OBJECTIVE OF THE ECHINODERMS
saadiaOBJECTIVE OF THE ECHINODERMS Multip e Choice Questions MCQs 1.The origin of ossicle is: (a) Ectoderm (b) Mesoderm (c) Endoderm (d) None 2. Hamel system is derived from: (a)Ectoderm (b)…
SUBJECTIVE QUESTION OF THE ECHINODERMS
SUBJECTIVE QUESTION OF THE ECHINODERMS 1.Describe evolutionary perspective of echinoderms. 2. Give characteristics of Echinoderm. 3. Give relationship of echinoderm with other phyla. 4. Discuss symmetery of echinoderms. 5.Write note…
DEFINITIONS AND KEY POINTS FOR OBJECTIVES
DEFINITIONS AND KEY POINTS FOR OBJECTIVES OF THE ECHINODERMS TERMS DEFINITIONS Filter feeder The animals ‘‘ Inch filter food particles form the \\ ater current are called filter feeders. Ossieles…
FURTHER PHYLOGENETIC CONSIDERATIONS IN THE ECHINODERMS
FURTHER PHYLOGENETIC CONSIDERATIONS IN THE ECHINODERMS Most zoologists believe that echinoderms evolved from bilaterally symmetrical ancestors. Radial symmetry was evolved during the transition from active to more sedentary lifestyles. The…
CLASS CRINOIDEA (krinon, lil + oekks, in the form of)
CLASS CRINOIDEA (krinon, lil + oekks, in the form of) Class Crinoidea includes the sea lilies and the leather stars. They are the most primitive living echinodemis. Therefore, they are…
Class Holothuroidea (holothourion, sea cucumber + cockles)
CLASS HOLOTHUROIDEA (holothourion, sea cucumber + cockles, in form of) 1. Habitat and size: The class Flolothuroidea has approximately 1.500 species. They are commonly called sea cucumbers. Most adults range…
CLASS ECHINOIDEA (Or. echinos, spiny + oeides, in the form of)
CLASS ECHINOIDEA (Or. echinos, spiny + oeides, in the form of) 1. Habitat The class Echinoidea is composed of sea urchins, sand dollars and heart urchins. Echinoidea has one thousand…
Class Ophiuroidea – Functions & Reproduction
CLASS OPHIUROIDEA (ophis, snake + ourn, tail + andes, in the form of) The class Ophiuroidea includes the basket stars and the brittle stars. It has two thousand species. Thus…
CLASS ASTEROIDEA (aster, star + oeides, in the form of)
CLASS ASTEROIDEA (aster, star + oeides, in the form of) The class Asteroidea contains sea stars. It has about 1,500 species. They live on hard substrates in marine environments. Some…
CLASSIFICATION OF ECHINODERMS
CLASSIFICATION OF ECHINODERMS The Echinoderms are triploblastic, coelomate animals. They have pentaradial symmetry in adults. They possess a water-vascular system. Their endoskeleton is covered by epithellium. Pedicellariae are present. Phylum…