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locomotion in annelida before we discuss the details of locomotion in annelids we have to recapitulate the major subdivisions of the phylum annelida
variety of locomotiona number of animals are sendentary remaining attached to some substratum these animals may move parts of their body but this
locomotionall animals simple or complex are able of performing necessary bodily functions one of these functions is locomotion motility is one of the
advantages of metagenesis in cnidaria in this you have studied that a huge number of cnidarian colonies are polymorphic and exhibit alternation of
skeleton - animal kingdomyou all know that the skeleton forms the framework of the body of different organisms in the animal kingdom besides giving
class holothuroidea body cucumber-such as no arms no spines no pedicellariae ossicles minute and embedded in muscular wall anus present tube feet
reproductive system of asteroideasexes are separate in several asteroids there are ten 10 gonads two in each arm they emerge tuft-like or as cluster
nervous system of asteroideathe nervous system of steroids is not ganglionated and is closely related with epidermis it consists mainly of a
circulation respiration and excretion of asteroideaasteroids depend upon the circulation of coelomic fluid for the transport of gases and some
digestive system of class asteroideamost asteroids are scavengers or carnivores and feed on snails bivalves polychaets other echinoderms fish sponges
class bivalvia body in a bilohed mantle enclosed in a two-valved shell head reduced mouth with labial palps but no radula foot wedge-shaped
class gastropodabody asymmetrical depicts torsion or its effects shell coiled in most well developed head with radula large flat foot gills one or
class of mollusca - aplacophora worm-like no shell head or excretory organs mantle with chitinous cuticle or scales or spicules mantle cavity
class of mollusca - monoplacophora bilaterally symmetrical with broad flat foot and single shell mantle cavity has five to six pairs of gills six
class of subphylum uniramia - insectaclass insecta consists of nearly a million described species there are more species of insects as compared to
class of subphylum uniramia - symphylasymphyla is yet other small myriapodous group that includes around 160 described species these are also soil
class of subphylum uniramia - pauropodaa small group of uniramians there are 500 species of pauropoda explained so far the minute organisms computing
class of subphylum uniramia - chilopoda chilopoda have the centipedes the class contains some 2500 species that have been described so far they
subphylum uniramia uniramia the largest subphylum of phylum arthropods includes myriapods and insects due to the unbranched nature of the appendages
class of crustacea - malacostracamalacostraca involves most of the larger forms such as crabs lobsters shrimps etc and constitute the majority of
class of crustacea - cirripediathese crustaceans are completely marine and include the barnacles moa species are free living attached to rock and
class of crustacea - branchiurabranchiura involves only around 130 species of ectoparasitic crustaceans living mostly on the integument and gill
class of crustacea - copepodacopepoda is a huge class of small 1-5mm crustaceans occupying both marine and freshwater environments copepods form the
class pycnogonida of phylum arthropodameasures generally 3-4 mm body chiefly made up of cephalothorax abdomen being very small generally four pairs
class arachnida of phylum arthropodabody divided into cephalothorax and abdomen cephalothorax along with four 4 pairs of legs abdomen segmented or