8 public questions tagged with this topic.
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
“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
“Bell-shaped” for a stable population age structure is best described as. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Selection favors the schedule that increases lifetime reproductive success under local mortality and resource conditions. Body size, development time, fecundity, parental investment, and generation length consequently tend to covary. The remaining alternatives—“Pyramid”, “Urn-shaped”, “Funnel-shaped”—refer to different states, processes, or scales and therefore do not express t
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
“Declining” for a population with low pre-reproductive individuals and wide post-reproductive base shows. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Selection favors the schedule that increases lifetime reproductive success under local mortality and resource conditions. Body size, development time, fecundity, parental investment, and generation length consequently tend to covary. The remaining alternatives—“Expanding”, “Stable”, “Constant”—refer to different states, processes, or scales and t
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
