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CSS :: Phylum Porifera


41.  Dermal surface of Euplectella is made by:
A. Pinacocytes B. Epithelial cells
C. Sponging fibres D. Synegtial mass of amoeboid cells

42.  In Scypha the choanocytes are found in the:
A. Incurrent canals B. Radial canals
C. Spongocoel D. None of these

43.  Choanocytes are found lining whole of spongocoel in :
A. Leucosolenia B. Scypha
C. Both (a) & (b) D. None of these

44.  Exit for water current in sponges is:
A. Ostia B. Osculum
C. Cloaca D. None of these

45.  Endoskeleton in sponges is made up of:
A. Calcareous spicules only B. Silicious spicules
C. Spongin fibres D. All of these

46.  Sponges need a constant current of water in order to perform:
A. Respiration B. Respiration and excretion
C. Respiration, excretion and nutrition D. Respiration, excretion, nutrition and reproduction

47.  Porocytes are specialized cells found exclusively in:
A. Cnidarians B. Sponges
C. Molluscs D. Echinoderms

48.  Common bath spong' is
A. Hyalonema B. Euspongia
C. Euplectella D. Spongilla

49.  Boring spong' is:
A. Cliona B. Euplectella
C. Scyha D. None of these

50.  Cells not found in the sponges are:
A. Cnidoblasts B. Calcoblasts
C. Myocytes D. Porocytes




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