21 public questions tagged with this topic.
r-selected species reproduce rapidly, produce many offspring, and provide little or no parental care.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Interactions - Mutualism and Amensalism
K-selected species produce fewer offspring and invest significant parental care to ensure survival.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Interactions - Mutualism and Amensalism
Rats exhibit an r-selected strategy, characterized by high reproductive rates, small body size, and minimal parental care.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Responses to Abiotic Factors - Regulate Conform Migrate Suspend
r-selected species reproduce quickly, grow rapidly, and do not exhibit delayed reproduction.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Organism and Environment - Major Biomes Abiotic Factors
Parental care investment reflects key principle in quiz on section e solved pyqs, where evolutionary mechanisms shape genetic variation and adaptation. In this context, Parental care investment 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 Parental care investment fits helps integrate natural selection,
Ref: Futuyma, Evolution, Variation, Drift, and Speciation Concepts.
Monogamous species reflects key principle in quiz on territory behaviour+pyqs, where evolutionary mechanisms shape genetic variation and adaptation. In this context, Monogamous species 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 Monogamous species fits helps integrate natural selection, environment.
Ref: Krebs & Davies, Behavioural Ecology, Chapter 5: Territoriality.
Greater choosiness reflects key principle in quiz on mating behavior+pyqs, where evolutionary mechanisms shape genetic variation and adaptation. In this context, Greater choosiness 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 Greater choosiness fits helps integrate natural selection, environment.
Ref: Alcock, Animal Behavior, 11th ed., Chapter 11: Mating Systems.
No pair bonds reflects key principle in quiz on mating behavior+pyqs, where evolutionary mechanisms shape genetic variation and adaptation. In this context, No pair bonds 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 No pair bonds fits helps integrate natural selection, environment.
Ref: Alcock, Animal Behavior, 11th ed., Chapter 11: Mating Systems.
Agave stores resources through a long vegetative phase and then commits them to one massive flowering event. After seed production, the flowering rosette dies, so its reproductive schedule is semelparous. The striking stalk and large seed output illustrate terminal investment: accumulated energy is directed toward present reproduction because there is no later breeding episode to preserve. Allocation trade-offs arise because stored carbon, nutrients, time, and physiological capacity are finite. Reproduction can reduce maintenance and future survival, while maintenance can postpone offspring pr
Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 5
Populations described as r-selected often fluctuate widely. Their rapid reproduction permits abrupt increases after rain, disturbance, or release from enemies, but short-lived resources and density-independent events can cause equally abrupt declines. Such populations need not cycle regularly; variable captures their tendency to track unpredictable opportunities rather than remain close to a stable carrying capacity. A survivorship curve is built from a cohort life table by plotting the proportion alive at each age. Type I concentrates mortality late, Type II approximates a constant hazard, an
Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 12
Selection in frequently disturbed or short-lived habitats favors rapid maturation and high early reproductive output because delaying reproduction risks dying before breeding. Semelparity can fit this strategy when one large reproductive effort maximizes offspring production under low adult survival. Rapid development is therefore consistent with the classical r-selected end of the continuum, while large body size and repeated, carefully supported breeding are more often linked with K selection. Survivorship and reproductive schedules are connected through allocation. An organism has finite en
Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 12
Dracaena is treated here as the non-semelparous organism because many species are perennial plants capable of flowering repeatedly. Bamboo, cicadas, and mayflies include familiar examples that invest in a single major reproductive episode or effectively reproduce once before death. Taxonomic names alone can conceal variation, however: semelparity must ultimately be established from the life history of the particular species, not assumed for every member of a genus. The r/K framework is best treated as a continuum. At one end, rapid development and many inexpensive offspring suit transient oppo
Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 12
