UGC NET Questions (Paper – 1)

The methodology links credits to canopy density reached after several years, not merely to saplings planted. Only if plantations attain a canopy cover of roughly 40% within the monitoring period are green credits issued. This ensures that restoration efforts lead to surviving, growing trees and real improvements in ecological condition rather than symbolic one-day drives.

Option A:
This option is incorrect because sapling counts on the planting day tell little about long-term survival or ecological outcomes.

Option B:
This option correctly identifies the focus on canopy cover over time, which is meant to encourage serious restoration planning and maintenance.

Option C:
Monocultures of exotic species can harm biodiversity; the programme encourages ecologically sound species choices rather than only fast-growing exotics.

Option D:
Restoration is often needed on degraded lands; limiting plantations to already dense forests would defeat the purpose of improving degraded areas.

Statements A, B and D correctly characterise research ethics. Ethics committees review proposals involving human or animal subjects, plagiarism and data falsification are clear misconduct, and informed consent with confidentiality is central to human research. Statements C, E and F are false because ethics apply to all disciplines, institutions should have formal review mechanisms and researchers at all levels benefit from ethics training.

Option A:
Option A is incorrect because it omits D and therefore does not include informed consent/confidentiality.

Option B:
Option B is correct because it includes A, B and D and excludes C, E and F.

Option C:
Option C is incorrect because it omits A and therefore misses the role of ethics committees.

Option D:
Option D is incorrect because it includes C (false), so it mixes true and false statements.

Statements A, B, C, D and E are correct on knowledge, rights, consent and consequences of exclusion. Statement F is wrong because UNDRIP is relevant for rights and participation norms. Thus A, B, C, D and E only is correct.

Option A:
Option A is incomplete because it omits E.

Option B:
Option B is incomplete because it omits A.

Option C:
Option C is correct because it includes A, B, C, D and E and excludes F.

Option D:
Option D is incorrect because it includes F (false) and omits B.

Statements C and D are wrong, whereas A and B are correct. Statement C is incorrect because indoor air pollution is a major concern in many rural households that use solid fuels such as wood, dung or crop residues for cooking. Statement D is also incorrect because air quality standards are framed primarily to protect human health, although they may also consider welfare, vegetation and materials. Therefore, the correct answer must identify both C and D as wrong statements together.

Option A:
Option A is incorrect because it singles out C only as wrong while ignoring D. Although C is indeed wrong, D is also an incorrect statement since air quality standards explicitly aim to protect human health. Because the question asks for all wrong statements, excluding D makes this option incomplete.

Option B:
Option B is incorrect because it selects D only as the wrong statement and treats C as correct. As indoor air pollution is a serious health issue in many rural areas of developing countries, statement C cannot be accepted as true. Leaving out C from the set of wrong statements makes this option unacceptable.

Option C:
Option C is incorrect because it claims that A, C and D are wrong. Statements C and D are wrong, but statement A is correct because fine particulate matter (PM2.5) can indeed penetrate deep into the respiratory system and reach the bloodstream. Including a correct statement among wrong ones invalidates this combination.

Option D:
Option D is correct because it accurately identifies C and D as the wrong statements and excludes A and B, which are scientifically valid. It recognises that indoor air pollution is a serious rural health issue and that air quality standards serve to protect human health. Hence this combination fully satisfies the requirement of selecting the wrong statements.

Statements A, B, C, E and F are correct and jointly describe objectives, measures and co-benefits of watershed management. They show how soil and water are conserved, how rainwater harvesting aids recharge, how community participation improves outcomes and how biodiversity can recover in treated areas. Statement D is wrong because watershed development is widely used for drought mitigation and livelihood support. Therefore, the correct answer is the combination A, B, C, E and F only.

Option A:
Option A is correct since it includes all true statements and excludes D, which denies key benefits of watershed development. It reflects the integrated ecological and livelihood focus of watershed programmes.

Option B:
Option B is incorrect because it omits F and thereby ignores the potential for biodiversity regeneration in treated watersheds. It also still excludes D but gives an incomplete picture of environmental benefits.

Option C:
Option C is incorrect as it excludes A and thus fails to mention the basic aim of watershed management. Without A, the central resource-conservation objective is lost.

Option D:
Option D is incorrect since it omits B, leaving out typical measures such as contour bunding and check dams, which are crucial to understanding how watershed activities are implemented.

Power plants, industries and vehicles emit sulphur dioxide and nitrogen oxides into the atmosphere. These gases are oxidised to sulphuric and nitric acids, which can be deposited with rain, snow or dust. Acidic deposition lowers the pH of soils and water bodies, damaging forests, aquatic life and buildings. Hence, control of SO₂ and NOx is central to acid rain mitigation.

Option A:
Option A is incorrect because carbon monoxide and ozone are associated more with urban smog and health impacts than with acid deposition.

Option B:
Option B is correct since SO₂ and NOx are the main precursors that form strong acids responsible for acid rain.

Option C:
Option C is incorrect as methane and CFCs are important greenhouse and ozone-depleting gases respectively, but they are not primary acid rain precursors.

Option D:
Option D is incorrect because argon and helium are inert gases that do not form such acids.

Statements A, B, C, E and F are correct because they describe the protective function of ozone, uses of CFCs, the role of the Montreal Protocol, the need to evaluate substitutes and the slow recovery timeline. Statement D is false since ozone depletion increases UV-B reaching the surface, leading to health effects like skin cancer and cataracts and harming ecosystems. Therefore, the combination that includes A, B, C, E and F while excluding D is correct.

Option A:
Option A is incorrect because it omits E and F and therefore does not mention the importance of evaluating substitutes or the time scale of recovery, which are critical aspects of current ozone discussions.

Option B:
Option B is correct as it covers both historical causes and ongoing management challenges, while rejecting the claim that depletion has no health or ecological consequences.

Option C:
Option C is incorrect since it includes D, which denies well-established effects of increased UV-B, and thus mixes false information with correct statements.

Option D:
Option D is incorrect as it leaves out B, so it fails to state the central role of CFCs in causing ozone depletion, even though that is a foundational example in the unit.

Statements A, B, C and D together describe a comprehensive approach to sustainability. Green campus practices, environmental audits, curricular integration and active eco-clubs all contribute to building a culture of sustainability. Statements E and F are wrong because sustainability policies are relevant for campuses and initiatives should be continuous, not restricted to a single day.

Option A:
Option A is incorrect because it omits D and therefore underestimates the role of eco-clubs in sustaining initiatives.

Option B:
Option B is correct because it includes A, B, C and D and excludes E and F.

Option C:
Option C is incorrect because it omits B and C (audits and curriculum integration), so it is incomplete.

Option D:
Option D is incorrect because it omits A (core green campus practices), so it is incomplete.

India’s green shipping plans envisage converting vessels on coastal and inland waterways to run on cleaner energy sources. This includes proposals for hydrogen-powered and solar-assisted ships, as well as green hydrogen hubs at key ports. The initiative aligns with both national net-zero ambitions for 2070 and international maritime emission-reduction goals. It also includes financial and infrastructural measures like a Maritime Development Fund to support the transition. (Reuters)

Option A:
Banning renewable energy in ports and ships would contradict the very notion of green shipping. Current plans instead highlight increasing the share of renewables in port energy consumption and vessel propulsion.

Option B:
This option accurately reflects the essence of current announcements: a proactive shift towards renewable-energy-based propulsion on waterways. It captures the linkage to net-zero goals and mentions hydrogen and solar, which feature prominently in policy discussions.

Option C:
Increasing diesel subsidies would lock in fossil-fuel dependence and run against decarbonisation objectives. There is no evidence that this is the direction of India’s maritime policy in recent climate-related announcements.

Option D:
Restricting clean propulsion technologies to foreign vessels while denying them to domestic ships would be illogical and counter-productive. Policies emphasise greening India’s own fleet and infrastructure, not limiting innovation to external actors.

Biodiversity hotspots are areas that contain exceptionally high numbers of species, including many that are endemic, but have also suffered substantial loss of their original natural habitat. This combination of richness, uniqueness and threat makes them global priorities for conservation action.

Option A:
Option A is incorrect because low richness and little disturbance would not meet the hotspot criteria, which emphasise both high diversity and high threat.

Option B:
Option B is correct as it captures the defining features of hotspots: high species richness, high endemism and extensive habitat loss.

Option C:
Option C is incorrect since hotspots are not defined solely by the presence of large mammals; plant diversity and overall endemism are central to the concept.

Option D:
Option D is incorrect because hotspots, by definition, do require high conservation priority due to the risk of large numbers of extinctions.

Unlike carbon and nitrogen, which have major gaseous components in the atmosphere, phosphorus moves primarily through rocks, soils, water and organisms. Weathering of rocks releases phosphate into soils and water bodies, where it is taken up by plants and moves through food webs. Over long time scales, it returns to sediments and rocks. This dominance of solid and aqueous phases and the absence of a substantial atmospheric form make the phosphorus cycle largely sedimentary, as indicated in Option B.

Option A:
Option A is incorrect because phosphorus does not have a large atmospheric gaseous phase. Nitrogen and carbon dioxide are prominent atmospheric gases, but phosphorus compounds are not abundant in the air.

Option B:
Option B is correct since it highlights the key difference that phosphorus cycles mostly between land, water and biota without a major gaseous reservoir. This characteristic contributes to phosphorus often being a limiting nutrient in ecosystems.

Option C:
Option C is incorrect because rocks and sediments are central to the long-term phosphorus cycle. Ignoring them misrepresents how phosphorus is stored and released.

Option D:
Option D is incorrect; phosphorus cycles both on land and in aquatic systems. Terrestrial soils and freshwater bodies are important components of its global cycle.

Urban green planning involves designing and managing vegetation,parks and green corridors to enhance environmental quality and livability in cities. Street tree plantations directly contribute to this goal by improving air quality,providing shade and mitigating noise. The stem describes exactly such activities,so “green” planning is the correct term. Therefore Option D is appropriate.

Option A:
Industrial planning focuses on industrial location and development,not on integrating vegetation for ecosystem services in cities.

Option B:
Transport planning addresses mobility networks; tree planting can support it but the activity described is primarily about greening and ecosystem benefits.

Option C:
Energy planning concerns supply and demand of energy systems,not roadside tree programmes for pollution and shade benefits.

Option D:
Green planning explicitly integrates natural elements to improve air quality,shade and noise reduction,matching the example in the stem.

Blue baby syndrome occurs when high nitrate in drinking water is converted to nitrite in the infant’s body, which then reacts with haemoglobin to form methemoglobin. Methemoglobin cannot carry oxygen effectively, causing cyanosis and potentially serious health effects. Infants are particularly vulnerable because their digestive and enzymatic systems are not fully developed. Therefore, excessive nitrate in drinking water is the main contaminant associated with this condition.

Option A:
Option A is correct because it identifies nitrate as the crucial contaminant that can lead to methemoglobinemia, especially when levels exceed safe standards. Many rural areas with intensive fertiliser use face this risk when wells are contaminated.

Option B:
Option B is incorrect since fluoride in excess causes dental and skeletal fluorosis, not blue baby syndrome. Its health effects are different and relate mainly to bones and teeth.

Option C:
Option C is incorrect because calcium hardness is not associated with cyanosis or impaired oxygen transport. Hard water may cause scaling but is not the cause of methemoglobinemia.

Option D:
Option D is incorrect; high dissolved oxygen is generally beneficial for aquatic life and has no link to blue baby syndrome in humans. Oxygen deficiency, not excess, is usually a problem in polluted water.

A narrow base in a population pyramid means fewer children are being born, indicating low fertility. A relatively broader middle and top show higher proportions of adults and elderly. This pattern is typical of societies in later stages of demographic transition with ageing populations. Hence, the option describing declining fertility and ageing is correct.

Option A:
Option A is incorrect because high fertility would produce a wide base, not a narrow one. Many births each year create a strong young cohort.

Option B:
Option B is correct as it captures both key features: low fertility and an ageing structure. It matches the constrictive shape seen in many developed countries.

Option C:
Option C is incorrect since rapid population growth with many children would again create a broad base. That shape is expanding, not constrictive.

Option D:
Option D is incorrect because no real population has zero elderly; such a description ignores demographic reality. A broad top implies there are many older people, not none.

The term carrying capacity describes the maximum population size that an environment can sustain over time. It assumes a balance between resource availability and population demands. If population exceeds this level,resources are degraded and sustainability is threatened. Hence carrying capacity is the most appropriate term for the situation in the question.

Option A:
Biotic potential refers to the maximum reproductive capacity of a population under ideal conditions. It does not consider resource limitations or environmental constraints. Therefore it cannot represent the sustainable maximum that the environment can support.

Option B:
Carrying capacity is defined as the largest population that an environment can maintain without long term degradation. It directly links population level with resource availability and ecosystem resilience. This makes it the correct concept for describing the sustainable limit mentioned in the stem.

Option C:
Demographic dividend describes the economic advantage derived from a larger working age population relative to dependants. It is an economic and demographic concept,rather than an ecological one. Thus it does not denote the resource based population limit described in the question.

Option D:
Population density simply indicates the number of individuals per unit area. High density may or may not exceed the environment’s sustainable limit. Therefore population density alone does not capture the idea of a maximum sustainable population.