UGC NET Questions (Paper – 1)

Afforestation establishes new forests that remove carbon dioxide from the atmosphere and store it in biomass and soils, thereby acting as a carbon sink and helping to offset emissions.

Option A:
Incorrect; forests do not simply reflect all solar radiation, and their climatic effects are more complex than uniform cooling by reflection.

Option B:
Correct; it explains how planting trees sequesters carbon and lowers net greenhouse gas concentrations.

Option C:
Incorrect; even large-scale tree planting cannot eliminate the need to reduce emissions from sectors like energy, transport and industry.

Option D:
Incorrect; trees also emit water vapour and other gases; saying they emit only oxygen oversimplifies plant physiology.

Biotic potential is the theoretical maximum rate of increase a population could achieve if resources were unlimited and conditions perfect. Carrying capacity is the upper limit of population size that the environment can support over time without serious degradation. Real populations grow more slowly as they approach this limit.

Option A:
Option A is incorrect because biotic potential is not the realised growth rate; it is a hypothetical maximum. Carrying capacity refers to population size, not a growth rate.

Option B:
Option B is correct as it clearly separates maximum reproductive capacity (biotic potential) from maximum sustainable population size (carrying capacity).

Option C:
Option C is incorrect; these terms do not mean simple counts of deaths or births per year but broader ecological concepts about growth and limits.

Option D:
Option D is incorrect because both concepts apply to all organisms, including plants, animals and microorganisms.

In-situ conservation means protecting species in the ecosystems where they naturally occur. National parks and wildlife sanctuaries maintain habitats and ecological processes, allowing species to continue their evolution and interactions. This approach preserves not only individual species but also community relationships and genetic diversity. Therefore, national parks conserving species in their natural surroundings are prime examples of in-situ conservation.

Option A:
Option A is incorrect because zoological parks keep animals in captivity outside their natural habitats. This is an ex-situ strategy, useful but different from in-situ habitat protection.

Option B:
Option B is incorrect as seed banks store genetic material off-site. Although valuable for crop conservation, they do not maintain species within natural ecosystems.

Option C:
Option C is incorrect since botanical gardens cultivate plants, often outside their native ranges and in controlled settings. Like zoos and seed banks, they represent ex-situ conservation.

Option D:
Option D is correct because national parks maintain natural landscapes and ecological integrity. They allow species to live and reproduce where ecological interactions and evolutionary processes can continue.

The Air Quality Index (AQI) is designed to simplify complex air quality data by translating pollutant concentrations into a single scale with associated health categories. It helps citizens understand whether air is good,moderate or hazardous on a given day. The stem describes a composite indicator that communicates air quality status,which matches the AQI. Thus Air Quality Index is the correct term.

Option A:
An emission inventory is a detailed list of pollutants released from various sources over a period. It is used for planning and modelling,but it does not directly provide a simple public facing status index as described in the question.

Option B:
Air Quality Index values are calculated using sub indices for pollutants like PM2.5,PM10, NO₂ and O₃ and then reporting the worst as the overall index. This method allows a quick health oriented interpretation. These features align with the stem’s emphasis on a single number and category.

Option C:
Stack height refers to the physical height of chimneys used to disperse pollutants more widely. It is an engineering design parameter,not an information tool for the public.

Option D:
Particulate factor is not a standard term for summarising air quality. While particulates are important pollutants, their levels alone do not create the overall air quality category mentioned in the question.

Mass media can shape public understanding and attitudes toward the environment by reporting on problems, policies and solutions. When media outlets share credible information, showcase local success stories and invite citizen engagement, they help build a culture of environmental responsibility. This role supports democratic decision-making and can put pressure on institutions to act more sustainably.

Option A:
Option A is incorrect because avoiding environmental topics misses opportunities for education and debate on crucial issues affecting society.

Option B:
Option B is correct as it underlines how media can inform, inspire and mobilise people around environmental concerns, which is essential for broad-based change.

Option C:
Option C is incorrect since promoting overconsumption without context reinforces unsustainable lifestyles and undermines environmental goals.

Option D:
Option D is incorrect because hiding pollution problems protects narrow interests at the expense of public health and ecological integrity, contradicting the watchdog function of media.

The 2030 Agenda for Sustainable Development, adopted by UN member states in 2015, sets out a framework of 17 Sustainable Development Goals. These goals cover a broad range of issues including poverty, hunger, health, education, gender equality, clean water, climate action and partnerships. They build on the earlier Millennium Development Goals but are more comprehensive and universal. Therefore, the correct number of SDGs is 17, as stated in Option C.

Option A:
Option A is incorrect because 8 goals were associated with the Millennium Development Goals, not with the SDG framework. The SDGs expanded both the number and scope of targets.

Option B:
Option B is incorrect since 12 is not the agreed number in the UN 2030 Agenda. Some thematic groupings exist, but the official list has 17 goals.

Option C:
Option C is correct because it reflects the adopted global consensus on the structure of the 2030 Agenda. Each goal is accompanied by specific targets and indicators to monitor progress.

Option D:
Option D is incorrect; 25 goals have never been part of the formal SDG framework. Using an incorrect number can lead to confusion in exam questions on global development agendas.

Statements A, B, D and E are correct on individual choices, social norms, policy/infrastructure support and community initiatives. Statement C is false because information alone is usually insufficient for sustained change. Statement F is false because education influences long-term attitudes and behaviours. Therefore, the correct combination is A, B, D and E only.

Option A:
Option A is correct because it includes all true statements and excludes C and F, which overstate information sufficiency and deny education’s role.

Option B:
Option B is incorrect because it includes C (false).

Option C:
Option C is incorrect because it includes C and F (both false).

Option D:
Option D is incorrect because it includes F (false) and omits B, missing social norms/peer influence.

Statements A and B are correct because ESD is about integrating sustainability dimensions across curricula and promoting critical and participatory pedagogies. Statements C and D are incorrect: ESD is cross-disciplinary and actively encourages learner participation in real-world sustainability projects. Therefore, the combination A and B only is correct.

Option A:
Option A is incomplete as it ignores B, which correctly highlights pedagogy focused on critical thinking and problem solving. Without B, the active-learning dimension of ESD is missing.

Option B:
Option B is correct since it combines the two accurate statements and excludes C and D, which misrepresent the scope and methods of ESD. This reflects official formulations of ESD in policy documents.

Option C:
Option C is incorrect because it adds C, implying that ESD is confined to environmental sciences, which contradicts the idea that all disciplines should address sustainability.

Option D:
Option D is incorrect as it groups B, C and D, treating both C and D as correct. D wrongly suggests ESD discourages participation, which goes against the experiential emphasis of ESD.

Early warning systems detect impending hazards and communicate timely information so that people can take protective action. Cyclone alerts broadcast before landfall give communities time to evacuate or secure property. The stem clearly describes this function,so “early warning” is the correct term. It is a key component of disaster risk reduction.

Option A:
Recovery refers to restoring livelihoods and infrastructure after a disaster has occurred. It does not capture the advance information sharing described in the question.

Option B:
Response includes immediate rescue and relief activities during or just after impact. Although related,it is activated after the warning,not the warning itself.

Option C:
Mitigation involves long term measures that reduce the potential impact of hazards,such as embankments or building codes. It is different from the communication systems that warn people of imminent events.

Option D:
Early warning saves lives by turning risk information into action through effective communication and preparedness. This is exactly the role depicted in the question stem.

Blue baby syndrome arises when nitrate contaminated water is ingested by infants and converted to nitrite in the body. Nitrite oxidises haemoglobin to methemoglobin,which cannot carry oxygen effectively. The resulting condition is called methemoglobinemia. Thus the medical term in option B correctly matches the syndrome described.

Option A:
Asthma is a chronic inflammatory disease of the airways characterised by wheezing and breathlessness. It is associated with allergens and air pollution but not specifically with nitrate contaminated water. Therefore it is not the correct answer.

Option B:
Methemoglobinemia causes reduced oxygen delivery to tissues and can result in bluish discoloration of skin,especially in babies,leading to the common name “blue baby syndrome”. Because the stem directly links nitrates in water to this outcome,this term is accurate.

Option C:
Fluorosis arises from long term ingestion of excessive fluoride in water or food,leading to dental or skeletal problems. It does not produce the acute cyanosis associated with blue baby syndrome,so it is not appropriate for the blank.

Option D:
Silicosis is a lung disease caused by inhalation of crystalline silica dust,primarily affecting miners and construction workers. It has no connection with nitrate pollution of drinking water.

Statements A, B, D and E are correct and consistent with basic climate science. Statement A correctly lists major anthropogenic greenhouse gases, statement B explains how they trap outgoing long-wave radiation, statement D points to human-induced enhancement of global warming and statement E recognises the protective role of stratospheric ozone. Statement C is incorrect because the natural greenhouse effect is essential for maintaining Earth’s mean temperature at a habitable level. Therefore, the only combination that includes all true statements while excluding the false one is A, B, D and E.

Option A:
Option A is incorrect because it includes A, B and D but omits E. While A, B and D are indeed correct statements, E is also correct as stratospheric ozone shields living organisms from harmful ultraviolet radiation. By leaving out a true statement, this option does not fully capture the set of correct statements.

Option B:
Option B is correct because it includes statements A, B, D and E, all of which are scientifically accurate. It excludes statement C, which falsely portrays the greenhouse effect as entirely harmful and ignores its natural role in maintaining habitable temperatures. Hence, this option represents the complete and precise set of correct statements asked for in the question.

Option C:
Option C is incorrect because it adds statement C to the set of otherwise correct statements A, B and D. Statement C is wrong since the greenhouse effect in its natural form is beneficial and only its anthropogenic enhancement is problematic. Including a false statement makes this combination unacceptable.

Option D:
Option D is incorrect because it combines B, C, D and E. Although B, D and E are correct, the presence of statement C, which misrepresents the greenhouse effect as wholly harmful, makes the entire combination wrong. A valid answer must exclude all incorrect statements.

The 2022 notification banned a list of 19 single-use plastic items that typically have short useful lives but high littering potential. Examples include earbuds with plastic sticks, certain plates, cups, cutlery and decorative thermocol. By targeting these low-utility items first, the policy aims to reduce visible pollution while giving time to design alternatives and improve management for other plastic products.

Option A:
This option is incorrect because many plastic products, especially essential and regulated uses, remain allowed; the ban is selective.

Option B:
This option correctly states the focus on low-utility, high-litter items and illustrates the rationale behind the list.

Option C:
Export-oriented units are not the primary focus; the ban addresses domestic circulation of these items.

Option D:
Carry bags are regulated mainly through minimum thickness requirements rather than a blanket ban on thicker bags.

Biodiversity encompasses variation at three main levels: genetic diversity within species,species diversity within communities and ecosystem diversity across landscapes. The stem explicitly mentions diversity within species,between species and of ecosystems. This threefold description is the standard way of defining biodiversity,so the correct term is biodiversity.

Option A:
Biomagnification refers to increasing concentration of certain pollutants as they move up food chains. It is a process affecting organisms but is not a measure of variety of life. Hence it does not fit the definition in the question.

Option B:
Bioaccumulation denotes the progressive build up of substances,such as pesticides,in an organism over time. While related to ecological health,it does not capture the multiple levels of diversity specified in the stem.

Option C:
Biodiversity is the umbrella term for the total variety and variability of living organisms and the ecological complexes they form. It directly corresponds to the three dimensions of diversity mentioned,so this option correctly names the concept.

Option D:
Biodegradation is the breakdown of substances by microorganisms. It relates to waste management and nutrient cycling rather than to variation in living forms. Therefore it is not the intended concept here.

Green buildings are designed to reduce resource use and environmental footprints throughout their life cycles. They incorporate strategies such as effective insulation, natural lighting, water-saving fixtures and sustainable materials. The goal is to provide comfortable, healthy indoor environments while using less energy, water and raw materials. Therefore, the feature emphasising efficient use of energy, water and materials with minimal environmental impact correctly reflects green building principles.

Option A:
Option A is correct because it summarises the integrated approach of sustainable building design. Such buildings often include renewable energy systems and rainwater harvesting, further lowering their ecological footprint.

Option B:
Option B is incorrect since exclusive reliance on air-conditioning and artificial lighting generally increases energy consumption. Green design encourages natural ventilation and daylighting wherever possible.

Option C:
Option C is incorrect because uninsulated concrete and glass buildings can lead to high heat gain or loss, making them energy inefficient. Green architecture promotes appropriate shading and insulation to maintain comfort with lower energy input.

Option D:
Option D is incorrect as ignoring local climate results in buildings poorly adapted to their environment. Climate-responsive design is a hallmark of sustainable architecture, reducing reliance on mechanical heating and cooling.

Statements A, B and D are correct: indigenous knowledge contains sustainable practices, combining it with science can improve management and rights plus prior informed consent are key ethical principles. Statement C is incorrect because indigenous knowledge continues to be relevant for contemporary environmental problems like climate adaptation and biodiversity conservation. Therefore, the combination A, B and D only is correct.

Option A:
Option A is incomplete because it omits D, which rightly stresses the need for respecting rights and consent when using indigenous knowledge. Without D, ethical aspects are not fully represented.

Option B:
Option B is incorrect as it includes C, implying that indigenous knowledge is obsolete, which contradicts numerous examples of its contemporary value.

Option C:
Option C is incorrect since it groups B, C and D and treats C as correct. Although B and D are valid, the inclusion of C makes the combination unacceptable.

Option D:
Option D is correct because it includes all three true statements while excluding the disparaging and incorrect statement C. It reflects both the practical and ethical dimensions of using indigenous knowledge in environmental management.