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| 21. |
Canal system is found in which of these: |
| A. |
Star-fishes |
B. |
Sponges |
| C. |
Corals |
D. |
All of these |
Answer: Option B
Explanation:
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| 22. |
Cells secreting calcareous spicules are called: |
| A. |
Nematocysts |
B. |
Archacocytes |
| C. |
Calcoblasts |
D. |
Desmocytes |
Answer: Option C
Explanation:
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| 23. |
Cells forming siliceous spicules are called: |
| A. |
Spongioblasts |
B. |
Calcoblasts |
| C. |
Silicoblasts |
D. |
Osteoblasts |
Answer: Option C
Explanation:
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| 24. |
Spongin fibres are secreted by which of these: |
| A. |
Calcoblasts |
B. |
Silicoblasts |
| C. |
Spongioblasts |
D. |
None of these |
Answer: Option C
Explanation:
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| 25. |
Sleleton forming cells are called: |
| A. |
Scleroblasts |
B. |
Cnidoblasts |
| C. |
Collencytes |
D. |
Desmacytes |
Answer: Option A
Explanation:
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| 26. |
Water enters the body of sponges through: |
| A. |
Ostia |
B. |
Osculum |
| C. |
Radial Canals |
D. |
Spongocoel |
Answer: Option A
Explanation:
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| 27. |
Cells characteristic of sponges are: |
| A. |
Nematocysts |
B. |
Choanocytes |
| C. |
Epithelial cells |
D. |
Amoebocytes |
Answer: Option B
Explanation:
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| 28. |
Choanocytes are present in sponges in: |
| A. |
Inner layer |
B. |
Outer layer |
| C. |
Both (a) & (b) |
D. |
None of these |
Answer: Option A
Explanation:
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| 29. |
Cells ingesting food in Leucosolenia and other sponges are: |
| A. |
Pinacocytes |
B. |
Choanocytes |
| C. |
Porocytes |
D. |
Trophocytes |
Answer: Option B
Explanation:
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| 30. |
Cells found only in sponges and not in other metazoa are: |
| A. |
Nematocysts |
B. |
Nematoblasts |
| C. |
Choanocytes |
D. |
Chondriocytes |
Answer: Option C
Explanation:
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