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Notes - Phylum-Platyhelminthes

  Phylum-Platyhelminthes     Phylum Platyhelminthes.   (i) Introduction : Bilateral and protostominal ?organ grade? eumetazoans without a body cavity (acoelomates). ?Platyhelminthes? means flatworms (Gr., platys = flat; helmins = worms); their body is dorsoventrally flattened. About 10,000 species known. more...
Catgeory: NEET

Notes - Phylum-Nemathelminthes

  Phylum-Nemathelminthes    Phylum Nematoda (= Nemathelminthes).   (i) Introduction : Bilateral and protostomial ?organ grade? eumetazoans in which the space between body wall and alimentary canal is a false body cavity, or pseudocoel, derived from embryonic blastocoel. The term ?Nematoda? literally means ?threadworms? or ?roundworms? (Gr., nema = thread + eidos = form). About 12,000 species known. more...
Catgeory: NEET

Notes - Phylum-Annelida

  Phylum-Annelida   Phylum Annelida.   (i) Introduction : Bilateral and protostomial eucoelomate eumetazoans whose long, narrow and worm like body is divided into ring-like, true or metameric segments (Gr., annelus = little ring), and the skin usually bears unjointed, chitinous appendages, termed setae. Commonly known as ?segmented worms?. About 9,000 species known. more...
Catgeory: NEET

Notes - Phylum- Arthropoda

Phylum-Arthopoda   Phylum Arthropoda.   (i) Introduction : Bilateral and protostomial eucoelomate eumetazoa with metamerically segmented body and each segment bearing a pair of jointed locomotory appendages. ?Arthopoda? literally means animals bearing jointed feet (Gr., arthron = jointed + podos = foot). These are extremely successful animals due to a protective exoskeleton and jointed appendages. That is why, more than  lac arthropod more...
Catgeory: NEET

Notes - Phylum Mollusca

  Phylum-Mollusca     Phylum Mollusca.   (i) Introduction : Basically bilateral and protostomial eucoelomate eumetazoans whose soft body (L., mollis or molluscum = soft) is unsegmented and enclosed within a skin?fold (mantle) which usually secretes a calcareous shell. more...
Catgeory: NEET

Notes - Phylum Echinodermata

  Phylum-Echinodermata    Phylum Echinodermata.   (i) Introduction : Bilateral and deuterostomial eucoelomate eumetazoa with rough, tough and leathery skin due to dermal skeleton of usually spiny, calcareous ossicles; and the basic bilateral symmetry of larva modified, in the adult, to a pentamerous radial symmetry. The term ?Echinodermata? means spiny skin (Gr., echinos = spiny more...
Catgeory: NEET

Notes - Phylum Chordata

  Chordata    Chordata.               (i) General Characters of Phylum Chordata             (1) Aquatic, aerial or terrestrial. All free-living with no fully parasitic forms.             (2) Body small to large, bilaterally symmetrical and metamerically segmented. more...
Catgeory: NEET

Notes - Class-Pisces

  Superclass Pisces                                                                     Superclass Pisces.                         more...
Catgeory: NEET

Notes - Class Amphibia

  Class-Amphibia      Class Amphibia.             (i) General characters (1) Aquatic or semi aquatic (freshwater), air and water breathing, carnivorous, cold?blooded, oviparous, tetrapod vertebrates.             (2) Head distinct, trunk elongated. Neck and tail may be present or absent. more...
Catgeory: NEET

Notes - Class-Reptilia

  Class-Reptilia   Class Reptilia.   (i) General Characters: Reptiles represent the first class of vertebrates fully adapted for life in dry places on land. They have no obvious diagnostic characteristics of their own that immediately separate them for other classes of vertebrates. The characters of reptiles are in fact a combination of characters that are found in fish and amphibians on more...
Catgeory: NEET

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