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✨Explain in how many groups Kingdom Animalia is divided ?

#Explain any 5 out of them

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Answer 1

The Animal KingdomApproximately two million different species of animals have been identified on Planet Earth and ten thousand more species of animals are discovered every year. They have been classified into nine major phyla—eight phyla being invertebrates (animals without a backbone). The one phylum of vertebrates (animals with a backbone) is further classified into five different classes—mammals, birds, fish, reptiles and amphibiansKingdom Animalia is the largest of the five existing kingdoms on Planet Earth. The scientific classification system is divided into seven major groups, (1) kingdom, (2) phylum or division, (3) class, (4) order, (5) family, (6) genus, and (7) species. The kingdom is the largest group and a species is the smallest. In the Animal Kingdom, the term phylum is used, and it is the second largest group.

Answer 2

hi your ans is
Classification of Animal Kingdom – Porifera, Coelenterata, Platyhelminthes, Aschelminthes, Annelida, Arthropoda, Mollusca, Echinodermata, Chordata.]

In detail
*Porifera are multicellular organisms exhibiting minimal level of tissue organization. They lack nervous system. Porifera get their name from two words, “pori,” meaning “holes,” and “fera,” meaning “bearing”. Porifera includes Sycon, Spongilla and Euplectella. e.g. Sponges. *Coelenterates are radially symmetrical organisms which live in marine habitat except for hydra. Some are solitude and some are colonial. Coelenterates get their name from two Greek words - “koilos,” meaning “hollow,” and “enteron,” meaning “intestine”.e.g. Corals, Hydra. *Platyhelminthes are either free living or parasitic. They are triploblastic animals. Platyhelminthes get their name from two Greek words - “platy,” meaning “flat,” and “helminthes,” meaning “worms”.e.g. Planaria. *Nematoda are bilaterally symmetrical, triploblastic parasitic worms. Nematoda get their name from two Greek words - “nema,” which means “thread,” and “ode,” which means “like”. Nematodes can be free living or parasitic. e.g. Ascaris. *Annelida are bilaterally symmetrical, triploblastic, schizocoelomates with segmented body. Annelida get their name from the Latin word “anellus,” which means "little ring". Annelids are characterised by the presence of a circulatory system. e.g. Earthworm *Arthropoda are bilaterally symmetrical, triploblastic animals with true coelom. Arthropoda means “joint legs”. This phylum gets its name from the Greek words arthron, meaning “joint”, and podos, meaning “foot”. e.g. Insects. These insects breathe through their tracheae. Their circulatory system is open, so blood does not flow through blood vessels. *Molluscs are bilaterally symmetrical, triploblastic gastropods with reduced coelom. Mollusca is derived from a Latin word, which means “thin-shelled and soft”. Locomotion in molluscs is by means of a muscular foot. Water molluscs breathe through their gills, while land molluscs have lungs and their circulatory system is open. *Echinodermata are triploblastic animals with true coelomic cavity. Echinodermata are spiny skinned organisms which get their name from the Greek words “echinos,” meaning protective “spines,” and “derma,” meaning “skin”. Skeletons of echinoderms are hard calcium carbonates. They exhibit radial symmetry. Protochordata: These are the organisms belonging to the phylum Chordata, and are primitive chordates. Protochordates possess a notochord during their early stage of development. The notochord is a long rod-like support that runs all along the back of the animal separating the nervous tissue from the gut. e.g.Balanoglossus, Herdmania. Vertebrata: These are the most advanced group of animals with true vertebral column and strong endoskeleton. Vertebrates are grouped into different classes based on bilateral symmetry, notochord, dorsal nerve cord, paired gill pouches, triploblastic, and coelomate. These classes are Pisces, Amphibia, Reptilia, Aves and Mammalia. *Pisces includes all fish. These are aquatic cold blooded organisms with a spindle-shaped body covered by scales. Fish breathe through their gills. Skeleton may be cartilaginous or bony in nature. Fish comprise two-chambered heart and reproduce by laying eggs. *Amphibians are cold-blooded animals. Amphibians can live both on land and in water. They are the first vertebrates to have four limbs, each with five digits and are called tetrapods. Respiration is by skin and lungs. They possess a three-chambered heart. Amphibians reproduce by laying eggs. *Reptilia are cold-blooded animals. They have four limbs with five fingers or toes each, and hence, are called pentadactyle tetrapods. Respiration is through lungs. Hearts are three-chambered except for crocodiles. Reptiles also reproduce by laying eggs. *Aves are warm-blooded animals. Birds bear three clawless digits. Fore-limbs are modified into wings which aid in flight. Their hind limbs are strong and are developed for walking. Bones are hollow. Body is covered by feathers. Respiration is through lungs.

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