The Living World: Class 11 Biology NCERT Chapter 1

Key Features of NCERT Material for Class 11 Biology Chapter 1 – The Living World

In chapter 1 of Biology NCERT textbook: The Living World, we will learn about the material that manages the living scene class 11 notes. In the next chapter: Biological Classification, you will know how biological classification is done to put the immense number of animals and plants into categories that can be easily named and recalled without ambiguity.

The living scene comprises of an extraordinary degree of decent variety among living creatures. The early man absolutely knew the contrast between non-living issues and living creatures. Instances of lifeless or non-living issue can be ocean, wind, or fire. Early man used to adore a portion of the lifeless issue. Moreover, living life forms including people is something that came very late in mankind’s history. Moreover, early society got little advancement in science because of the human-centric perspective on science. Later on, there was a definition of a precise depiction of living things. Generally important, this offered to ascend to complete frameworks of terminology, characterization, and recognizable proof. 

In the living scene, the disclosure of a large number of plants and creatures has occurred. Nonetheless, there are as yet countless plants and creatures that are yet to be found. Moreover, one can see the striking contrasts between living beings regarding shading, size, physiology, and natural surroundings. To contemplate the decent variety of living beings, researchers have thought of specific guidelines for terminology, distinguishing proof, and grouping of life forms. Generally essential, ordered examinations managing plants and creature species are significant in horticulture, industry, and ranger service. Along these lines, the living scene class 11 notes will assist you with learning this.

Quick revision notes

The Living World: Identification

Life is a remarkable, complex association of particles that communicates through substance responses which lead to development, advancement, responsiveness, transformation, and multiplication. 

The items showing development, improvement, proliferation, breath, responsiveness, and different qualities of life are assigned as living creatures.

Unique features of a living organism:

Development Living life forms develop in mass and number. A multicellular organism expands its mass by cell division. In plants development constant all through life in their meristematic region however, in creatures, development happens to a particular age. Unicellular life forms likewise develop by cell division. Living beings show inward development because of the expansion of materials and the arrangement of cells inside the body. Non-living life form like mountains, stones, precious stones likewise become however because of the expansion of comparable materials to their external surface. 

Multiplication It is the arrangement of new people of the comparable kind. Propagation isn’t basic for the endurance of the people. It is required for the propagation of the populace. In sexual propagation, two guardians are included to deliver pretty much comparative sorts of people. In abiogenetic proliferation single parent is included and an individual is duplicate of the parent. Abiogenetic proliferation may happen by splitting, aging, recovery, vegetative spread, and so forth. In unicellular creature, development and propagation are equivalent words. Numerous creatures like donkeys, sterile working drones, barren human couples don’t repeat. Along these lines, proliferation isn’t a comprehensive quality of living being. Nonetheless, no nonliving article has the ability to repeat or duplicate. 

1. Digestion:

The whole of a wide range of synthetic responses happening in a person because of explicit collaborations among various sorts of atoms in the inside of cells is called digestion. All exercises of a living being including development, developments, advancement, proliferation, and so forth are because of digestion. There are two sorts of digestion Catabolism and Anabolism. Anabolism incorporates all the structure up responses to expand the mass of the living resembling photosynthesis. In catabolism breakdown responses are included, for example, breath, processing, and so forth no nonliving article show digestion. 

2. Cognizance:

It is the familiarity with the environmental factors and reacting to outer boosts. Outside boosts might be physical, concoction or natural. Plants likewise react to boosts like light, water, attractive energy, contamination, and so forth. Every living life form prokaryotic to eukaryotic reacts to various types of upgrades. A person is just a creature who knows about himself. Awareness accordingly, turns into the characterizing property of living life forms. 

  1. Life expectancy each living life form has a clear life expectancy of birth, development, development, senescence and demise. 
  2. Living creatures are in this way, self-imitating, developing and self-administrative intelligent frameworks fit for reacting to outer boosts.

Assorted variety in the living scene or biodiversity is the event of assortment of living things varying in morphology, size, shading, life systems, environments and propensities. Each unique sort of plant, creature or microorganisms speaks to animal categories. 

Right now there are some 1.7 – 1.8 million living life forms known to science. Out of which 1.25 are creatures and about 0.5 millions are plants.

  • Distinguishing proof 
  • Terminology 
  • Arrangement 
  • Systematics is part of science that manages indexing plants, creatures and other life form into classifications that can be named, analyzed and contemplated. 
  • Distinguishing proof is the finding of right name and spot and spot of a life form in an arrangement of characterization. It is finished with the assistance of keys. This is completed by deciding likeness with definitely known living beings. 
  • Terminology is the procedure of normalize naming of living life form with the end goal that a specific life form is known by a similar name everywhere throughout the world. For plants logical names depend on universal code of plant classification (ICBN) and creatures names on worldwide code of zoological terminology (ICZN). Logical name guarantees that every life form has just one name.

Natural classification It is the generally acknowledged standards to give logical name to known living beings. Each name has two parts nonexclusive name (family) and explicit designation (species). This arrangement of classification was given via Carolus Linnaeus.

  • Mango-Mangifera indica.

  • Individuals Home erudition. 

Widespread guidelines of terminology:-

  • Natural names are for the most part in Latina and written in italics. 
  • The principal word in a natural name speaks to the family while the subsequent segment indicates the particular appellation. 
  • Both the words in natural name, when written by hand, are independently underlined, or imprinted in italics. 
  • The primary word meaning the family begins with a capital letter while the particular designation begins with little letter. 
  • Arrangement It is the procedure by which anything is gathered into advantageous classifications dependent on some effectively detectable attributes. Grouping makes the investigation of living beings helpful. 
  • Scientific categorization The procedure of arrangement based on outside and inside structure alongside inward structure of cell, advancement process and natural data is known as scientific categorization.

Taxonomic categories

The Living World: Taxonomical

An ordered class is a position or level in the progressive grouping of life form. There are seven commit classifications and some middle of the road classifications. Since the classification is a piece of by and large ordered course of action, it is assembled ordered class and all classes comprise the ordered chain of command

Taxonomic hierarchy is shown below:-

Taxonomic hierarchy








  • Species-Species are the regular populace of people or a gathering of populace which look like each other in all fundamental morphological and regenerative characters with the goal that they can interbreed unreservedly and produce rich posterity. For Mango tree indica is types of class Mangifera(Mangifera indica). 
  • Class it is a gathering of related animal groups which look like each other in certain connected characters. All types of sort attempted to have advanced from a typical progenitor. Lion, Tiger, Leopard are firmly related species and put in same family Panther. 
  • Family-It is an ordered class which contains at least one related genera. All genera of a family have some basic highlights or related characters. Family Solanacaeae contains various genera like Solanum, Withania, Datura and so on. 
  • Request This class incorporates at least one related families. Families felidae and canidae are remembered for same request meat eater. 
  • Class-A class is made of at least one related requests. The class dicotyledoneae of blooming plants contains all dicots which are gathered into a few requests like roales, polemoniales, renales and so on. 
  • Division/Phylum-The term phylum is utilized for creatures while division is utilized for plants. They are shaped of at least one class. The phylum chordate of creatures contains the warm blooded creatures as well as aves, reptiles, creatures of land and water, and so forth. 
  • Realm It is the most noteworthy ordered class. All plants are remembered for the realm Plantae while all creatures have a place with realm Animalia. 
  • Ordered Aids:- Techniques, methodology and put away data that are helpful in distinguishing proof and characterization of living beings are called ordered guides. 
  • Herbarium-Herbarium is where dried and squeezed plants examples, mounted on sheets are kept efficiently as indicated by a generally acknowledged arrangement of characterization. The herbarium sheets additionally convey a mark giving data about date and spot of assortment, English, nearby and plant names, family, authority’s name and so on. 
  • Professional flowerbed They are specific nurseries having assortment of living plants for reference. Plants in these nurseries are developed for recognizable proof reason and each plant is marked demonstrating its logical name and family. The well known greenhouse incorporates Royal professional flowerbed, Kew (London), Indian greenhouse, Kolkata and National greenhouse, Lucknow. 
  • Historical centers Biological gallery is set up in instructive establishments like universities and school for reference purposes. Examples are protected in the holders or containers in additive arrangements or as dry examples. Creepy crawlies are protected in bug boxes in the wake of gathering, murdering and sticking. 
  • Zoological parks-These are where wild creatures are kept in ensured situations under human consideration and which empower us to find out about their food propensities and conduct. Normal living spaces are given beyond what many would consider possible.


Ordered key is a fake investigative gadget having a rundown of explanations with dichotomic table of substitute attributes which is utilized for distinguishing life forms. Normally two differentiating characters are utilized. The one present in the living being is picked while other is dismissed. Every announcement of a key is called lead. Separate ordered keys are utilized for each ordered class like species, variety, family, and so forth. Keys are commonly investigative in nature. 

Vegetation, manuals, monographs and indexes are some different methods for recording depictions. 


Q.A researcher has run over a plant which he feels is another species. In what capacity will he approach its recognizable proof, arrangement, and classification? 

Answer: The researcher should take a gander at different morphological highlights of the plant. He should start with wide highlights, for example, the sort of roots and venation. In the event that sinewy roots are available, at that point the plant may have a place with monocotyledonous. If there should be an occurrence of the taproot, the plant may have a place with dicotyledonous. 

This can be additionally affirmed by the nearness of equal or reticulate venation and number of cotyledons in the seeds. From that point forward, the researcher should take a gander at the kind of phyllotaxy, inflorescence, and so forth which will help in characterizing the plant all together and family. 

On the off chance that it is a blossoming plant, at that point a definite investigation of different botanical parts can give different hints about a specific family or request. Kind of placentation can be concentrated by taking a gander at the course of action of seeds inside the natural products. At long last, the game plan of antheridium and gynoecium can assist the researcher with confirming a specific family for the new species. 

The exploration work of researchers based on these highlights ought to be checked to finish up it as another species found. The researcher likewise needs to preclude the specific likeness with some other existing species before showing up at an exceptional name for the new species found.

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