrary to the integrated philosophy. It would not capture the deliberate use of multiple techniques mentioned in the question.

Option D:
Minimal management implies very limited intervention or capacity,which would likely worsen waste problems. It has no established meaning in the technical literature on waste management,so it is not appropriate here.

Statement D is the only wrong statement because many chemicals can and do move between air, water and soil through processes such as volatilisation, deposition and leaching. Persistent pollutants can travel long distances and shift between media. Statements A, B, C, E and F correctly describe bioaccumulation, safety practices, information tools, occupational risks and international regulation. Therefore, identifying D alone as wrong is the correct answer.

Option A:
Option A is incorrect as it classifies both A and D as wrong, even though A accurately explains the behaviour of persistent organic pollutants in food chains. Grouping a true statement with a false one makes this option invalid.

Option B:
Option B is incorrect because it marks C and D together as wrong. C is actually correct in noting that labels and safety data sheets communicate essential hazard information to users, so including it among wrong statements is unjustified.

Option C:
Option C is correct since it isolates D, the sole clearly incorrect statement denying cross-media movement of chemicals. It implicitly affirms that all other statements accurately reflect environmental health principles.

Option D:
Option D is incorrect as it groups D with E, even though E is a true statement about occupational exposure affecting workers’ health. Treating E as wrong contradicts workplace health and safety evidence.

Statements A and B are correct as they highlight psychological and social determinants of pro-environmental behaviour. Statement C is wrong because awareness alone does not always translate into action; many barriers such as habits and structural constraints intervene. Statement D is also incorrect since economic instruments like taxes and subsidies can influence behaviour. Therefore, A and B only is the correct combination.

Option A:
Option A is incorrect because it includes only A and leaves out B, which is also true. Ignoring the role of social norms and peer influence provides an incomplete explanation of behaviour.

Option B:
Option B is correct because it recognises both individual-level factors (values, attitudes, knowledge, control) and social factors (norms and peer influence) while excluding statements that oversimplify or deny economic influences. This combination fits well with environmental psychology perspectives.

Option C:
Option C is incorrect since it adds C to A and B, treating C as true. C overstates the power of awareness by claiming it always guarantees behaviour change, which is not supported by evidence.

Option D:
Option D is incorrect because it groups B, C and D and accepts D, which denies the role of economic incentives. As both C and D are false, the option cannot be correct.

Ecologists describe biodiversity at multiple hierarchical levels to capture different kinds of variation in life. Genetic diversity refers to variation in genes within and between populations of a species. Species diversity concerns the number and relative abundance of species in a community. Ecosystem diversity encompasses the variety of habitats, communities and ecological processes within a region. Together, these three levels provide a comprehensive picture of biodiversity, making option A correct.

Option A:
Option A is correct because it reflects standard ecological classification used in textbooks and conservation planning. Protecting biodiversity means considering genes, species and ecosystems, not just counting species numbers.

Option B:
Option B is incorrect since atmospheric, hydrological and geological diversity refer to physical systems, not biological variation. While relevant to Earth science, they are not the three core biodiversity levels.

Option C:
Option C is incorrect because rural, urban and industrial categories describe types of human land use. They can influence biodiversity but are not themselves levels of biological diversity.

Option D:
Option D is incorrect as economic, political and cultural diversity are important social dimensions but lie outside the ecological framework for biodiversity.

Carrying capacity is an ecological concept that links population size with available resources and environmental resistance. It represents the upper limit of population that can be sustained over the long term without causing degradation of the ecosystem. If population exceeds this level, overuse and environmental damage can follow, eventually forcing numbers back down. Therefore, describing carrying capacity as the maximum number of individuals that can be supported on a long-term basis without degrading the environment, as in Option A, is conceptually accurate.

Option A:
Option A correctly states that carrying capacity is a long-term sustainable limit. It emphasises both the maximum number of individuals and the condition that the environment should not be degraded, which matches standard ecological definitions.

Option B:
Option B is incorrect because it describes a short-term crowding situation during a festival. Carrying capacity is not about temporary crowding but about the sustained equilibrium between a population and its resource base over time.

Option C:
Option C is incorrect since it refers to the crude birth rate, a demographic indicator measured as births per thousand population per year. Birth rate influences population growth but is not itself a measure of environmental support limits.

Option D:
Option D is incorrect because it describes the point of extinction, when population falls to zero. Carrying capacity refers to the maximum sustainable population size, not to the threshold at which a species disappears from an area.

The urban heat island effect describes the tendency of cities to be warmer than neighbouring rural regions, especially at night. Built surfaces such as concrete and asphalt absorb and store more solar energy than natural vegetated surfaces. Reduced vegetation also means less cooling through evapotranspiration, while waste heat from vehicles and buildings adds to warming. As a result, the explanation focusing on dense built-up surfaces and loss of vegetation correctly captures the causes of the heat island effect.

Option A:
Option A is incorrect because rural areas are generally cooler than urban areas when other factors are similar. Agricultural land and open fields often allow more cooling, not persistent warming, compared to dense city cores. So this statement reverses the typical temperature pattern.

Option B:
Option B is incorrect since tall buildings can create street canyons that trap heat and restrict air circulation. They do not simply block all solar radiation; in fact, many surfaces receive and store heat, which contributes to city warming.

Option C:
Option C is incorrect because waste heat from industrial chimneys is only one source of urban heating. Land cover changes, traffic, air-conditioning exhaust and reduced vegetation together create the cumulative warming pattern characteristic of urban heat islands.

Option D:
Option D is correct as it summarises the main physical reasons behind higher city temperatures. Impermeable, dark surfaces store heat, and the lack of trees and green spaces reduces natural shading and cooling, creating a persistent temperature difference between urban and rural environments.

Statements A, B, D and F are correct as they highlight safe water, sanitation, solid waste management and vulnerability of age groups. Statement C is wrong because handwashing with soap is highly effective in interrupting disease transmission. Statement E is also wrong, since environmental health includes both biological and chemical risks. Therefore, the combination A, B, D and F only is correct.

Option A:
Option A is incorrect because it includes C, which understates the importance of handwashing, and it omits F.

Option B:
Option B is incorrect as it includes E, which wrongly narrows environmental health to chemical issues.

Option C:
Option C is incorrect because it accepts E and omits A, denying safe water’s central role and limiting scope.

Option D:
Option D is correct since it selects A, B, D and F and excludes C and E.

Integrated Pest Management is a holistic approach that seeks to manage, not eradicate, pest populations. It prioritises preventive and non-chemical methods such as resistant varieties, crop rotation, natural enemies and mechanical controls. Chemical pesticides are used judiciously and as a last resort when economic thresholds are exceeded. The goal is to minimise environmental harm and farmer costs while maintaining acceptable crop yields, which is accurately captured in Option B.

Option A:
Option A is incorrect because exclusive reliance on chemicals can lead to resistance, resurgence of pests and environmental contamination. IPM arose partly as a response to these problems.

Option B:
Option B is correct as it emphasises combining multiple methods and focusing on economic thresholds rather than zero pests. This integrated strategy is central to sustainable pest management.

Option C:
Option C is incorrect since abandoning all pest control would expose crops to severe damage and yield loss. IPM is about careful, not absent, management.

Option D:
Option D is incorrect because genetically modified crops may be one tool among many but are not the sole basis of IPM. IPM predates GM technologies and remains broader than any single technique.