UGC NET Geography Unit 4 PYQs with Answers and Explanations

Previous Year Questions (PYQs) are among the most reliable resources for UGC NET Geography preparation. They provide insights into the examination pattern, frequently tested concepts, and the level of understanding expected from candidates. By practising Unit 4 PYQs, aspirants can become familiar with the types of questions that appear in the examination and develop effective problem-solving strategies.

UGC NET Geography Unit 4 primarily focuses on Environmental Geography, Ecosystem Dynamics, Resource Management, Environmental Policies, Sustainable Development, Climate Change, and Pollution Studies. Many questions in this unit test conceptual understanding, as well as the application of environmental theories and global agreements. 

UGC NET Geography Unit 4 Previous Year Questions with Answers

The following section includes UGC NET Geography Unit 4 PYQs along with answers and explanations. Candidates are advised to attempt the questions independently before checking the solutions. 

Question 1:

Assertion (A): The tragedy of the commons (Hardin, 1968) is more evident in open-access marine fisheries than in community-managed forest resources in India.

Reason (R): Ostrom’s principles of common-pool resource management emphasise clearly defined boundaries, collective-choice arrangements, and graduated sanctions, which are often absent in international waters.

Options:

• (A) Both A and R are true and R is the correct explanation of A.

• (B) Both A and R are true but R is not the correct explanation of A.

• (C) A is true, but R is false.

• (D) A is false, but R is true.

Answer: (A) Both A and R are true, and R is the correct explanation of A.

Explanation: Open-access marine fisheries represent a classic "Tragedy of the Commons" because they lack defined territorial boundaries and enforcement, leading to unregulated competitive overexploitation. Conversely, community forests in India rely on localized institutional rules. 

Elinor Ostrom proved that common resources survive when users build institutions with clear boundaries, community-led monitoring, and graduated penalties—mechanisms fundamentally absent in stateless open international waters, which directly explains why marine fisheries deplete faster.

Question 2: If the Kyoto Protocol is for Carbon dioxide, then the Montreal Protocol is for

(A) Methane

(B) Chlorofluorocarbons

(C) Carbon dioxide

(D) Ozone

Answer: (D) Ozone

Explanation: The question establishes an analogy based on environmental treaties and their target issues. While the Kyoto Protocol primarily targets greenhouse gases like carbon dioxide to combat climate change, the Montreal Protocol (1987) is a global treaty specifically designed to protect the Ozone layer by phasing out the production and consumption of ozone-depleting substances. 

Question 3:

Assertion (A): The concept of ‘Gaia Hypothesis’ proposed by James Lovelock views Earth as a self-regulating superorganism where biotic and abiotic components maintain homeostasis, challenging the reductionist approach in modern environmental management.

Reason (R): Negative feedback mechanisms like the CLAW hypothesis (Charlson-Lovelock-Andrae-Warren) in dimethyl sulphide production by marine phytoplankton help regulate global climate through cloud albedo.

Options:

(A) Both A and R are true and R is the correct explanation of A.

(B) Both A and R are true but R is not the correct explanation of A.

(C) A is true but R is false.

(D) A is false but R is true.

Answer: (A) Both A and R are true and R is the correct explanation of A.

Explanation: The Gaia Hypothesis suggests that living organisms and the physical environment interact to maintain conditions suitable for life on Earth. The CLAW hypothesis is an example of this interaction, where marine phytoplankton influence cloud formation and climate regulation. Therefore, the reason correctly explains the assertion. 

Because this feedback loop validates how global biological systems actively maintain physiological homeostasis, R perfectly explains A.

Question 4: The ‘Montreal Protocol’ is related to

(A) global warming

(B) ozone depletion

(C) air pollution

(D) water pollution

Answer: (B) ozone depletion

Explanation: The Montreal Protocol on Substances that Deplete the Ozone Layer is a landmark international environmental agreement signed in 1987. It was designed to universally phase out the global emissions of ozone-depleting substances (ODSs) such as chlorofluorocarbons (CFCs) and halons.

Question 5: Match the following biogeochemical cycles with their primary limiting factors or unique characteristics in environmental geography:

Options:

(A) A-3, B-4, C-1, D-2

(B) A-3, B-1, C-2, D-4

(C) A-2, B-4, C-1, D-3

(D) A-1, B-3, C-4, D-2

Answer: (A) A-3, B-4, C-1, D-2

Explanation:

• Carbon Cycle (A-3): Moves dynamically via swift atmospheric exchanges, and its massive global storage sink rests inside deep oceans.

• Nitrogen Cycle (B-4): Extensively altered by humans creating chemical fertilizers out of thin air via industrial ammonia fixation (Haber-Bosch process).

• Phosphorus Cycle (C-1): Completely lacks a gaseous atmospheric phase; it serves as the ultimate limiting nutrient for biological growth across marine ecosystems.

• Sulphur Cycle (D-2): Classified fundamentally as a sedimentary cycle with its primary structural reservoirs locked up in soil, rocks, and lithospheric minerals.

Question 6: The objective of Kyoto Protocol was to reduce greenhouse gas emissions by

(A) an average of 10% below 1995 level by the year 2010

(B) an average of 8% below 1998 level by the year 2012

(C) an average of 20% below 1997 level by the year 2009

(D) an average of 5% below 1990 level by the year 2012

Answer: (D) an average of 5% below 1990 level by the year 2012

Explanation: Adopted in 1997, the Kyoto Protocol legally committed industrialized nations (Annex I parties) to scale down their aggregate greenhouse gas emissions by an average of 5.2% below their baseline 1990 levels during its first official commitment window, which ran from 2008 to 2012.

Question 7: Which one of the following components is not taken into consideration by the Environmental Pollution Assessment (EPA) of the US to calculate the Air Quality Index (AQI)?

(A) Carbon dioxide

(B) Ground level ozone

(C) Particulate matter

(D) Sulphur dioxide

Answer: (A) Carbon dioxide

Explanation: The United States EPA tracks five major criteria pollutants to compile daily localized AQI readouts: ground-level ozone, particulate matter, carbon monoxide ($CO$), sulfur dioxide, and nitrogen dioxide. Carbon dioxide is tracked as a long-lived greenhouse gas causing global climate trends rather than an immediate criteria air pollutant responsible for toxic ambient respiratory health indicators.

Question 8: The United Nations Conference on Environment and Development (UNCED), held in Rio de Janeiro in June 1992, was chaired by: 

(A) George W Bush

(B) Maurice F Strong

(C) Tony Blair

(D) Rachel Carson

Answer: (B) Maurice F Strong

Explanation: Canadian diplomat Maurice Strong served as the official Secretary-General and chairman of the landmark 1992 United Nations Conference on Environment and Development (UNCED), widely celebrated as the Rio Earth Summit. He also served as the founding director of the United Nations Environment Programme (UNEP) two decades prior.

Question 9:

• Assertion (A): Urbanization leads to the formation of Urban Heat Islands.

• Reason (R): Concrete and asphalt absorb more heat and release it slowly at night.

Options:

(A) Both true (Note: Interpreted standard style meaning Both A and R are true and R is the correct explanation)

(B) Both false

(C) I true, II false

(D) I false, II true

Answer: (A) Both true

Explanation: Urban Heat Islands (UHIs) occur when metropolitan areas face drastically warmer temperatures than surrounding rural fringes. This happens precisely because natural soil and vegetation are replaced by dark, low-albedo construction materials like asphalt and concrete, which aggressively trap thermal solar radiation during daytime hours and re-radiate it slowly back into the low atmosphere during the night. Thus, both statements are correct, and R acts as the exact physical mechanism driving A.