An ecosystem is fundamentally defined as a community comprising living organisms, known as biotic components, such as plants, animals, and microorganisms, interacting with their non-living physical environment, referred to as abiotic components, which include elements like minerals, climate, soil, sunlight, and water. These components are intricately linked through various interrelationships, where they exchange energy and nutrients. For instance, plants utilize sunlight, water, and minerals for photosynthesis, providing food for herbivores, which in turn become food for carnivores. Decomposers then break down dead organic matter, returning nutrients to the soil. This continuous interaction facilitates the flow of energy and the cycling of matter within a defined area. Ecosystems can vary greatly in size and complexity, ranging from a small pond to a vast forest or grassland, and can be broadly categorized into terrestrial (like forests, grasslands, deserts) and aquatic (like oceans, rivers, lakes) types. The health and stability of an ecosystem depend on the delicate balance and intricate web of these biotic and abiotic interactions.
- Cellular organization
- Nutrition
- Respiration
- Metabolism
- Movement
- Reproduction
- Excretion
- Homeostasis
The mating between different species typically results in sterile offspring because the maternal and paternal chromosomes contributed by the two distinct species are not identical. During meiosis, which is the process of gamete formation, homologous chromosomes need to pair up precisely. However, in hybrid offspring from interspecies mating, the chromosome sets from each parent species are often different in number, structure, or gene sequence. This dissimilarity prevents the proper pairing of homologous chromosomes during prophase I of meiosis. Consequently, the meiotic division cannot proceed correctly, leading to the failure to produce viable gametes. Without functional gametes, the offspring, such as a mule (a hybrid of a horse and a donkey), is reproductively sterile, unable to produce its own offspring.
Classification of living organisms is essential for several fundamental reasons. First, it allows us to identify and differentiate closely related species that may appear similar in morphology or behavior, making it possible to distinguish between them based on specific characteristics. Second, classification helps us understand the variation that exists among different species, revealing the diversity of life forms and their unique adaptations to various environments. Third, it provides a framework for understanding the evolution of species by showing how organisms have changed and diverged over time from common ancestors. Fourth, classification enables us to create a phylogenetic tree among different groups, which represents the evolutionary relationships and ancestry patterns among organisms. Finally, classification provides a convenient and systematic method for studying living organisms by organizing them into hierarchical categories, making it easier for scientists and students to locate information, compare characteristics, and conduct research on specific groups of organisms.
Molecular tools are increasingly utilized in taxonomy due to their high accuracy and authenticity in revealing evolutionary relationships and genetic differences among organisms. These tools primarily involve the analysis of nucleic acids (DNA and RNA) and proteins. By comparing specific gene sequences, such as ribosomal RNA or mitochondrial DNA, scientists can precisely determine the genetic relatedness between species, even when morphological features are very similar or divergent. This approach provides an objective and quantitative measure of evolutionary divergence, allowing for the construction of more robust phylogenetic trees. Molecular data can resolve ambiguities in traditional morphological classifications, identify cryptic species that are morphologically indistinguishable, and provide insights into the evolutionary history that might not be evident from external characteristics alone.
- Identifying, describing, naming, arranging, preserving, and documenting the organisms.
- Investigating the evolutionary history of the species, their adaptations to the environment, and the interrelationship among species.
A phylogenetic tree is a diagrammatic representation of the evolutionary relationships among different organisms or groups of organisms. It is constructed using a tree-like diagram called a cladogram, which shows how different species are related to each other through common ancestors. The branches of the tree represent lineages of organisms, and the points where branches split indicate divergence events where ancestral species split into two or more descendant species. The structure of a phylogenetic tree reflects the evolutionary history and relatedness of organisms, with organisms that share more recent common ancestors positioned closer together on the tree.
Aristotle's classification system, while groundbreaking for its time, possessed significant limitations primarily because it relied on superficial morphological characteristics and habitat for categorization, rather than deeper anatomical or evolutionary relationships. One major drawback was its inability to accommodate organisms that change their form or habitat during their life cycle. For instance, frogs, which are amphibians, have lungs as adults and live on land, but their larval stage, the tadpole, is aquatic and respires through gills. Aristotle's method struggled to classify such organisms consistently. Furthermore, his system often grouped entirely unrelated organisms based on a single shared, superficial trait. For example, all flying organisms, including birds, bats, and flying insects, were grouped together, despite their vast anatomical and evolutionary differences. Conversely, organisms that shared a common ancestry but lacked a specific superficial trait were misclassified or excluded; flightless birds like ostriches, emus, and penguins, which are fundamentally birds, could not be adequately classified by a system that primarily considered flight as a defining characteristic for aerial animals. These limitations highlight that Aristotle's classification lacked a natural or phylogenetic basis, leading to artificial groupings and difficulties in classifying diverse life forms accurately.
The three domains of life, proposed by Carl Woese, represent a higher taxonomic rank than kingdoms and fundamentally indicate a major evolutionary divergence among all living organisms. This system emphasizes the separation of prokaryotes into two distinct domains: Archaea and Bacteria. The third domain is Eukarya, which includes all eukaryotic organisms. While both Archaea and Bacteria are prokaryotic, meaning they lack a membrane-bound nucleus and organelles, they differ significantly in their genetic makeup, cell wall composition, and metabolic pathways. Archaea are often found in extreme environments and have unique ribosomal RNA sequences, distinguishing them from Bacteria. The Eukarya domain encompasses all organisms whose cells contain a nucleus and other membrane-bound organelles, including protists, fungi, plants, and animals. This three-domain system provides a more accurate reflection of evolutionary relationships than the traditional five-kingdom system.
Numerical taxonomy is a quantitative approach to classification that involves the evaluation of resemblances and differences among organisms through the application of statistical methods. This method relies on computer analysis to process large amounts of morphological, biochemical, and genetic data from different organisms. The primary objective of numerical taxonomy is to establish the numerical degree of relationship among organisms, which helps determine how closely related different species are to each other. By using mathematical and statistical techniques, numerical taxonomy provides an objective and reproducible way to classify organisms based on measurable characteristics, reducing the subjectivity that may be present in traditional classification methods. This approach has become increasingly important with the advancement of molecular techniques, allowing scientists to compare organisms at the genetic level and create more accurate classifications that reflect true evolutionary relationships.
- Kingdom
- Phyla
- Class
- Order
- Family
- Genus
- Species
A species is generally defined as a group of individual organisms that possess similar morphological, anatomical, biochemical, and genetic characteristics. Crucially, according to the biological species concept, members of a species are capable of interbreeding naturally with one another to produce fertile offspring. They are reproductively isolated from other such groups, meaning they cannot successfully interbreed with individuals from different species to produce viable, fertile progeny under natural conditions. This reproductive isolation is a key criterion. Species represent the fundamental unit of classification in taxonomy, forming distinct gene pools that maintain their identity over generations.
Cladistic classification, also known as phylogenetics, is a method of classifying organisms based on their evolutionary relationships, specifically by identifying shared derived characters, or synapomorphies. The primary goal is to group organisms into clades, which are monophyletic groups consisting of an ancestral species and all of its descendants. This method constructs phylogenetic trees, or cladograms, which visually represent the branching patterns of evolutionary divergence. Unlike traditional classification systems that might group organisms based on overall similarity, cladistics strictly adheres to evolutionary ancestry, ensuring that all members of a group share a common ancestor that is not an ancestor of any species outside the group. It focuses on the recency of common ancestry to establish natural groupings.
In the hierarchical system of biological classification, an order is a taxonomic rank that represents an assemblage of one or more related families. Organisms grouped within the same order share a few fundamental common features, which are typically broader and less specific than the characteristics defining a family. It is a more inclusive category than a family but less inclusive than a class. For example, the family Canidae, which includes dogs, wolves, and foxes, and the family Felidae, which comprises cats, lions, and tigers, are both placed together in the order Carnivora. This grouping is based on their shared carnivorous diet and associated anatomical adaptations, despite distinct differences that separate them into their respective families.
In the taxonomic hierarchy, a class is a major classification rank that includes one or more related orders sharing a set of common characters. These shared characteristics are typically more general and fundamental than those defining an order or family, reflecting a broader evolutionary relationship. A class is positioned above an order and below a phylum. For instance, the class Mammalia encompasses various orders such as Primates (monkeys, apes, humans), Carnivora (dogs, cats), Rodentia (rats, mice), and Cetacea (whales, dolphins). All members of the class Mammalia share defining characteristics like the presence of mammary glands, hair on their bodies, and being warm-blooded, despite the significant diversity among their constituent orders.
In the biological classification system, a phylum is a major taxonomic rank that groups together one or more related classes sharing similar distinctive characteristics. These characteristics represent fundamental body plans or organizational features that indicate a common evolutionary origin. A phylum is a broader category than a class but narrower than a kingdom. For example, the phylum Chordata includes diverse classes such as Pisces (fishes), Amphibia (amphibians), Reptilia (reptiles), Aves (birds), and Mammalia (mammals). All these classes are unified within the phylum Chordata by the presence of a notochord, a dorsal hollow nerve cord, pharyngeal gill slits, and a post-anal tail at some stage of their development, even though they exhibit significant differences at the class level.
The Animal Kingdom, formally known as Kingdom Animalia, is the highest taxonomic rank that encompasses all living animals belonging to various phyla. It is a vast and diverse kingdom characterized by several key features. Animals are multicellular, eukaryotic organisms that are heterotrophic, meaning they obtain nutrients by consuming other organisms. Their cells typically lack cell walls, and most animals are motile at some stage of their life cycle. Reproduction is predominantly sexual, involving the fusion of gametes. This kingdom includes an immense variety of life forms, from simple sponges to complex vertebrates like mammals, all sharing these fundamental characteristics that distinguish them from plants, fungi, and other forms of life.
- Morphology
- Genetic information
- Habitat
- Feeding pattern
- Adaptations
- Evolutions
A species is generally defined as a group of individual organisms that possess similar morphological, anatomical, biochemical, and genetic characteristics. Crucially, according to the biological species concept, members of a species are capable of interbreeding naturally with one another to produce fertile offspring. They are reproductively isolated from other such groups, meaning they cannot successfully interbreed with individuals from different species to produce viable, fertile progeny under natural conditions. This reproductive isolation is a key criterion. Species represent the fundamental unit of classification in taxonomy, forming distinct gene pools that maintain their identity over generations.
Taxonomical keys are essential tools used for the identification of unknown organisms based on their observable characteristics. These keys are constructed on the principle of comparative analysis, highlighting both the similarities and dissimilarities among different organisms. Typically, a key presents a series of choices, often in the form of a couplet, where each statement offers two contrasting characters. By making a choice between these two statements, the user is led to another set of choices until the organism is identified to a specific taxonomic category. Separate keys are specifically designed for different taxonomic ranks, such as species, genera, or families, ensuring precise identification.
Species and genus are two distinct taxonomic ranks that differ in their definition and hierarchical position. A species is defined as a group of interbreeding populations that share similar morphological, physiological, and genetic characteristics and are capable of producing fertile offspring together. Species represents the basic and most fundamental unit of biological classification. For example, Felis domestica is the scientific name where Felis is the genus and domestica is the species. In contrast, a genus is a taxonomic rank that groups together related species that share common characteristics and are believed to have evolved from a common ancestor. A genus is positioned at the second level in the hierarchical classification system, above species. For example, the genus Felis includes several species such as Felis domestica (domestic cat), Felis margarita (sand cat), and Felis catus, among others. While a species is a reproductive unit where members can interbreed, a genus is a broader grouping based on evolutionary relationships and shared characteristics among multiple species.
Zoological parks, commonly known as zoos, are dedicated facilities where various species of wild animals are maintained within protected enclosures under careful human supervision. The primary objectives of these parks extend beyond mere exhibition; they serve as crucial centers for studying the animals' diverse food habits, intricate behaviors, and reproductive patterns. Furthermore, zoological parks play a vital role in ex-situ conservation efforts, particularly for endangered species, through captive breeding programs. They also contribute significantly to public education, fostering awareness and empathy towards wildlife, and supporting scientific research aimed at understanding and preserving biodiversity.
The binomial system of nomenclature is a standardized method for naming organisms, assigning each species a unique scientific name composed of two parts: a generic name and a specific epithet (species name). This system was famously introduced by Carolus Linnaeus. For instance, Pavo cristatus is the scientific name for the Indian pea fowl. According to this system, the generic name always begins with a capital letter, while the specific epithet starts with a small letter. Both parts are typically italicized when typed or underlined separately when handwritten. This universal system eliminates ambiguity and confusion caused by common names, ensuring that scientists worldwide refer to the same organism by a single, internationally recognized name, thereby facilitating clear communication in biological studies.
- Identification cards
- Description
- Field guides
- Manuals
The trinomial system of nomenclature is an extension of the binomial system, used when there is a need to distinguish between subspecies within a particular species. This system assigns three names to an organism: the generic name, the specific epithet (species name), and a third name representing the subspecies. For example, Corvus splendens splendens refers to the Indian house crow, where Corvus is the genus, splendens is the species, and the second splendens denotes the nominate subspecies. This system is particularly useful in zoology for classifying populations that show distinct morphological or geographical variations but are still capable of interbreeding. It provides a more precise classification for organisms exhibiting significant intraspecific diversity, allowing for finer distinctions within a species without creating entirely new species classifications.
A shared character is a trait or feature that is present in two or more different lineages, indicating a common evolutionary origin. These characters are crucial in phylogenetic analysis as they suggest a shared ancestry between the organisms possessing them. For example, the presence of a vertebral column is a shared character among all vertebrates, implying that they all descended from a common ancestor that possessed this feature. Shared characters can be further categorized as ancestral (plesiomorphic) if they were present in the distant common ancestor of a larger group, or derived (apomorphic) if they evolved more recently within a specific lineage. Understanding shared characters helps scientists to reconstruct evolutionary relationships and build phylogenetic trees.
A derived character, also known as an apomorphy, is an evolutionary novelty that originated in a specific lineage and is not present in the common ancestor of a larger group. It represents a new trait that evolved within the lineage leading up to a particular clade, distinguishing that clade from its ancestral forms and other related groups. For instance, the presence of feathers is a derived character unique to birds, distinguishing them from other reptiles from which they evolved. Similarly, hair and mammary glands are derived characters for mammals. These unique traits are particularly valuable in cladistics for defining monophyletic groups and establishing precise evolutionary relationships, as they indicate a shared ancestry among the members of the clade where the character first appeared.
Vandaloor Zoological Park is one of the most significant zoological parks in India, located in the south-western part of Chennai in Tamil Nadu. The park spreads over an extensive area of approximately 1500 acres, making it one of the largest zoological parks in the country. It houses a remarkable collection of 2553 species representing both flora and fauna, providing visitors and researchers with an opportunity to observe diverse plant and animal species. The zoo plays an important role in wildlife conservation, education, and research, serving as a center for breeding endangered species and promoting awareness about biodiversity and the importance of protecting natural habitats. The park is designed to provide animals with environments that closely resemble their natural habitats, contributing to animal welfare and conservation efforts in India.
- Evolutionary history.
- Environmental adaptations.
- Environmental relationship.
- The interrelationship between species.
- In his book ‘History of Animals,’ he classifies plants and animals into two categories.
- Based on locomotion walking, flying, swimming,
- He classifies the organisms on the basis of blood.
- He classifies the animals into two as ‘Enaima’ with blood and those without blood as’ Anaima’
The five-kingdom classification system was developed by R.H. Whittaker, a prominent American ecologist and botanist. This classification system represents a major advancement in taxonomy and is based on several important criteria including cell structure, mode of nutrition, mode of reproduction, and phylogenetic relationships among organisms. The five kingdoms recognized in Whittaker's system are Monera, which includes prokaryotic organisms such as bacteria and cyanobacteria; Protista, which comprises unicellular eukaryotic organisms; Fungi, which includes organisms that obtain nutrition through absorption; Plantae, which contains photosynthetic organisms with cell walls; and Animalia, which includes multicellular heterotrophic organisms. This classification system replaced earlier systems and provided a more comprehensive framework for organizing the diversity of life on Earth based on fundamental biological characteristics and evolutionary relationships.
- This frog has shiny purple skin.
- There is a light blue ring around the eyes.
- It has a pointy big nose.
- It’s Zoological name Nasikabatrachus Bhupathi.
The scientific name should be italicized in printed form and the generic name and specific name should be underlined separately if it is handwritten.
* The first alphabet of the generic name should be of uppercase.
* The specific name (species) should be in lower case letters.
* The name or abbreviated name of the scientist who first published the scientific name may be written after the specific (species) name along with the year of publication, e.g. Felis Leo Linn., 1958.
* If the specific (species) name is framed after any person’s name, the name of the species shall end with i, ii or ae. e.g. Ground – dwelling lizard Cyrtodactylus varadgiri.
Automated species identification tools, often referred to as cyber tools, leverage advanced technologies like artificial intelligence, machine learning, and image recognition to rapidly and accurately identify species. These systems typically analyze various morphological features, such as wing venation patterns, body shape, color, or even genetic markers, captured through digital images or sensors. Examples include ALIS (Automated Leafhopper Identification System), which focuses on leafhopper morphology; DAISY (Digital Automated Identification System), a broader platform; and ABIS (Automatic Bee Identification System), specialized for bees. SPIDA (Species Identified Automatically) uses characters from spiders, wasps, and bee wings, while Draw wing is specifically for honey bee wing identification. These tools significantly enhance the speed and efficiency of biodiversity surveys, ecological monitoring, and pest management, reducing the reliance on expert taxonomists and making identification more accessible.
d. All the above
b. Taxon
a. Taxon
a. Primata
a. Taxonomic Key
a. Walter Rosen
b. Evolutionary and Phylogenetic
a. DNA and RNA
Probiotics and pathogenic bacteria represent two contrasting groups of microorganisms based on their interaction with host organisms. Probiotics are beneficial microorganisms, primarily bacteria, that, when consumed in adequate amounts, confer a health benefit on the host. They are often found in fermented foods like curd, where species like Lactobacillus convert milk into curd through fermentation, aiding digestion and improving gut health. Probiotics can also enhance the immune system, produce vitamins, and inhibit the growth of harmful bacteria. In contrast, pathogenic bacteria are microorganisms that cause diseases in plants, animals, and humans. They achieve this by invading host tissues, producing toxins, or disrupting normal physiological functions. Examples of diseases caused by pathogenic bacteria include Anthrax, Tuberculosis, Pneumonia, and Tetanus in humans, and various bacterial blights and wilts in plants, such as those caused by certain bacterial species in tomatoes. While probiotics contribute to host well-being, pathogens actively cause harm and illness.
A mule is sterile primarily due to the incompatibility of chromosomes inherited from its two different parent species: a horse and a donkey. Horses have 64 chromosomes (32 pairs), while donkeys have 62 chromosomes (31 pairs). When a male horse (stallion) mates with a female donkey (jenny), their offspring, the mule, inherits 32 chromosomes from the horse and 31 chromosomes from the donkey, resulting in a total of 63 chromosomes. This odd number of chromosomes creates a significant problem during meiosis, the process of cell division that produces gametes (sperm and eggs). During meiosis, homologous chromosomes must pair up precisely. With 63 chromosomes, the mule has an uneven number, making proper pairing impossible. Consequently, viable gametes cannot be formed, rendering the mule unable to reproduce and thus sterile.
Charles Darwin played a monumental role in shaping the modern understanding of species through his theory of evolution by natural selection, detailed in his seminal work, "On the Origin of Species." Prior to Darwin, the prevailing view was that species were immutable and specially created. Darwin challenged this concept, proposing that species are not fixed entities but rather evolve over vast periods from common ancestors through a process where individuals with advantageous traits are more likely to survive and reproduce. This natural selection leads to gradual changes and the diversification of life, explaining the evolutionary connections between different species and how new species arise from existing ones through adaptation to their environments.
- For the construction of houses, dams, and factories forests are destroyed. The area surface of forests is also getting reduced.
- As the bull elephant is hunted for their tusks the cow elephant during breeding season enters in to the dwelling area of people.
The recent molecular taxonomical tools can be used to identify and classify the organism. The following molecular techniques and approaches are used in molecular tools.
* DNA barcoding – Short genetic marker in an organism’s DNA to identify whether it belongs to a particular species.
* DNA hybridization – Measures the degree of genetic similarity between pools of DNA sequences.
* DNA fingerprinting – to identify an individual from a sample of DNA by looking at unique patterns in their DNA.
* Restriction Fragment Length Polymorphism (RFLP) Analysis- the difference in homologous DNA sequences can be detected by the presence of fragments of different lengths after digestion of DNA samples.
* Polymerase chain reaction (PCR) sequencing- to amplify a specific gene or portion of a gene.
Aristotle (384 to 322 BC) was the first to classify all animals in his Historia Animalium in Latin. He classified the living organisms into plants and animals. Animals were classified as walking (terrestrial), flying (birds), and swimming (aquatic) based on their locomotion.
He classified the animals with red blood cells as Enaima and those without red blood cells as Anaima. Though his method of classification had limitations, his contribution to biology was remarkable. Theophrastus did his research on the classification of plants. He was known as the Father of Botany.
Part II
11th Bio Zoology Guide The Living World Additional Important Questions and Answers
- (a) class
- (b) order
- (c) species
- (d) genus
(c) species
c. Swimmers & aquatic
d. All the above.
- (a) not related to evolution
- (b) specific class of evolution
- (c) specific unit of evolution
- (d) fertile specific unit in the evolutionary history of a race
(d) fertile specific unit in the evolutionary history of a race
a. John Ray
- (a) species
- (b) genus
- (c) order
- (d) taxon
(d) taxon
a. Carolous Linnaeus
- (a) Huxley
- (b) Odom
- (c) Elton
- (d) Linnaeus
(c) Elton
c. l6s rRNA
- (a) inter breeding
- (b) variations
- (c) differential reproduction
- (d) none of the above
(b) variations
D. Theophrastus – Introduces Taxonomy
A-IV, B-I, C-II, D-III. When a male horse mates with a female donkey, the offspring is a hinny (A-IV). When a male donkey mates with a female horse, the offspring is a mule (B-I). When a male lion mates with a female tiger, the offspring is a liger (C-II). When a male tiger mates with a female lion, the offspring is a tigon (D-III). These are all interspecific hybrids that result from crosses between different species within the genus Panthera or between horses and donkeys, demonstrating reproductive isolation between species.
- (a) class
- (b) species
- (c) phylum
- (d) genus
(d) genus
d. Domestic crow – Salcopopsindica
a. 1 -d,2-c,3-b,4-a
- (a) order
- (b) family
- (c) genus
- (d) phylum
(d) phylum
- (a) Sporozoa
- (b) Mastigophora
- (c) Ciliate
- (d) Sarcodina
(a) Sporozoa
- (a) flagella
- (b) cell wall
- (c) micronucleus
- (d) macronucleus
(c) micronucleus
- (a) sporozoites
- (b) microgametes
- (c) macrogametes
- (d) signet ring
(b) microgametes
- (a) lobopodia
- (b) plasma membrane
- (c) uroid portion
- (d) contractile vacuole
(d) contractile vacuole
- (a) locomotion
- (b) encystment
- (c) sporulation
- (d) binary fission
(b) encystment
(2 marks)
II. Very Short Questions
- Aristotle’s classification system had limitations and many organisms were not fitting into his classification.
- The tadpoles of frogs are born in water and have gills but when they metamorphosed into adult frogs they have lungs and can live both in water and on land. There is no answer to this question.
- Based on locomotion birds bats and flying insects were grouped either just by observing one single characteristic feature the flying ability.
- On the contrary to the above-said example, the ostrich emu and penguin are all birds but cannot fly. He did not classify them as birds.
- This domain includes single-celled organisms the prokaryotes.
- They have the ability to grow in extreme conditions like volcano vents hot springs and polar ice caps hence are called extremophiles.
- They are capable of synthesizing their food without sunlight and oxygen by utilizing hydrogen sulphide and other chemicals from the volcanic vents.
- Some of them produced methane.
- Few live in salty environments and called Halophiles.
- Some thrive in acidic environments and are called thormoacidophiles.
- Bacterias are prokaryotic.
- They do not have a definite nucleus and do not have histones.
- They have circular DNA.
- They do not possess membrane-bound organelles except for 70s ribosomes.
- Their cell wall contains peptidoglycans.
- Many are decomposers. Some are photo-synthesizers and few cause diseases.
- There are beneficial probiotic bacteria. (Eg.) Cyanobacteria produce oxygen.
Cladistic classification, also known as phylogenetic systematics, is a method of classifying organisms based on their evolutionary relationships, specifically by grouping them into clades. A clade is a group that includes a common ancestor and all of its descendants. This system rigorously distinguishes between ancestral characters (plesiomorphies), which are traits common to a broader group and its ancestors, and derived characters (apomorphies), which are evolutionary novelties unique to a particular lineage and its descendants. The significance of cladistics lies in its ability to construct cladograms, which are branching diagrams that visually represent the hypothetical evolutionary history or phylogeny of a group of organisms. By focusing on shared derived characters (synapomorphies), cladistics ensures that classification reflects true evolutionary relationships, creating monophyletic groups. This approach provides a more natural and objective system of classification compared to traditional methods, as it directly reflects the process of evolution and the accumulation of derived characters leading to the formation of new species, rather than just new subspecies.
- The scientific name should be italicized in printed form and if handwritten it should be underlined separately.
- The generic name’s first alphabet should be in uppercase.
- The specific name should be in lower case.
- The scientific names of any two organisms are not similar.
- The name of the scientist who first publishes the scientific name may be written after the species name along with the year of publication.
- (Eg.) Lion – Felis Leo Linn. 1758 (or) Felis Leo L. 1758