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41. |
Dermal surface of Euplectella is made by: |
A. |
Pinacocytes |
B. |
Epithelial cells |
C. |
Sponging fibres |
D. |
Synegtial mass of amoeboid cells |
Answer: Option D
Explanation:
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42. |
In Scypha the choanocytes are found in the: |
A. |
Incurrent canals |
B. |
Radial canals |
C. |
Spongocoel |
D. |
None of these |
Answer: Option B
Explanation:
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43. |
Choanocytes are found lining whole of spongocoel in : |
A. |
Leucosolenia |
B. |
Scypha |
C. |
Both (a) & (b) |
D. |
None of these |
Answer: Option A
Explanation:
|
44. |
Exit for water current in sponges is: |
A. |
Ostia |
B. |
Osculum |
C. |
Cloaca |
D. |
None of these |
Answer: Option B
Explanation:
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45. |
Endoskeleton in sponges is made up of: |
A. |
Calcareous spicules only |
B. |
Silicious spicules |
C. |
Spongin fibres |
D. |
All of these |
Answer: Option D
Explanation:
|
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 |
Answer: Option D
Explanation:
|
47. |
Porocytes are specialized cells found exclusively in: |
A. |
Cnidarians |
B. |
Sponges |
C. |
Molluscs |
D. |
Echinoderms |
Answer: Option B
Explanation:
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48. |
Common bath spong' is |
A. |
Hyalonema |
B. |
Euspongia |
C. |
Euplectella |
D. |
Spongilla |
Answer: Option B
Explanation:
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49. |
Boring spong' is: |
A. |
Cliona |
B. |
Euplectella |
C. |
Scyha |
D. |
None of these |
Answer: Option A
Explanation:
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50. |
Cells not found in the sponges are: |
A. |
Cnidoblasts |
B. |
Calcoblasts |
C. |
Myocytes |
D. |
Porocytes |
Answer: Option A
Explanation:
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