9 public questions tagged with this topic.
r-selected species, like bacteria, reproduce rapidly with little parental care, while K-selected species, like elephants and whales, have slower reproduction.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Responses to Abiotic Factors - Regulate Conform Migrate Suspend
A species is a group of individual organisms with fundamental similarities. Distinct morphological differences are used to distinguish one closely related species from another.
Ref: NCERT Class 11 Biology Chapter 1: The Living World Taxonomical Aids - Herbarium and Botanical Gardens
Kingdom is the highest and broadest category among the given options. It includes organisms belonging to different phyla or divisions and therefore contains the greatest number of species.
Ref: NCERT Class 11 Biology Chapter 1: The Living World Taxonomic Categories - Family Order Class Phylum Kingdom
Species is a lower and more specific category than genus. Members of lower taxa share more characteristics than members grouped at higher taxonomic levels.
Ref: NCERT Class 11 Biology Chapter 1: The Living World What is Living? Characteristics of Living Organisms
As one moves from species towards kingdom, categories become broader and include more organisms, while the number of common characteristics decreases. Relationships at higher ranks are also more difficult to determine.
Ref: NCERT Class 11 Biology Chapter 1: The Living World What is Living? Characteristics of Living Organisms
As one moves from species towards kingdom, the categories become broader and the number of common characteristics decreases. Determining relationships among taxa at higher levels also becomes more difficult.
Ref: NCERT Class 11 Biology Chapter 1: The Living World What is Living? Characteristics of Living Organisms
Type concept anchors nomenclature to physical evidence. Holotype is the single specimen, culture, or illustration explicitly designated by author as name-bearing type in protologue at time of original publication. It must be deposited in recognized herbarium, museum, or culture collection with accession number. Isotype represents duplicate of holotype, lectotype selected later from original material when holotype missing, neotype designated when all original material lost. Holotype ensures objective reference, preventing subjective interpretation during taxonomic revision and synonymy resolution. Conservation strategies built on this knowledge support national biodiversity targets and sustainable livelihood planning for local communities.
Ref: ICN Article 9.1 Holotype Definition; NCERT Class 11 Chapter 1 Herbarium Type Specimens
The keyed exception is “Endemic species.” In the context of which of these terms does not refer to invasive species, that statement differs from the governing ecological pattern and must be evaluated against the mechanism rather than accepted from wording alone. Management outcomes depend on scale and context: suppressing abundance at one site does not guarantee regional eradication when dispersal reconnects treated and untreated populations. The remaining alternatives—“Alien species”, “Exotic species”, “Non-native species”—refer to different states, processes, or scales and therefore do not express the same causal relationship. 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 cited framing is therefore most useful when treated as a conditional biological claim, with assumptions about scale and environmental context kept explicit. Linking the wording to measurable consequences for fitness, abundance, or flux gives the conclusion its scientific meaning and prevents a purely mnemonic interpretation.
Ref: NCERT Biology Class 12, Ch. 15 Biodiversity and Conservation
As we ascend the taxonomic hierarchy, the number of shared characteristics decreases. A Phylum is a very high-level category grouping immensely diverse organisms (e.g., humans and fish in Chordata) based on just a few basic features. Therefore, determining precise relationships among them is much more difficult than comparing closely related organisms within a single Genus.
Ref: NCERT Class 11 Biology
