OBJECTIVES
saadiaOBJECTIVES Multiple Choice Questions MCQs 1. Number of speeies of Phylum Platyhelminthes are: (a) 10,000 (b) 15,000 (c) 20,000 (d) 25,000 2. Parenchyma is derived from: (a) Ectoderm (b) Mesoderm …
SUBJECTIVE QUESTIONS
SUBJECTIVE QUESTIONS Give evolution of Platyhelminthes, Nemertea, and Gastrotricha. Give general characteristics of phylum Platyhelminthes. Describe classification of Phylum Platyhelminthes. Write note on body wall of turbellarians. Write note on…
DEFINITIONS AND KEY POINTS FOR OBJECTIVES
DEFINITIONS AND KEY POINTS FOR OBJECTIVES TERMS DEFINITIONS Paedomorphosis Sexual maturity in a larval body form is called paedomorphosis. Zooids The two (or more) animals formed as a result of…
FURTHER PHYLOGENETIC CONSIDERATIONS
FURTHER PHYLOGENETIC CONSIDERATIONS There are different views about the evolution of platyhelminthes: Zoologists believe that the platyhelminthes body form is central to animal evolution. They believe that an ancestral flatworm…
PHYLUM GASTROTRICHA (Or. gastros, stomach i- trichos, hair)
PHYLUM GASTROTRICHA (Or. gastros, stomach i- trichos, hair) They have about live hundred free- living marine and freshwater species. They live in the space between bottom sediments. Their size is…
PHYLUM NEMERTEA
PHYLUM NEMERTEA There are nine hundred species of nemerteans. They are elongate, flattened worms. They are found in marine mud and sand. They have a long proboscis. Therefore, nemerteans are…
CLASS CESTOIDEA: THE TAPEWORMS
CLASS CESTOIDEA: THE TAPEWORMS It is the most highly specialized class of flatworms. The members of cestoidae are commonly called tapeworms. It has 3,500 species. All are endoparasites. They live…
Class Trematoda : Flukes (trematodes, perforated form)
CLASS TREMATODA: Flukes (trematodes, perforated form) This class has eight thousand species of parasitic flatworms. Trematoda are collectively called flukes. They are wide and flat shaped. 1. Habitat: Almost all…
Class Monogenea life cycle and Organs
CLASS MONOGENEA Monogenetic flukes have only one generation in their life cycle. Thus one adult develops from one egg. Therefore, these animals are named as monogenetic. Monogeneans are mostly external…
Class Turbellaria : The free living flat worms
CLASS TURBELLARIA: THE FREE LIVING FLATWORMS Members of this class are mostly free-living. They are bottom dwellers in freshwater and marine environments. They crawl on stones, sand, or vegetation. Turbellarians…