Topics
Heredity and Evolution
- Heredity
- Protein Synthesis
- Transcription, Translation and Translocation
- Protein synthesis - Transcription
- Protein synthesis – Translation
- Evolution
- Theories of Origin of Life
- Evolution and Classiffication
- Evidences for Biological Evolution
- Darwin’s Theory of Natural Selection
- Lamarck’s Theory of Evolution
- Speciation
- Origin and Evolution of Man
Life Processes in Living Organisms Part -1
- Living Organisms and Life Processes
- Living Organism and Energy Production
- Formation of ATP
- Energy Production in Living Organism
- Cell Division: an Essential Life Process
- Mitosis and Its Phases
- Phases of Mitosis: Karyokinesis (Division of Nucleus)
- Phases of Mitosis: Cytokinesis (Division of Cytoplasm)
- Significance of Mitosis
- Meiosis as a Reduction Division
- Stages of Meiosis: Meiosis I
- Stages of Meiosis: Meiosis II
- Significance of Meiosis
- Differences Between Mitosis and Meiosis
Life Processes in Living Organisms Part - 2
- Introduction to Life Processes in Living Organisms
- Asexual Reproduction in Animal
- Fission
- Fragmentation
- Regeneration
- Budding
- Sporulation (Sporogenesis)
- Asexual Reproduction in Plant
- Budding
- Vegetative Reproduction
- Reproduction in Plant
- Sexual Reproduction in Flowering Plants
- Sexual Reproduction in Animals
- Human Reproductive System
- The Male Reproductive System
- The Female Reproductive System
- Gametogenesis
- Fertilization in Human
- Embryonic Development in Human
- Implantation in Human
- Pregnancy in Humans
- Placenta (Growth) in Human
- Parturition (Birth) in Human
- Menstrual Cycle (Ovarian Cycle)
- Reproduction and Modern Technology
- Reproductive Health
Environmental Management
Towards Green Energy
Animal Classification
- Biological Classification
- Classification
- Taxonomic Hierarchy of Living Organisms: Unit of Classification
- New Criteria for Basis of Classification
- History of Animal Classification
- Traditional Method of Animal Classification
- Five Kingdom Classification
- Phylum: Porifera
- Phylum: Cnidaria/Coelenterata
- Phylum: Platyhelminthes
- Phylum: Aschelminthes
- Phylum: Annelida
- Phylum: Arthropoda
- Phylum: Mollusca
- Phylum: Echinodermata
- Phylum: Hemichordata
- Phylum: Chordata
- Chordata: Vertebrata
Introduction to Microbiology
Cell Biology and Biotechnology
Social Health
Disaster Management
Life's Internal Secrets
The Regulators of Life
The Life Cycle
Mapping Our Genes
Striving for Better Environment 2
Understanding Metals and Non-Metals
Amazing World of Carbon Compounds
- The Covalent Bond
- Saturated and Unsaturated Carbon Compounds
- Chains, Branches and Rings of Carbon Compound
- Homologous Series of Carbon Compound
- Nomenclature of Organic Compounds (IUPAC)
- Chemical Properties of Carbon Compound
- Chemical Properties of Carbon Compound
- Chemical Properties of Carbon Compound
- Ethanol
- Ethanoic Acid
- Soap
description
- Taxonomic Hierarchy of Living Organisms
- Species
- Genus
- Family
- Order
- Class
- Phylum
- Kingdom
notes
[ICSE 9]
Taxonomic Categories
GENUS: Similar species constitute the next higher category called genus (plural: genera). Let us take an example. We have crows around our homes. The hill crow (also called the jungle crow) is different from the crow found on the plains (the house crow) in many features-size, colour, beak, etc. The hill crow and the house crow are two different species. They cannot interbreed; yet they are crows, easily made out from other birds. These two kinds of crows belong to the same genus Corvus.
FAMILY: A group of genera with certain common characteristics form a family. Take an example. Lion (Panthera leo) and tiger (Panthera tigris) are different species but they belong to the same genus. This genus (Panthera) and another genus (Pelis) which includes the domestic cat, also share some common characteristics. Therefore, there is the larger cat-family (Felidae) which includes the genus of lion and tiger, and the genus of the domestic cat.
ORDER: A group of related families makes an order. For example, the cat family Felidae (lions, tigers, and cats) and the dog family Canidae (dogs, foxes, jackals, etc.) possess some common features and so they make an order. In the example cited here the order is "Carnivora':
CLASS: Related orders make a class. For example, the orders of different animals like those of dogs, cats, bats, whales, monkeys, and even humans, etc., have some common features such as hairy skin and milk-glands. The particular class of the animals mentioned here is "Mammalia''.
PHYLUM: A phylum is the largest division in the classification of plants and animals. Related classes constitute a phylum. For example, the classes of different animals like mammals, birds, reptiles, frogs, fishes, etc., together constitute the phylum Chordata which has a notochord or a backbone.
KINGDOM: The kingdom is the largest division of living beings.
notes
[CBSE 11]
Taxonomic Categories
Species:
Taxonomic studies consider a group of individual organisms with fundamental similarities as a species. One should be able to distinguish one species from the other closely related species based on the distinct morphological differences. Let us consider Mangifera indica, Solanum tuberosum (potato) and Panthera leo (lion). All the three names, indica, tuberosum and leo, represent the specific epithets, while the first words Mangifera, Solanum and Panthera are genera and represents another higher level of taxon or category. Each genus may have one or more than one specific epithets representing different organisms, but having morphological similarities. For example, Panthera has another specific epithet called tigris and Solanum includes species like nigrum and melongena. Human beings belong to the species sapiens which is grouped in the genus Homo. The scientific name thus, for human being, is written as Homo sapiens.
Genus:
Genus comprises a group of related species which has more characters
in common in comparison to species of other genera. We can say that
genera are aggregates of closely related species. For example, potato and
brinjal are two different species but both belong to the genus Solanum.
Lion (Panthera leo), leopard (P. pardus), and tiger (P. Tigris) with several
common features are all species of the genus Panthera. This genus differs
from another genus Felis which includes cats.
Family
The next category, Family, has a group of related genera with still less number of similarities as compared to genus and species. Families are characterised on the basis of both vegetative and reproductive features of plant species. Among plants for example, three different genera Solanum, Petunia and Datura are placed in the family Solanaceae. Among animals for example, genus Panthera, comprising lion, tiger, leopard is put along with genus, Felis (cats) in the family Felidae. Similarly, if you observe the features of a cat and a dog, you will find some similarities and some differences as well. They are separated into two different families – Felidae
and Canidae, respectively. The next category, Family, has a group of related genera with still less number of similarities as compared to genus and species. Families are characterised on the basis of both vegetative and reproductive features of plant species. Among plants for example, three different genera Solanum, Petunia and Datura are placed in the family Solanaceae. Among animals
for example, genus Panthera, comprising lion, tiger, leopard is put along with genus, Felis (cats) in the family Felidae. Similarly, if you observe the features of a cat and a dog, you will find some similarities and some differences as well. They are separated into two different families – Felidae and Canidae, respectively.
Order:
You have seen earlier that categories like species, genus, and families are based on a number of similar characters. Generally, order and other higher taxonomic categories are identified based on the aggregates of characters. Order being a higher category, is the assemblage of families which exhibit a few similar characters. The similar characters are less in number as compared to different genera included in a family. Plant families like Convolvulaceae, Solanaceae are included in the order Polymoniales mainly based on the floral characters. The animal order, Carnivora, includes families like Felidae and Canidae.