CLASS CRINOIDEA (krinon, lil + oekks, in the form of)
saadiaCLASS 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…
Chapter 10 THE ECHINODERMS
THE ECHINODERMS EVOLUTIONARY PERSPECTIVE (Echino, spiny + derma, skin +am, to beer) The 400-million year-old Paleozoic rocks have almost all the fossils of the animals up to echinoderms. Many fossils…
OBJECTIVES OF HEXAPODA AND MYRIAPODA
OBJECTIVES OF HEXAPODA AND MYRIAPODA Multiple Choice Questions MCQs 1. Total number of describe insects are: i a) 650.000 (b) 750,000 (c) 850.000 (d) 950.000 2. The percentage of insects…
Answer of the Question of Endocrine System and Chemical Messengers
rubabAnswer of the Question of Endocrins System and Chemical Messengers Q.27. What hormones does adenohypophysis secrete? Describe the functions of: (a) Growth hormone (b) Thyrotropin (c) Adrenocorticotropic hormone Ans. The…
SUBJECTIVE QUESTIONS OF HEXAPODA AND MYRIAPODA
SUBJECTIVE QUESTIONS OF HEXAPODA AND MYRIAPODA Describe evolutionary perspective of insects. What factors does responsible for the success of insects? Describe external body features of insects. Give evolution of fight…