Chapter 6 : MOLLUSCAN SUCCESS
saadiaMOLLUSCAN SUCCESS EVOLUTIONARY PERSPECTIVE Some of the molluscs like octopuses, squids, and cuttlefish (the cephalopods) are most adapted predators. The evolution of large brains in them takes place due to…
OBJECTIVES
OBJECTIVES Multiple Choice Questions MCQs 1. Which is irrelevant for aschelminths? (a) Cutely (b) Mesenteries (c) Protonephridia (d) Cephalization 2. The constant number of cell in an organ or tissue…
SUBJECTIVE QUESTIONS
SUBJECTIVE QUESTIONS Discuss evolutionary perspective of the Aschelminthes. Give general characteristics of Aschelminthes. Give general characteristics of Rotifera. Describe external features of Rotifers. Discuss feeding and digestive system in Rotifers.…
DEFINITIONS & KEY POINTS FOR OBJECTIVES
DEFINITIONS & KEY POINTS FOR OBJECTIVES TERMS DEFINITIONS Cutely In this case, numbers of cells are constant in the entire animal and in each given organ in all…
FURTHER PHYLOGENETIC CONSIDERATIONS
FURTHER PHYLOGENETIC CONSIDERATIONS The aschelminths are diverse animals. They have common cuticle, pseudocoelom, muscular pharynx and adhesive glands. But no distinctive features in every phylum. 1. Origin of Rotifers The…
PHYLUM PRIAPULIDA
PHYLUM PRIAPULIDA (priapos, phallus, Creek god of reproduction symbolized by the penis) 1. Habitat: The priapulids are a small group. It has only 16 species of marine worms found in…
PHYLUM LORICIFERA (Lorica, clothed in armor + ferro, to bear)
PHYLUM LORICIFERA (Lorica, clothed in armor + ferro, to bear) The phylum Loricifera is a recently described animal phylum. Zoologists have described !about 14 species of Loriciferans. Its first members…
Phylum Acanthocephala (akantha, spine + kephale, head)
PHYLUM ACANTHOCEPHALA (akantha, spine + kephale, head) 1.Habitat: Adult acanthocephalans are endoparasite in the intestinal tract of vertebrates (especially fishes). They complete their life cycle in two hosts. The juveniles…
PHYLUM NEMATOMORPHA
PHYLUM NEMATOMORPHA(nema, thread + morphe, form) Nematomorphs are a small group of about 250 species. They are elongated worms. They are commonly called horsehair worms or Gordian worms. Habitat: The…
Write a brief overview of the endocrine system of
rubab(a) cnidarians' (b) platyhelminths (c) nemerteans (d) nematodes and (e) annelids. (a) Cnidarians The nerve cells of Hydra contain a growth promoting hormone that stimulates budding, regeneration, and growth. For…