VAID'S ICS – Best UPSC Anthropology Coaching in Delhi Since 1985

Comprehensive Classroom Course · Admissions openRegister now
+91 93113 37737
  • +91-93113 37737, +91-99999 46748
  • 73(FF), Old Rajender Nagar Market, Delhi - 110060
  • MON to SUN 9.00 am - 6.00 pm
Facebook Youtube Instagram
Menu
Enquire Now
Home/Anthropology/Mains PYQ/2020/Paper I/Human Genetics & Human Biology
UPSC MainsAnthropology Optional Paper I 2020 15 Marks Model Answer Available

Biocultural Responses to Extreme Climatic Events — 2020 Paper I

Question · 2020 · Paper I · 15 Marks

Describe the biocultural responses to extreme climatic events.

Model Answer

VAID ICS

Approach

  • Demand of Question: Describe biological and cultural mechanisms through which humans respond to extreme climatic stresses.
  • Structuring the Response: Classify responses into immediate physiology, acclimatization, long-term adaptation and cultural strategies, with examples of heat, cold and climatic disasters.

Model Answer

Introduction

Human response to climatic extremes is biocultural, involving interaction between physiological flexibility, genetic adaptation, behaviour, technology and social organization. Extreme heat, cold, drought, floods and climatic variability therefore produce responses at several levels.

Biological responses

  1. Immediate physiological responses: Human bodies respond rapidly to thermal stress.

Under heat stress:

  • vasodilation increases heat loss;
  • sweating promotes evaporative cooling;
  • cardiovascular adjustments maintain body temperature.

Under cold stress:

  • peripheral vasoconstriction reduces heat loss;
  • shivering increases metabolic heat production;
  • non-shivering thermogenesis may contribute to heat generation.

Thus:

Climatic stress → Physiological regulation → Maintenance of homeostasis

Acclimatization

Repeated climatic exposure can produce reversible physiological changes.

Heat acclimatization may involve:

  • earlier onset of sweating;
  • increased sweat efficiency;
  • improved cardiovascular stability;
  • reduced salt loss.

Cold acclimatization may include changes in:

  • peripheral circulation;
  • metabolic response;
  • tolerance to low temperatures.

These responses occur within an individual's lifetime.

Developmental responses

Exposure during growth may influence:

  • body size;
  • body composition;
  • metabolic patterns;
  • maturation.

Such developmental plasticity demonstrates the interaction between environment and phenotype.

Long-term population adaptation

Across generations, natural selection may contribute to population-level adaptations.

Broad ecogeographical observations include:

  • Bergmann's rule: larger body mass is favoured in colder environments because it reduces surface-area-to-volume ratio.
  • Allen's rule: shorter extremities reduce heat loss in cold environments, while longer limbs facilitate heat dissipation in warmer climates.

These represent statistical ecological tendencies rather than rigid laws.

Cultural responses to heat

Human cultural adaptations include:

  • loose and breathable clothing;
  • shaded dwellings;
  • ventilation;
  • altered work schedules;
  • water storage;
  • seasonal mobility;
  • irrigation.

In arid environments, livelihood systems such as pastoral mobility may reduce risks associated with spatially variable rainfall.

Cultural responses to cold

Cold-adapted populations employ:

  • insulated clothing;
  • energy-rich diets;
  • fire;
  • compact shelters;
  • seasonal food storage;
  • specialized hunting technology.

For example, Arctic indigenous communities developed highly effective clothing and housing technologies that reduce heat loss.

Responses to drought and climatic extremes

Extreme climatic events may generate collective adaptations such as:

  1. Mobility: Migration to alternative grazing or livelihood zones.
  2. Food storage: Buffering periods of scarcity.
  3. Crop diversification: Combining drought-resistant crops and multiple varieties.
  4. Social reciprocity: Kinship and exchange networks redistribute food and resources.
  5. Water management: Wells, tanks, irrigation and rainwater harvesting.
  6. Livelihood diversification: Combining agriculture, pastoralism, wage work and forest collection.

Thus:

Environmental uncertainty → Technological + Economic + Social buffering

Social inequality and vulnerability

Biocultural response is not equally available to everyone. Ability to survive climatic extremes varies according to:

  • wealth;
  • housing;
  • nutrition;
  • occupation;
  • age;
  • gender;
  • political marginality.

Hence the same climatic event may produce very different health outcomes among different social groups.

Limits of adaptation

Extreme events can exceed adaptive capacity, leading to:

  • dehydration and heat stroke;
  • hypothermia;
  • famine and malnutrition;
  • infectious disease outbreaks;
  • forced migration.

Modern climate change can also disrupt historically successful local adaptations because the speed and intensity of environmental change may exceed existing cultural coping mechanisms.

Conclusion

Human adaptation to climatic extremes reflects the interaction of physiological regulation, developmental plasticity, population adaptation and cultural innovation. The biocultural approach shows that climatic survival depends as much on technology and social organization as on biological capacity.

2026 Genetic polymorphism and natural selection. 2026 Numerical chromosomal aberrations can be due to abnormalities in autosomes as well as sex chromosomes. Elaborate in terms of the effects these have on human body, giving suitable examples. 2026 Distinguishing features of nuclear and mitochondrial DNA. 2026 How would you find out that a particular disease/disorder is inherited and, if so, in which manner? Elaborate with suitable examples.

Want feedback on your answer?

Join the Anthropology workshop or get structured answer-writing guidance from VAID ICS.

Join Workshop Contact VAID ICS

UPSC Anthropology Optional 2020 — Paper I

28 questions

5(d) Ethics and Genetic engineering

10 Marks150 words
Syllabus: Paper I > 12. Applications of Anthropology > Applied human genetics and eugenics
2020Paper IApplied & Forensic AnthropologyModel answer available

5(c) Experiential Ethnography

10 Marks150 words
Syllabus: Paper I > 8.1 Research Methods > Fieldwork tradition and ethnography
2020Paper IResearch Methods in AnthropologyModel answer available

5(b) Genetic drift

10 Marks150 words
Syllabus: Paper I > 9.3 Mendelian population and Hardy-Weinberg law > Genetic drift
2020Paper IHuman Genetics & Human BiologyModel answer available

1(a) Natufian culture

10 Marks150 words
Syllabus: Paper I > 1.8(b) Cultural Evolution: broad outlines of prehistoric cultures > Mesolithic > Natufian
2020Paper IPrehistoric ArchaeologyModel answer available

5(a) Racism and Eugenics

10 Marks150 words
Syllabus: Paper I > 9.5 Race and racism > Racial differentiation; eugenics
2020Paper IHuman Genetics & Human BiologyModel answer available

1(b) Sapir-Whorf hypothesis

10 Marks150 words
Syllabus: Paper I > 7. Culture, language and communication > Language and thought
2020Paper ICulture & SocietyModel answer available

5(e) Senescence

10 Marks150 words
Syllabus: Paper I > 10. Human growth and development > Ageing and senescence
2020Paper IHuman Genetics & Human BiologyModel answer available

1(d) Victor Turner and Liminality

10 Marks150 words
Syllabus: Paper I > 6. Anthropological Theories > Symbolic Anthropology > Turner; liminality
2020Paper IAnthropological TheoriesModel answer available