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Home/Anthropology/Mains PYQ/2014/Paper I/Human Genetics & Human Biology
UPSC MainsAnthropology Optional Paper I 2014 20 Marks Model Answer Available

Stages of Human Growth — 2014 Paper I

Question · 2014 · Paper I · 20 Marks

What are the different stages of Growth ? Describe any one of them in detail.

Model Answer

VAID ICS

Approach

  • Demand of Question: Identify the major stages of human growth and describe one stage in detail.
  • Structuring the Response: List the stages first, then explain adolescence with its physical, sexual and psychological changes.
  • Key Dimensions to Cover: Prenatal, infancy, childhood, juvenile stage, adolescence, adulthood, growth spurt, puberty and sexual maturation.

Model Answer

Introduction: Human growth is a continuous but uneven process involving changes in body size, proportion, physiology and maturation from conception to adulthood. Different phases are characterized by distinct growth rates and developmental events.

Major stages of growth

  1. Prenatal stage
    • Germinal
    • Embryonic
    • Foetal
  2. Infancy
    • Birth to about 2 years
  3. Childhood
    • Early childhood
    • Middle childhood
  4. Juvenile stage
  5. Adolescence
  6. Adulthood

Thus:

Prenatal → Infancy → Childhood → Juvenile → Adolescence → Adulthood

Adolescence in detail

Adolescence is the transitional stage between childhood and adulthood, marked by rapid physical growth and attainment of sexual maturity.

  1. Adolescent growth spurt

A marked acceleration occurs in:

  • stature;
  • body weight;
  • muscle mass;
  • skeletal dimensions.

Girls generally enter the growth spurt earlier than boys.

  1. Puberty

Puberty involves activation of the hypothalamic-pituitary-gonadal axis, leading to increased secretion of sex hormones.

In girls:

  • breast development;
  • widening of pelvis;
  • appearance of pubic and axillary hair;
  • menarche.

In boys:

  • enlargement of testes and penis;
  • deepening of voice;
  • facial and body hair;
  • increased muscle mass.
  1. Sexual dimorphism

Sex differences become more pronounced during adolescence.

Generally:

  • males develop broader shoulders and greater muscle mass;
  • females develop relatively wider pelvis and greater fat deposition.
  1. Skeletal maturation

Adolescence is associated with:

  • rapid long-bone growth;
  • epiphyseal maturation;
  • eventual fusion of growth plates.
  1. Body composition

Boys generally show increasing lean body mass, while girls show a relatively greater increase in body fat percentage.

  1. Psychological and social changes

Adolescence also involves:

  • identity formation;
  • increased independence;
  • peer-group influence;
  • changing social roles.

Hence adolescence is a biocultural transition, not merely a biological event.

Factors affecting adolescent growth

Growth varies according to:

  • heredity;
  • nutrition;
  • disease;
  • hormones;
  • socioeconomic conditions;
  • physical activity.

Conclusion

Human growth passes through several distinct stages, each characterized by different rates and developmental priorities. Adolescence is particularly significant because it combines the adolescent growth spurt, sexual maturation and transition into adult biological and social status.

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. 2026 What do you understand by fertility and mortality? How are these influenced by biological and socio-ecological factors? 2026 In what manner is our understanding of serogenetics and cytogenetics useful in reproductive biology? What are the major ethical issues involved in reproductive technology?

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UPSC Anthropology Optional 2014 — Paper I

28 questions

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