8 public questions tagged with this topic.
Immigration refers to the movement of individuals into a population, increasing its size.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Attributes - Birth Death Sex Ratio Age Distribution
High birth rates contribute to population growth, whereas emigration, mortality, and lack of resources lead to population decline.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Attributes - Birth Death Sex Ratio Age Distribution
If birth rate and immigration exceed death rate and emigration, the population size will increase.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Attributes - Birth Death Sex Ratio Age Distribution
Birth rate and death rate are key factors that regulate population growth and size.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Attributes - Birth Death Sex Ratio Age Distribution
Carrying capacity is not constant; it varies based on environmental conditions and resource availability.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Attributes - Birth Death Sex Ratio Age Distribution
“Island distance” for isolation-controlled immigration is affected by. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. At equilibrium, species identities can continue to turn over even when richness is approximately stable. The model predicts a balance of rates, not an absence of colonization or extinction. The remaining alternatives—“Island size”, “Island vegetation”, “Island shape”—refer to different states, processes, or scales and therefore do not express the same causal relationship. Island b
Ref: The Theory of Island Biogeography, MacArthur & Wilson, Ch. 2-4
“Core-satellite metapopulation” for a population that persists due to immigration despite high local extinction rates exemplifies. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. At equilibrium, species identities can continue to turn over even when richness is approximately stable. The model predicts a balance of rates, not an absence of colonization or extinction. The remaining alternatives—“Classical metapopulation”, “Nonequilibrium metapopulation”, “Continuous population”—refer to different st
Ref: Campbell Biology, Urry et al., 12th Ed., Unit 8 Ecology
“Rescue effect” for immigration prevents extinction in a patch; this phenomenon is called. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Island biogeography explains species richness as a dynamic balance between immigration and extinction. Immigration generally declines as an island fills with species, whereas extinction rises as more species divide finite area and maintain smaller populations. The remaining alternatives—“Founder effect”, “Genetic drift”, “Colonization effect”—refer to different
Ref: Campbell Biology, Urry et al., 12th Ed., Unit 8 Ecology
