7 public questions tagged with this topic.
A broad-based triangular age pyramid indicates a high birth rate and a rapidly growing population. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Morphology and Anatomy of Flowering Plants, Topic: Plant structure and tissue systems.
Age structure refers to the relative proportion of individuals in different age groups within a population.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Life History Variations and Population Interactions - Overview
Body mass is a characteristic of an individual, while population attributes include age distribution, sex ratio, and density.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Attributes - Birth Death Sex Ratio Age Distribution
Age distribution helps predict future population growth by showing the proportion of individuals in reproductive and pre-reproductive stages.
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
“No post-reproductive stage” for insects typically have. 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—“Equal reproductive and post-reproductive span”, “Long post-reproductive stage”, “Long reproductive phase”—refer to diff
Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 10
“Rectangular” for which age structure has equal width for all age groups. 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”, “Bell-shaped”, “Urn-shaped”—refer to different states, processes, or scales and therefore do not express the
Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 10
