7 public questions tagged with this topic.
Food availability is a density-dependent factor because it becomes limited as population size increases.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Interactions - Competition - Competitive Exclusion
Natural disasters like floods and earthquakes affect populations regardless of their density, making them density-independent factors.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Interactions - Predation and Herbivory
Mutation rate affects genetic variation but does not directly regulate population density like birth rate, death rate, and migration.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Attributes - Birth Death Sex Ratio Age Distribution
Adaptation is an evolutionary process rather than a direct factor in regulating population size, unlike natality, mortality, and migration.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Adaptations - Morphological Physiological Behavioural
Mutation affects genetic variation but does not directly influence population growth like natality, mortality, and migration.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Responses to Abiotic Factors - Regulate Conform Migrate Suspend
Food availability depends on population density, whereas natural disasters are density-independent factors.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Responses to Abiotic Factors - Regulate Conform Migrate Suspend
Population regulation requires negative feedback: as density rises, processes such as competition, disease, predation, or territorial exclusion reduce per-capita birth rates or raise per-capita death rates. This feedback slows growth at high density and tends to return abundance toward an equilibrium or range. Constant rates alone describe population change but do not create a restoring mechanism. Demographic mechanisms are linked by the balance dN/dt = births + immigration - deaths - emigration. Density-dependent changes in any of these terms can alter net growth. To infer regulation, ecologi
Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 5
