4 public questions tagged with this topic.
Biotic potential is the highest possible reproductive capacity of a species when environmental conditions are optimal.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Organism and Environment - Major Biomes Abiotic Factors
“Number of species present” for species richness refers specifically to. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Larger islands usually support more habitats and larger populations, lowering extinction risk; less isolated islands receive colonists more readily and may experience rescue effects. These mechanisms also apply to habitat fragments that function as ecological islands. The remaining alternatives—“Genetic variation”, “Population density”, “Biomass of organisms”—refer to different states, processes, or scales and therefore do not express the same causal relationship. 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. This distinction matters because similar surface patterns can arise through different mechanisms, whereas ecological prediction depends on identifying the mechanism that actually changes rates. The cited framing is therefore most useful when treated as a conditional biological claim, with assumptions about scale and environmental context kept explicit.
Ref: Biogeography, Lomolino et al., 5th Ed., Ch. 5-8
“Range of niche dimensions occupied” for niche breadth is defined as. 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—“Complete niche overlap”, “Only food resource utilization”, “Spatial distribution only”—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
An ecotype is a genetically differentiated population within a species that is adapted to a particular set of local environmental conditions. Selection in contrasting climates, soils, elevations, salinities, or disturbance regimes can produce inherited differences in flowering time, growth form, physiology, or tolerance. These traits persist when populations are grown in a common environment, demonstrating that they are not merely temporary environmental effects. Gene flow may still occur among ecotypes, so they are not necessarily separate species, but selection maintains geographic differentiation. An ecad is the contrasting concept: a plastic phenotype induced by environment that generally disappears when conditions change and lacks stable genetic fixation. Ecosystem-specific community and invasive species refer to different levels of ecological organization and origin, not an intraspecific hereditary variety. Reciprocal-transplant experiments provide strong evidence: each ecotype often performs best in its home habitat, revealing local adaptation and fitness trade-offs. Calling the form “permanent” means inherited across generations under the ecological classification, not immutable; continued gene flow, drift, or environmental change can alter ecotype boundaries and trait frequencies.
Ref: NCERT Biology Class 12, Ch. 15 Biodiversity and Conservation
