Zoology for UPSC and State PSC exams
Your blog category
Life Cycle Unique among Nematodes, because they require transmission through skin by a blood-sucking parasite. Larval Development in Man:Female is viviparous, releasing numerous juveniles called Microfilariae.Born in a very immature…
General Description Commonly called as human roundworm.One of the most common and best known gastro-intestinal parasites.Body is elongate, cylindrical and gradually tapering at both ends.Sexes are separate with distinct sexual…
Widely distributed. Aquatic or Terrestrial. Parasitic or Free living.Body elongated, cylindrical, unsegmented, worm-like, bilaterally symmetrical.Triploblastic body. Organ system grade of organisation.Body wall with thick resistant cuticle, cellular or syncytial epidermis…
General Features Adult dwells as internal parasite in the small intestine of man, where it is anchored to intestinal mucosa by its scolex.Larval stage occurs in the tissues of a…
General Features External FeaturesBody is soft and oval in outline, dorso-ventrally flattened and leaf like.Anterior end of body has a prominent oral projection, bearing a triangular aperture (mouth).Suckers are devoid…
Morphological Adaptations:Body Covering: Thick tegument, frequently provided with scales. Possibly continuously renewed by mesenchymal cells.Adhesion: Suckers, hooks and spines.Locomotion: Locomotory structures like Cilia are absent in adult, but present in…
Turbellaria (Planarians) Trematoda (Flukes) Cestoda (Tapeworms) Non-parasitic free living worms,called Planarians.Terrestrial, marine or freshwater.Body unsegmented.Suckers absent. Chemo and Photoreceptors are present.Body unsegmented, flattenedand covered in ciliated epidermis.Mostly hermaphroditic.Some reproduce asexually.Development…
Free living, commensal or parasitic forms.Tissue level grade of organisation.Triploblastic: Body derived from 3 embryonic germ layers.Bilaterally symmetrical with definite polarity of anterior and posterior ends.Dorsoventrally flattened, with a well…
Medusa is the dominant and conspicuous form while the polypoid form is restricted to a short larval stageScyphistoma (polypoid stage) produces a series of disc like Ephyrae through transverse fission…
Marine, colonial, polypoid coelenterates which live in a secreted skeleton of their own.Calcareous skeleton is called the coral (secreted by epidermal cells).Belong to Class Hydrozoa and Anthozoa. Kinds of Coral…