Animal Kingdom
Which of the following cell type is capable of giving rise to other cell types in sponges?
Thesocytes
Pinacocytes
Cnidocytes
Archaeocytes
D.
Archaeocytes
Archaeocytes are the totipotent cells, which provide great regenerating power to sponges. Sex cells (sperm and ova arise from undifferentiated archaeocytes).
Thesocytes are the amoebocytes with reserve food granules.
Pinacocytes are the polygonal flat cells present as outer layer of cells, called pinacoderm lining the spongocoel or body cavity in Leucosolenia.
Cnidocytes occur in entire epidermis except that of basal disc and are found only in cnidarians. These are spherical or oval cells.
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How useful is the study of the nature of body cavity and coelom in the classification of animals?
Distinguish between intracellular and extracellular digestion?
What is the difference between direct and indirect development?
What are the peculiar features that you find in parasitic platyhelminthes?
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