Practicals Flashcards
if the objective is x4, how big is the field of view in the microscope?
4.5mm
if the field of view is 0.45mm what is the objective?
x40
if the objective is x10 what is the field of view
1.8mm
What are the three classes of porifera?
Calcera, hexatinellida and Demospongiae
How is the class Calcarea characterised?
as calcareous sponges, with spicules made of calcium carbonate
non differentiated spicules
How is the class Hexactinellida characterised?
They are called glass sponges with siliceous spicules.
synctial outer cell layer
megascleres and microscleres
How is the Demospongiae class classified?
They have Siliceous spicules and spongin
with mona, tri and tetraoxinoid spicules
Also round flagellated chambers
megascleres and microscleres
what are megascleres and microscleres
big and little spicules
Name a genus from Calcerea
Sycon
Name a genus from hexactinellida
Euplectella
