7 public questions tagged with this topic.
Interspecific competition occurs when individuals of different species compete for the same limited resources.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Interactions - Mutualism and Amensalism
Two male deer fighting for a mate is an example of intraspecific competition, as both belong to the same species.
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
“Restricting it to a smaller realized niche” for interspecific competition affects chthamalus by. 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—“Increasing its fundamental niche”, “Expanding its habitat range”, “Eliminating predators”—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. 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
“Different species members” for interspecific competition occurs between. 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—“Same species members”, “Predator and prey”, “Parasite and host”—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
When two species draw on the same limiting nutrient, each reduces the amount available to the other. Both populations consequently experience lower growth, survival, or reproduction than they would in the other's absence, producing the (-,-) outcome of interspecific competition. Competitive effects can occur through exploitation of a shared resource or through direct interference, and their strength depends on resource supply, uptake traits, and niche overlap. Mutualism benefits both species, amensalism harms one while leaving the other unaffected, and parasitism benefits one at the other's expense. Resource partitioning or character displacement may lessen competition and permit coexistence over evolutionary or ecological time. The relevant evidence concerns process rather than wording alone. Linking the described pattern to energetic returns, fitness consequences, or receiver responses makes the inference biologically coherent and distinguishes it from the competing alternatives. Ecological categories are simplified models, yet they remain valuable when their assumptions are stated. The selected description captures the dominant net effect, while real systems may vary with density, habitat, life stage, and environmental conditions.
Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 8-13
The stated key is scientifically inconsistent with the wording. Apparent competition occurs when two prey species share a predator, not when two consumers compete for shared prey. Competition for shared prey is ordinarily exploitative competition between predators, but that category is absent from the listed choices. Ecological interaction labels describe causal pathways rather than merely similar outcomes. Two organisms can decline together because they consume the same limiting resource, physically exclude one another, or are connected through a common predator. Experiments distinguish these cases by manipulating resources, access, or enemy abundance. Correct classification matters because coexistence mechanisms also differ: resource partitioning reduces exploitation, spatial separation may reduce interference, and enemy specialization can weaken apparent competition. In this context, the keyed term, Apparent, identifies the relevant mechanism or quantitative relationship and links the observed pattern to its underlying ecological cause. The distinction is testable by measuring changes in organisms, resources, or process rates through time rather than relying on the label alone.
Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 20
