Important Notes - The Living World for NEET Biology

The Living World: Important Notes for NEET Biology

The living world is an important chapter in the scope of NEET syllabus. Since the chapter introduces you to the fundamental concepts of the world of the living organisms, it is essential to be familiar with it right from the beginning.

Furthermore, having a fair idea of the concepts covered in the said chapter enables one to progress on to much broader concepts with ease. Also, the fact that this chapter is quite large increases the chance of missing out on relevant topics. 

Nonetheless, one can quickly eliminate the said risk by referring to important notes of biology for NEET living world. 


What is the Living World?

It comprises diverse organisms which can be found in almost all kinds of habitat including – mountains, forests, oceans, deserts, freshwater bodies, etc. Each living organism tends to share features like growth, maintenance of homeostasis, reproduction, use of energy, adaption, etc.  

These features help to distinguish between different species and also come in handy in establishing a link between organisms with a common genetic component.


Features of Living World

  • Growth: The increase in cells’ number and mass through cell division.  

  • Tactile sense: It is the ability to sense the environment.

  • Metabolism: A series of biochemical reactions occurring in the body to form and change chemical composition.

  • Reproduction: The process of producing offspring and continuing the progeny.

  • Cellular Organisation: The very defining characteristics of all living organisms.

  • Consciousness:  The sense of being aware of one’s surroundings, actions and intentions. 

Notably, protoplasm also tends to show all of these characteristics. As a result, it is called the physical basis of life.  

Learn about each of these features in detail by referring to the latest living world notes which are available online. The notes will help you understand the key points quite effectively. 


Biodiversity 

Diversity in the living world or biodiversity can be described as the total number of living organisms which are found on this earth. Such entities are classified with the help of specific terms like –

  1. Nomenclature

  2. Classification

  3. Taxonomy

  4. Systematics


Nomenclature

It is a process wherein scientific names are rendered to organisms for identification. There are 3 types of nomenclature –

  1. Binomial nomenclature

  2. Polynomial nomenclature

  3. Trinomial nomenclature


The International Code of Botanical Nomenclature’s Rules For Nomenclature Are –

  • The name of a specific will consists of two words – the first will be the genus, and the last will be the specific epithet.

  • In case of plants, generic and specific names cannot be the same, but for animals, it will be deemed valid.

  • The first letter of the genus will be in a capital letter while the specific term will be in small letters. For instance - Azadirachta indica.

  • Names should be in Latin or Latinised.

  • When recorded manually, the names should be underlined independently. In case of print, it must be registered in italics.


Taxonomic Category

It is a process which is responsible for identification, name-giving and categorisation of organisms as per their cell structure, advancement process and other biological data.

Notably, these categories depict rank in a hierarchical arrangement in ascending order, and there are 7 of such mandatory categories –

Category

Description

Kingdom

Comprises different species of fauna and division of fauna.

Phylum 

Comprises a collection of similar classes.

Class

A subdivision within phylum and may comprise more than one order.

Order

Assembles one or more similar families.

Family

A grouping of similar genera which are characterised based on their vegetative and reproductive features.

Genus

Assembles similar species originating from a common ancestor with correlated characters.

Species

A unit of classification of a group which is similar in shape and reproductive features.


In short, the order is as follows: Kingdom > Division > Class > Order > Family > Genus > Species.

An example of the taxonomic description of man – 

Animalia Chordata Mammalia Primata Hominidae Homo Sapiens 


Taxonomy Aids

These are simply the techniques, information and process which prove effective while identifying or classifying living organisms. Here are some prominent taxonomic aids –

  • Herbarium

  • Keys

  • Museums

  • Zoological park

  • Botanical garden

Do not forget to learn about these in details while revising NEET UG biology diversity in living world. 


Facts Related to Taxonomy

Some of the common facts about the taxonomy of the living world are –

  1. Did you know the term ‘Taxonomy’ was first coined by A.P. Candolle? 

  2. Taxonomic categories are also known as the Linnaean hierarchy.

  3. Carolus Linnaeus is known as the father of taxonomy.

  4. H. Santapau is regarded as the father of Indian taxonomy

  5. The concepts of biological species were put forward by Dobzhansky and Mayr.

  6. William Roxburgh is acknowledged as the father of Indian Botany and Indian Herbaria.


Boost Your Revision Plan for Effective Results!

Since the scope of NEET is vast, and skipping fundamental topics is not feasible, you need to be smart with your revision plan. 

As a means to revise vital topics quickly with significant impact, incorporate quality study solutions like the living world class 11 notes for NEET. It will help you to cover all the topics at a glance while also helping you to identify essential information.

Furthermore, pay attention to chapters like the living world, which introduces you to new concepts to have a clear understanding right from the beginning.

FAQ (Frequently Asked Questions)

1. Why Do We Classify Living Organisms?

A large number of organisms are found on this earth. Since studying all of them can be challenging, scientists decided to classify them into specific taxonomic categories. It helps identifying the connection between similar organisms and analyse the same with ease. 

2. What Are The Significant Features Of Living Organisms?

The significant features of organisms include growth, cell organisation, metabolism, reproduction, sense of surrounding, etc.  The similarities in these features link organisms to other entities with a common genetic component.

3. What Are The Taxonomic Categories? Provide An Example.

It is the sequence in living organisms are identified, named and organised based on their cell structure, growth and other vita biological data. The taxonomic category of a tiger is – Kingdom (Animalia), Phlym (Chordata), Class (Mammalia), Order (Carnivore), Family (Felidae), Genus (Panthera), Species (Tigris).