34 public questions tagged with this topic.
Intraspecific competition occurs among individuals of the same species competing for limited resources.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Interactions - Mutualism and Amensalism
Competition occurs when two species compete for limited resources, negatively affecting both.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Interactions - Parasitism and Commensalism
Resource partitioning promotes coexistence by reducing direct competition, not preventing it.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Interactions - Competition - Competitive Exclusion
The competitive exclusion principle states that two species cannot coexist indefinitely if they compete for the same limiting resource.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Interactions - Competition - Competitive Exclusion
Competition occurs when two species compete for limited resources, negatively affecting both species.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Interactions - Predation and Herbivory
Invasive species often thrive because they lack natural predators, allowing them to spread rapidly and outcompete native species.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Interactions - Predation and Herbivory
Territoriality is occupation and exclusive defense of area against conspecifics to secure resources like food, mates or nesting sites, differing from home range which is undefended. Benefits include exclusive resource access, costs involve time and energy for patrolling and aggression. Optimal territory size maximizes net benefit. Defense via song, scent marking, visual displays and aggression maintains boundaries. This behavior illustrates resource defense theory central to behavioral ecology. Hence Spacing individuals defines area defense strategy. This concept integrates genetics, ecology and molecular evidence, frequently tested in NEET, GATE and CSIR-NET, highlighting links between genotype, phenotype and
Ref: Krebs & Davies, Behavioural Ecology, Chapter 5: Territoriality.
Sexual selection, proposed by Darwin in 1871, favors traits increasing mating success rather than survival, via intrasexual competition among same sex and intersexual choice where choosier sex, often females investing more in gametes, selects mates. It explains elaborate ornaments, good genes indicators like MHC diversity and parasite resistance per Hamilton-Zuk hypothesis. Fisherian runaway and handicap principles describe coevolution of preference and trait. Therefore Weapons describes process enhancing reproductive rather than viability fitness. This concept integrates genetics, ecology and molecular evidence, frequently tested in NEET, GATE and CSIR-NET, highlighting links between genotype, phenotype and environment.
Ref: Andersson, Sexual Selection, Princeton, Mate Choice and Good Genes.
Struggle for existence reflects key principle in quiz on theory of evolution, where evolutionary mechanisms shape genetic variation and adaptation. In this context, Struggle for existence aligns with experimental and theoretical evidence from population genetics, behavioral ecology and molecular phylogeny. Textbooks like Campbell Biology, Futuyma Evolution and Hartl Principles illustrate supporting data. Understanding why Struggle for existence fits helps integrate natural selection, environment.
Ref: Campbell Biology, 12th ed., Chapter 22: Descent with Modification.
“Compression of realized niche” for competition typically causes. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. A niche is the multidimensional set of abiotic conditions, resources, and biotic relationships under which a population can persist. The fundamental niche reflects physiological and resource limits, while the realized niche is modified by competitors, consumers, mutualists, and dispersal barriers. The remaining alternatives—“Expansion of fundamental niche”, “Increased genetic diversity”, “Decreased genetic diversity”—refer to different states, processes, or scales and therefore do not express the same causal relationship. Niche differentiation reduces overlap by separating species along resource, space, or time axes. Such partitioning can stabilize coexistence when each species performs relatively better under the conditions it uses most strongly. Field observations could test this account by measuring the proposed driver and the demographic or ecosystem response while controlling plausible confounding factors.
Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 13
“Smaller realized niches” for weak competitors typically have. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Niche differentiation reduces overlap by separating species along resource, space, or time axes. Such partitioning can stabilize coexistence when each species performs relatively better under the conditions it uses most strongly. The remaining alternatives—“Larger realized niches”, “Equal fundamental niches”, “No niches”—refer to different states, processes, or scales and therefore do not express the same causal relationship. Habitat describes where an organism occurs; niche additionally describes how it obtains resources and affects or responds to other organisms. Distribution therefore provides evidence about a niche but is not identical to it. Field observations could test this account by measuring the proposed driver and the demographic or ecosystem response while controlling plausible confounding factors. This distinction matters because similar surface patterns can arise through different mechanisms, whereas ecological prediction depends on identifying the mechanism that actually changes rates.
Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 13
“Reduction in resource overlap” for niche partitioning primarily occurs due to. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Habitat describes where an organism occurs; niche additionally describes how it obtains resources and affects or responds to other organisms. Distribution therefore provides evidence about a niche but is not identical to it. The remaining alternatives—“Increased competition”, “Genetic mutations”, “Climate changes”—refer to different states, processes, or scales and therefore do not express the same causal relationship. A niche is the multidimensional set of abiotic conditions, resources, and biotic relationships under which a population can persist. The fundamental niche reflects physiological and resource limits, while the realized niche is modified by competitors, consumers, mutualists, and dispersal barriers. The cited framing is therefore most useful when treated as a conditional biological claim, with assumptions about scale and environmental context kept explicit.
Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 13
