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Home/Anthropology/Mains PYQ/2026/Paper I/Human Genetics & Human Biology
UPSC MainsAnthropology Optional Paper I 2026 15 Marks Model Answer Available

Fertility and Mortality: Biological and Socio-ecological Factors — 2026 Paper I

Question · 2026 · Paper I · 15 Marks

What do you understand by fertility and mortality? How are these influenced by biological and socio-ecological factors?

Model Answer

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Approach

  • Demand of Question: Define fertility and mortality and explain their biological, proximate and socio-ecological determinants.
  • Structuring the Response: Definitions/measures → fertility determinants → Bongaarts/Davis–Blake → mortality determinants → fertility–mortality feedback → conclusion.
  • Key Dimensions to Cover: Fertility vs fecundity, breastfeeding/postpartum amenorrhoea, education/contraception, nutrition, sanitation/healthcare, Omran, demographic feedback.

 

Model Answer

Introduction: Fertility is actual reproductive performance, usually measured through live births, whereas fecundity is the biological capacity to reproduce. Mortality refers to the occurrence of deaths in a population. Demographic anthropology treats both as biocultural outcomes rather than as purely statistical rates.

Measures:

Fertility may be studied through crude birth rate, general fertility rate, age-specific fertility rates and total fertility rate (TFR). Mortality is examined through crude and age-specific death rates, infant mortality, maternal mortality and life expectancy.

Determinants of fertility:

Biological/proximate factors include age at menarche and menopause, ovarian function, sterility, maternal nutritional status, pregnancy loss, breastfeeding and postpartum amenorrhoea, reproductive disease and fecundability.

Davis–Blake and especially Bongaarts showed how wider social conditions influence fertility through proximate mechanisms such as marriage/sexual exposure, contraception, induced abortion and postpartum infecundability. Socio-ecological factors include age at marriage, female education and employment, desired family size, son preference, inheritance rules, infant survival, migration, workload, food security and access to contraception. Prolonged breastfeeding illustrates a direct biocultural pathway: a cultural practice can lengthen birth intervals through lactational amenorrhoea.

Determinants of mortality:

Biological susceptibility varies with age, sex, immunity, genetic predisposition, nutritional status and comorbidity. Socio-ecological conditions—water and sanitation, housing density, food security, occupational hazards, pollution, infectious-disease ecology, poverty, conflict and access to preventive/curative healthcare—shape actual mortality.

Omran’s epidemiologic transition describes the broad shift from mortality dominated by epidemics and infection toward longer life expectancy and a greater relative burden of chronic/degenerative disease, while real populations often experience overlapping transitions.

Fertility and mortality also interact. High infant and child mortality may encourage replacement or “insurance” fertility; sustained mortality decline often precedes fertility decline in demographic transition.

Conclusion: Fertility and mortality are outcomes of biological potential operating through culturally organised and ecologically unequal conditions; they are therefore fundamentally biosocial.

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