DEFINITIONS AND KEY POINTS FOR OBJECTIVES

DEFINITIONS AND KEY POINTS FOR OBJECTIVES


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       TERMS                                              DEFINITIONS
Coelom A coelom is a body cavity that arises in mesoderm and is lined by a sheet of mesoderm called the peritoneum.
Protostomes The   animals     in    which    blastopore      tbrin    mouth    are    called
Deutrostomes The animals in which blastopore forms anus and mouth formed as a secondary opening are called deutrostomes.
Schizocoelous  The animals which are formed by the splitting of mesoderm are called schizocoelous.
Enterocoelous The animals in which coelom are formed by invagination of enteron or gut are called enterocoeious.
Mantle Mantle of molluscs is attached to the visceral mass. It enfolds most of the body. It secreted a shell that overlies the mantle.
Tuksion Torsion is a 180°, counterclockwise twisting of the visceral mass. mantle, and mantle cavity.
Protandric   In this case. testes develop first, and after they degenerate. Then ovaries become mature.
Valves The two convex halves of the shell are called valves.
  Umbo The oldest part of the shell is called umbo. Umbo is a swollen area near the shell’s anterior margin.
Pseudofeces The rejected material, called pseudofeces.
Peln The shell of a squid is reduced. It has internal, chitinous structure called the pen.

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