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(a) Which is the simplest domain? Bacteria is the simplest domain because its organisms are unicellular prokaryotes with no nucleus and simple cell structures. (b) Which is the complex domain? Eukarya is the most complex domain because it includes multicellular organisms with complex organelles and well-defined nuclei. (c) Are most bacteria harmful? No, most bacteria … Read more
Feature Two-Kingdom System Three-Kingdom System Five-Kingdom System Proposed By Carolus Linnaeus (1735) Ernst Haeckel (1866) R.H. Whittaker (1969) Number of Kingdoms 2 (Plantae & Animalia) 3 (Plantae, Animalia & Protista) 5 (Monera, Protista, Fungi, Plantae, Animalia) Cell Type No distinction between prokaryotes and eukaryotes Introduced Protista for unicellular organisms Clear distinction between prokaryotes (Monera) and … Read more
(a) Bacteria and Protists: Bacteria: Prokaryotic, unicellular, lack a nucleus, and have peptidoglycan in their cell walls. Protists: Eukaryotic, mostly unicellular, have a nucleus, and lack peptidoglycan. (b) Fungi and Plants: Fungi: Heterotrophic, absorb nutrients, have chitin in their cell walls, and lack chlorophyll. Plants: Autotrophic, perform photosynthesis, have cellulose in their cell walls, and … Read more
The classification into three domains is based on: Differences in ribosomal RNA (rRNA) sequences. Cell structure (prokaryotic or eukaryotic). Presence or absence of peptidoglycan in the cell wall. Membrane lipid composition. Mode of reproduction and genetic material organization. Related Questions: Why are the following scientists famous for? What is a domain? Name the three domains … Read more
A domain is the highest taxonomic rank, classifying life into three groups based on genetic differences: 1. Bacteria – Prokaryotic, single-celled organisms with peptidoglycan in their cell walls. 2. Archaea – Prokaryotic, single-celled organisms that live in extreme environments. 3. Eukarya – Includes all eukaryotic organisms (plants, animals, fungi, protists). Related Questions: Why are … Read more
(a) Biodiversity: The variety of living organisms in a particular habitat or the entire Earth. (b) Classification: The process of grouping organisms based on similarities and differences. (c) Taxonomy: The science of naming, defining, and classifying organisms. (d) Systematics: The study of biological diversity and evolutionary relationships among organisms. (e) Taxa: The hierarchical categories in … Read more
(a) Aristotle: He is known as the “Father of Biology” and classified organisms into plants and animals based on their habitat and structure. (b) Carolus Linnaeus: He introduced the binomial nomenclature system, classifying organisms scientifically with a genus and species name. (c) Carl Woese: He proposed the three-domain classification system based on differences in ribosomal … Read more