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What is Animalia? Class 9 Science Diversity in Living Organisms

Animalia Class 9 Science Diversity in Living Organisms

 Animalia Class 9 Science Diversity in Living Organisms

What do you mean by Animalia?

Animalia is a group of living organisms like multicellular eukaryotes. They do not have cell walls. The organisms belonging to this group are heterotrophs (Consume the food from the environment). They exhibit a high level of tissue differentiation, have well developed nervous system and specialized body organs. Most animals of this group are movable.

The animal kingdom is classified into different subphylum’s as follows:

Animalia Class 9 Science Diversity in Living Organisms

Phylum 1- Porifera

The organisms belonging to this group have holes.

The animals of this group are non- motile and are attached to some rigid support.

The organisms belonging to this group have pores throughout their body.

They have a canal system circulates the water throughout the body of these organisms to transport the food and oxygen.

These organisms are covered with a hard external layer or skeleton.

Examples of animals belonging to this group are Euplectella, Sycon, Spongilla.

Animalia Class 9 Science Diversity in Living Organisms

Phylum 2 – Coelenterata (cnidaria)

The animals living in water belong to this group.

The organisms belonging to this group possesses more body design differentiation.

They also have a cavity in their body.

The body of these organisms has 2 layers of cells.

  • One type of layer makes up cells on the outside of the body.
  • The second type of layer composes the inner lining of the body.

The organisms of this group live either in colonies (corals) or have a solitary like–span (Hydra).

Examples of animals belonging to this group are Jellyfish and sea anemones

Animalia Class 9 Science Diversity in Living Organisms

Phylum 3 – Platyhelminthes

The organisms belonging to this group are complexly designed.

The body of these organisms has bilaterally symmetrical shape. This means that the design of the left and the right halves of the body are alike.

These organisms have three layers of cells that make up differentiated tissues due to which such animals are called triploblastic.

These organisms have no true internal body cavity or coelom.

Animalia Class 9 Science Diversity in Living Organisms

The body of these organisms is flattened dorsoventrally which means from top to bottom due to which these animals are also called flatworms.

These organisms are either freely existing or parasitic.

Examples of animals belonging to this group are planarians or parasitic animals like liver flukes.

Fig. Planaria (left) and Liver flukes (right)

Phylum 4 – Nematoda

The bodies of the organisms belonging to this group are bilaterally symmetrical and triploblastic.

The body of these organisms is cylindrical.

These organisms have tissues but no real organs.

They have body cavity or a pseudocoelom in their body.

Examples of animals belonging to this group are Ascaris, Wuchereria.

Animalia Class 9 Science Diversity in Living Organisms

Phylum 5 – Annelida

The organisms belonging to this group are bilaterally symmetrical and triploblastic.

These organisms have a true body cavity so that the true organs are enveloped within the body structure.

The differentiation occurs in a segmental fashion, with the segments lined up one after
the other from head to tail.

An organism of this group lives in a variety of habitats like fresh water, marine water, and land.

Examples of organisms belonging to this group are Earthworms and leeches are familiar examples

Animalia Class 9 Science-Diversity in Living Organisms

Phylum 6 – Arthropoda

This is the largest group of animals

The bodies of the organisms belonging to this group are bilaterally symmetrical and segmented.

These organisms have an open circulatory system. Therefore the blood does not flow in a well-defined blood vessel.

The coelomic cavity of these organisms is blood-filled.

These organisms have jointed legs.

Examples of organisms belonging to this group are prawns, butterflies,
houseflies, spiders, scorpions, and crabs.

Animalia Class 9 Science Diversity in Living Organisms

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Phylum 7 – Mollusca

The organisms belonging to this group are bilaterally symmetrical.

The coelomic cavity is reduced in these organisms.

There is little segmentation.

They have an open circulatory system.

They have kidney-like organs for excretion.

There is a foot that helps for movement.

Examples of animals belonging to this group are snails and mussels, pila, unio.

Animalia Class 9 Science Diversity in Living Organisms

Phylum 8 – Echinodermata

The organism that belongs to this group is spiny skinned organisms.

They are free-existing marine animals.

They are triploblastic.

They have a coelomic cavity.

These organisms use an irregular water-driven cylindrical system for movement.

They have hard calcium carbonate structures which are their skeleton.

Examples of organisms belonging to this group are starfish and sea urchins.

Animalia Class 9 Science Diversity in Living Organisms

Phylum 9 – Protochordata

Protochordates are generally marine animals.

The organisms belonging to this group are bilaterally symmetrical.

They are triploblastic and have a coelom.

They have a long rod-like support structure called notochord at certain stages of their lives. The notochord is a runs along the back of the animal and separates the nervous tissue from the gut that gives a place for the muscles to attach for an easy and comfortable movement.

Examples of organisms belonging to this group are BalanoglossusHerdmania, and Amphioxus

Animalia Class 9 Science Diversity in Living Organisms

Phylum 10 –Vertebrata

The animals belonging to this group possesses a true vertebral column.

These organisms have an internal skeleton which allows a completely different distribution of muscle attachment points required for movement.

Animals belonging to this group are bilaterally symmetrical.

They are triploblastic, coelomic and segmented.

They have a notochord, dorsal nerve cord and paired gill pouches.

They also have a complex differentiation of body tissues and organs.

This group of animals can be further divided into the following categories:

Animalia Class 9 Science Diversity in Living Organisms

Pisces

Pisces group contains the aquatic animals like fishes. Animals of this group have skin covered with scales. They breathe through gills. They are cold-blooded and have the two-chambered heart. They lay eggs to give birth to their young ones.

Some aquatic species have skeletons made entirely of cartilage. For example, sharks.

Whereas some species have a skeleton made of both bone and cartilage. For example, fishes like Rohu or tuna.

Animalia Class 9 Science Diversity in Living Organisms

Amphibia

The animals belonging to this group do not have scales.

They have a three-chambered heart.

These organisms respire either through their gills or lungs.

They lay eggs to give birth to their young ones.

These animals are found both in water and on land.

Examples of animals belonging to this group are Frogs, toads, and salamanders

Animalia Class 9 Science Diversity in Living Organisms

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Reptilia

These animals belonging to this group are cold-blooded.

These animals have scales in their body.

They breathe through their lungs.

Most of the animals of this group have a three-chambered heart but crocodiles have a four-chambered heart.

They lay eggs with tough coverings to give birth to their young ones.

They do not need to lay their eggs in water, unlike amphibians.

Examples of animals belonging to this group are Snakes, turtles, lizards, and crocodiles.

Animalia Class 9 Science Diversity in Living Organisms

Aves

The animals belonging to this group are warm-blooded.

They have a four-chambered heart.

They breathe through lungs.

They lay eggs to give birth to their young ones.

These animals have an outside layer of feathers.

They also characterized by two forelimbs, toothless beaked jaws, and are adapted to fly.

Birds belong to this group.

Animalia Class 9 Science Diversity in Living Organisms

Mammalia

The animals belonging to this group are warm-blooded.

They have a four-chambered heart.

They are characterized by a mammary gland that produces milk to nourish their young, hairy skin, sweat and oil glands.

All the animals and human beings giving birth to their young ones are called mammals.

Animalia Class 9 Science Diversity in Living Organisms

Watch videos and learn the Animalia Kingdom and four other kingdoms, click Class 9 Science for details.

Tag: Animalia, Porifera, Coelenterata, Platyhelminthes, Nematoda, Annelida, Arthropoda, Mollusca, Echinodermata, Protochordata, Vertebrata, Pisces, Amphibia, Reptilia, Aves, Mammalia,

Check other topics of Class 9 Science Diversity in Living Organisms click below

What is Plantae?

Explain Classification System

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