22 public questions tagged with this topic.
Genetic diversity enables populations to adapt to changing environmental conditions and is essential for evolution.
Ref: NCERT Class 12 Biology Chapter 13: Biodiversity and Conservation Biodiversity - Levels - Genetic Species Ecological
Thick-shelled eggs prevented desiccation, enabling reptiles to dominate terrestrial environments.
Ref: NCERT Class 12 Biology Chapter 6: Evolution Darwinism Lamarckism and Modern Synthetic Theory
Forelimbs of mammals illustrate divergent evolution, where similar structures adapt for different functions.
Ref: NCERT Class 12 Biology Chapter 6: Evolution Adaptive Radiation and Biological Evolution
The organism is a euglenoid. Euglenoids possess a flexible pellicle and two unequal flagella. They photosynthesise in sunlight but behave as heterotrophs by preying on smaller organisms when sunlight is unavailable.
Ref: NCERT Class 11 Biology Chapter 2: Biological Classification Five Kingdom Classification and Kingdom Plantae Animalia
Host–parasite coevolution reflects key principle in quiz on section e solved pyqs, where evolutionary mechanisms shape genetic variation and adaptation. In this context, Host–parasite coevolution 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 Host–parasite coevolution fits helps integrate natural selection, environment.
Ref: Futuyma, Evolution, Variation, Drift, and Speciation Concepts.
Mutations are random reflects key principle in quiz on pyqs-evo theories + genetic drift, where evolutionary mechanisms shape genetic variation and adaptation. In this context, Mutations are random 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 Mutations are random fits helps integrate natural selection, drift and species concepts essential for NEET, CSIR-NET and GATE examinations. This concept integrates genetics, ecology and molecular evidence, frequently tested in NEET, GATE and CSIR-NET, highlighting links between genotype, phenotype
Ref: Hartl & Clark, Principles of Population Genetics, Drift and Effective Size.
Exadaptation reflects key principle in quiz on pyqs-evo theories + genetic drift, where evolutionary mechanisms shape genetic variation and adaptation. In this context, Exadaptation 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 Exadaptation fits helps integrate natural selection, environment.
Ref: Hartl & Clark, Principles of Population Genetics, Drift and Effective Size.
Adaptive evolution reflects key principle in quiz on natural selection, where evolutionary mechanisms shape genetic variation and adaptation. In this context, Adaptive evolution 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 Adaptive evolution fits helps integrate natural selection, environment.
Ref: Futuyma, Evolution, 4th ed., Chapter 11: Natural Selection.
Directional selection shifts population mean toward one extreme when environment changes, favoring novel phenotype such as larger beaks during drought or dark coloration during pollution. It increases frequency of alleles promoting favored extreme, decreasing opposite extreme, driving adaptation and potentially speciation. Peppered moth and Darwin's finches exemplify. This mode is common during colonization or climate change. Therefore it favors Shift in mean trait value, producing evolutionary trend. This concept integrates genetics, ecology and molecular evidence, frequently tested in NEET, GATE and CSIR-NET, highlighting links between genotype, phenotype and environment.
Ref: Futuyma, Evolution, 4th ed., Chapter 11: Natural Selection.
Fittest phenotypes reflects key principle in quiz on natural selection, where evolutionary mechanisms shape genetic variation and adaptation. In this context, Fittest phenotypes 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 Fittest phenotypes fits helps integrate natural selection, environment.
Ref: Futuyma, Evolution, 4th ed., Chapter 11: Natural Selection.
“Adapt to various environmental conditions” for phenotypic plasticity helps invasive species. 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—“Develop specialized diets”, “Occupy narrow habitats”, “Reduce competition”—refer to different states, processes, or scales and therefore do not express the same causal relationship. Effective control reduces propagule pressure or population growth without causing unacceptable non-target effects. Repeated monitoring is necessary because seed banks, dormant stages, recolonization, and density-dependent compensation can reverse short-term gains. 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: NCERT Biology Class 12, Ch. 15 Biodiversity and Conservation
“Minimize overlap” for limited resources cause evolution 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—“Increase overlap”, “Eliminate competition”, “Immediate extinction”—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
