8 public questions tagged with this topic.
r-selected species focus on rapid reproduction and minimal parental care, unlike K-selected species.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Interactions - Parasitism and Commensalism
Parallel evolution occurs when species in different geographical areas evolve similar traits independently.
Ref: NCERT Class 12 Biology Chapter 6: Evolution Adaptive Radiation and Biological Evolution
The keyed exception is “Less likely to invade species-rich ecosystems.” In the context of characteristic generally not true for invasive species, that statement differs from the governing ecological pattern and must be evaluated against the mechanism rather than accepted from wording alone. Species management must identify the demographic stage and ecological process that most strongly limits population growth. Prevention, early detection, removal, habitat manipulation, and biological control act at different points in an invasion or recovery trajectory. The remaining alternatives—“Greater phe
Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 21
“Invasive” for high dispersal ability and competitive ability species likely become. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Species management must identify the demographic stage and ecological process that most strongly limits population growth. Prevention, early detection, removal, habitat manipulation, and biological control act at different points in an invasion or recovery trajectory. The remaining alternatives—“Endangered”, “Dominant”, “Specialist”—refer to different states, process
Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 21
Generalists have broad niches: they can use many resource types, occupy varied habitats, or tolerate a wide range of environmental conditions. This flexibility buffers them against fluctuations in any single resource and often helps them colonize disturbed or novel environments. Examples include omnivores with diverse diets and plants capable of growing across broad soil or light conditions. A broad niche does not mean equal performance everywhere; generalists may still have optimal conditions and may trade peak efficiency for flexibility. Specialists use a narrower set of conditions or resour
Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 13
“Less extinction prone” for an organism with low variability in population size is. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. The mechanism should be evaluated across both local and global scales. Local disappearance can be reversed by recolonization, whereas global extinction is irreversible and requires the loss of every surviving population. The remaining alternatives—“Highly extinction prone”, “Genetically unstable”, “Unable to adapt”—refer to different states, processes, or scales and t
Ref: Conservation Biology, Primack & Sher, 6th Ed., Ch. 7
“Narrow habitat range” for which species trait increases susceptibility to extinction. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Human-driven habitat conversion, exploitation, introduced enemies, pollution, and climate change often interact rather than acting independently. Traits such as slow reproduction or ecological specialization can magnify vulnerability. The remaining alternatives—“Generalized diet”, “High reproductive rate”, “High dispersal ability”—refer to different states, process
Ref: Conservation Biology, Primack & Sher, 6th Ed., Ch. 7
High fecundity is characteristic of many r-selected species that dominate early succession. Disturbed habitats are open, temporary, and unpredictable, so natural selection favours organisms that reproduce quickly and produce many offspring capable of reaching new patches. Seeds or propagules are often small, dispersive, and short-generation, allowing rapid population increase when light and nutrients are abundant. Investment in numerous offspring usually trades off against large body size, prolonged parental care, durable tissues, and late reproduction. Long life span and slow maturation are m
Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 20
