Bio-topics

Animals show following features- Body is spiny,  bilaterally symmetrical ,triploblastic,coelomate and "Pentaradiate (five rayed)". Digestion system is complete . Water vascular system is present and helps in  respiration and transportation in body. Tube feet help  in locomotion. Excretion takes place through body surface. Sexual reproduction is seen. Ex- Star-fish ,Sea- Urchin etc. Star-Fish Star-Fish (Anatomy)

Animals show following features- Body is bilaterally symmetrical ,triploblastic and with coelom . Body is soft and mostly enclosed in hard shell. Body is divided into head,foot and visceral mass. Muscular foot helps in locomotion. Digestion system is complete. Open circulation system is found. Respiration takes place through body surface or skin. Excretion takes place by metanephredia. Animals are hermaphrodite.  Example - Snail ,Unio,Octopus etc. Octopus  Snail Unio

Animals related to this phylum show features as-  Body is bilaterally symmetrical,triploblastic and with coelom. Body is divided in three parts i.e. head , thorax and abdomen. Body has jointed legs . Body is exoskeleton made of chitin. Digestive system is complete with a mouth and anus. Respiratory organs are “tracheae”. Eyes are compound. Antennae are tactile organs. Body cavity is called as “ hemocoel ”. Open circulatory system is present. Heart is dorsally placed. Sexes are separate . Larval stage is seen in life cycle.  Examples- Insects (Fly,Mosquito,Bedbug, etc ) Scorpion,Crab,Spider etc. Cockroach Prwan Some Arthropods

Features of animals related to this phylum are as - Body is triploblastic and bilaterally symmetrical. Body is   metamerically segmented. Body cavity is   coelom layered by mesoderm. Locomotion takes place by setae (in Earthworm ) and parapodia (In Nereis ). Digestive system is complete with mouth and anus. Gas exchange takes place through body wall. Circulation system is closed. Excretion takes place by “nephridia”. Some anneilids like Nereis are unisexual while some annelids like   Earthworm and Leech are hermaphrodite. Sexual reproduction is seen. Examples- Nereis ,Leeches and Earthworms. Earthworm Leech   Nereis