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Diversity in Living Organisms – Classification Overview | Class 9 Biology

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Our planet is gifted with various living life forms, which change in size, shape, environment, nourishment, generation, and much more. In light of their actual highlights and their environment, these creatures of Kingdom Animalia are arranged into various requests and classes. Diversity in living organic entities can be capable wherever on the planet. The warm and moist districts of the earth are profoundly different and are known as the locale of super biodiversity. 12 nations on the planet have the greater part of the biodiversity on the planet. India is one of them. Each individual has a novel DNA setup. We vary among people in the manner we look and changed credits adding to it, for example, our level, coloring, and so on. On the off chance that we contrast ourselves and alternate animal types like a pony or a fish, we would shift significantly in practically everything viewpoints except if a pony is contrasted with a zebra, we would have the option to just draw a couple of contrasts.

Classification and Evolution 

Characterization or classification of life forms is firmly connected with advancement. Development is the progressions that have been collected throughout the long term in the body plan of creatures for better endurance. In 1859, Charles Darwin first portrayed the possibility of development in his book 

The Origin Of Species

Recorded underneath are surmisings drawn when development is associated with order:

  • ‘Lower’ or ‘crude’ living beings are the organic entities having the old body type and appear to have not changed throughout the long term.
  • ‘Higher’ or ‘high level’ creatures are the people who are generally ongoing and have gained their specific body plans.


The term “evolution” describes the progressive development of sophisticated species throughout geological time from simple ancestral forms.

According to Darwin’s Theory, all species descended from a single progenitor.

Basis of Evolution

Evolution can be studied based on several criteria. Let’s discuss each one of them.

  • Based on Molecular structure- DNA is a specific feature that enables the study of the evolution of different species over time.
  • Based on Fossils- The remains of living organisms that are discovered after several millions of years are called fossils. Fossils play a key role in studying the evolution of species.

Evolution has paved the ground for categorization at a basic level. Even if evolution has occurred, certain species still have ancestor body designs when it comes to the classification of creatures. They didn’t entirely alter. While other organisms evolved new, more advanced body plans that were distinct from those of their ancestors. The former category is referred to as lower or more primitive organisms, whereas the latter is referred to as higher or more developed organisms. These concepts, however, do not explain the evolutionary disparities. Older species are what we refer to as primitive, and young organisms are what we refer to as sophisticated. While younger organisms have complicated body plans, older species have simpler body plans. As a result, evolution led from older, simpler species to more sophisticated young organisms.


The course of action of the life forms in bunches based on their likenesses and contrasts is known as classification.

Diversity in Living Organism


Method of Classification

Grouping or classification can be done given many factors, for example,

  • Method of creation of food
  • Presence of Nucleus
  • In creatures – an association of one’s body parts, improvement of the body, particular organs for various capabilities
  • Body plan – Single-celled or Multicellular creatures

Systems of Classification

There are two different systems of classification, namely

  • Two kingdom classification 
  • Five kingdom classification

Two Kingdom Classification

This framework was proposed via Carolus Linnaeus who grouped organic entities into two kinds plants and creatures.

Five Kingdom Classification

This realm was proposed by H.Whittaker who partitioned the organic entities into five unique classes, namely

  1. Animalia
  2. Plantae
  3. Fungi
  4. Protista
  5. Monera

Five kingdoms of classification are the most widely accepted classification of biodiversity. Before knowing about each of these classifications in deep let’s know about the hierarchy of classification.

Hierarchy of classification:

  • Kingdom
  • Phylum
  • Class
  • Order
  • Family
  • Genus
  • Species

Kingdom Monera

  • Kingdom Monera includes unicellular prokaryotes.
  • They come up short on evident Nucleus.
  • They might be heterotrophic or autotrophic.
  • They might contain a cell wall.
  • Examples: Escherichia coli, Clostridium tetani, Cyanobacteria.

Kingdom Protista

  • Kingdom Protista includes unicellular, eukaryotic living beings.
  • They have pseudopodia, cilia, and flagella for movement.
  •  They display an autotrophic or heterotrophic method of sustenance.

Examples: Paramecium aurelia, Euglena, Amoeba.

Kingdom Fungi

  • Kingdom Fungi are multicellular, eukaryotic creatures.
  • The cell wall is comprised of chitin.
  • They show a saprophytic method of nourishment.
  • They live in a harmonious relationship with blue-green growth which is also termed a symbiotic relationship

Examples: Molds, Mildews, Yeasts, Mushrooms.

Kingdom Plantae

  • Kingdom Plantae is multicellular, eukaryotic life forms.
  • The cell wall is comprised of cellulose.
  • They set up their food through photosynthesis.
  • Realm Plantae is sub-separated into Thallophyta, Bryophyta, Pteridophyta, Gymnosperms, and Angiosperms.

Examples: Chlamydomonas, Chlorella, Spirogyra, Zygnema.

Kingdom Animalia

  • Kingdom Animalia is a multicellular, eukaryotic life form without a cell wall.
  • The life forms in the realm of Animalia can be basic or complex.
  • They are heterotrophs.
  • They are hereditarily assorted.
  • They display an organ-framework level of association.

Examples: Panthera tigris, Sharks, Butterflies.

FAQs on Diversity in Living Organisms

Question 1: What are the characteristics of Kingdom Animalia?


Several notable characteristics of Kingdom Animalia are

  • Multicellular
  • Eukaryotic Cells
  • Heterotrophic

Question 2: Describe Porifera.


The phylum Porifera contains around 5,500 types of wipes, which are sessile amphibian creatures. Wipes need tissues, however, their cells are approximately coordinated into practical gatherings. Most wipes live in marine conditions, yet some live in freshwater natural surroundings. This antiquated phylum might have developed more than a long time back, spreading the word about wiping a portion of Earth’s most seasoned creature species.

Question 3: Write about Archaebacteria.


Archaebacteria are the absolute most antiquated microbes that were found in outrageous territories like underground aquifers, pungent regions, and damp regions. The design of the cell wall is not normal for different microscopic organisms that assist them with making due in outrageous circumstances. They utilize the autotrophic method of nourishment. Their nucleotide groupings of tRNA and rRNA are exceptional.

Question 4: Write about Protozoa.


Protozoans are unicellular life forms. All things considered, protozoans were classified as “creature” protists as they are heterotrophic and showed creature-like behaviors. There are additionally parasitic protozoans that live in the cells of bigger life forms. The greater part of the individuals doesn’t have a predefined shape. For example, a one-celled critter can change its shape endlessly yet a paramecium has a positive shoe-like shape. The most notable instances of protozoans are single adaptable cells, paramecium, and euglena. Dissimilar to different individuals from this gathering, the euglena is a free-living protozoan that has chlorophyll, which implies it can make its food.

Question 5: Write the characteristics of Fungi.


  • Growths are eukaryotic, non-vascular, non-motile, and heterotrophic life forms.
  • They might be unicellular or filamentous.
  • They duplicate through spores.
  • Growths display the peculiarity of rotation of age.
  • Growths need chlorophyll and consequently can’t perform photosynthesis.
  • Growths store their food as starch.
  • Biosynthesis of chitin happens in growths.
  • The cores of the growths are tiny.

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Last Updated : 03 Nov, 2022
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