11 public questions tagged with this topic.
A broad base in an age pyramid indicates a high birth rate and a rapidly growing population.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Attributes - Birth Death Sex Ratio Age Distribution
An age pyramid represents the proportion of individuals in different age groups within a population, providing insights into its growth trend.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Attributes - Birth Death Sex Ratio Age Distribution
A bell-shaped age pyramid indicates a stable population, where birth and death rates are balanced.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Attributes - Birth Death Sex Ratio Age Distribution
An inverted age pyramid indicates a declining population, with a higher number of post-reproductive individuals and fewer young individuals.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Attributes - Birth Death Sex Ratio Age Distribution
A declining age pyramid has more post-reproductive individuals, indicating a shrinking population due to low birth rates.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Attributes - Birth Death Sex Ratio Age Distribution
A bell-shaped age pyramid represents a stable population with nearly equal birth and death rates.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Attributes - Birth Death Sex Ratio Age Distribution
An expanding age pyramid has a broad base, indicating a high proportion of pre-reproductive individuals.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Responses to Abiotic Factors - Regulate Conform Migrate Suspend
“Declining birth rate” for a sharply narrowing base in an age pyramid indicates. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Life-history traits reflect allocation among growth, maintenance, survival, and reproduction. Energy invested in many offspring cannot simultaneously be invested in large offspring, prolonged care, or future breeding, creating measurable trade-offs. The remaining alternatives—“High natality”, “High mortality in old age”, “Overpopulation”—refer to different states, proces
Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 10
“Stable” for in an age pyramid, equal pre-reproductive and reproductive population with small post-reproductive group indicates. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Life-history traits reflect allocation among growth, maintenance, survival, and reproduction. Energy invested in many offspring cannot simultaneously be invested in large offspring, prolonged care, or future breeding, creating measurable trade-offs. The remaining alternatives—“Rapidly growing”, “Declining”, “Unstructured”—r
Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 10
“Post-reproductive” for in an age pyramid, which age group is at the top. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Survivorship curves summarize age-specific mortality: Type I concentrates loss late in life, Type II approximates a constant hazard, and Type III concentrates loss early. They are empirical patterns, not rigid taxonomic rules. The remaining alternatives—“Pre-reproductive”, “Reproductive”, “Juvenile”—refer to different states, processes, or scales and therefore do not express th
Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 10
“Stable population” for in an age pyramid, a bell shape indicates. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Life-history traits reflect allocation among growth, maintenance, survival, and reproduction. Energy invested in many offspring cannot simultaneously be invested in large offspring, prolonged care, or future breeding, creating measurable trade-offs. The remaining alternatives—“Expanding population”, “Diminishing population”, “No reproduction”—refer to different states, processes, or s
Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 10
