Q. No.Subtopic: Â Phylum Coelenterata |
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Subtopic: Â Phylum Coelenterata |
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Few cnidarians like corals have a skeleton composed of
1. Calcium hydroxide
2. Calcium sulphate
3. Calcium carbonate
4. Sodium bicarbonate
1. Calcium hydroxide
2. Calcium sulphate
3. Calcium carbonate
4. Sodium bicarbonate
Subtopic: Â Phylum Coelenterata |
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The given figure shows:
| 1. | cells seen in the lining of canals of sponges |
| 2. | adhesive cells, unique to ctenophores |
| 3. | cells used for anchorage, defense and capture of prey in Cnidarians |
| 4. | cells involved in osmoregulation and excretion in flat worms |
Subtopic: Â Phylum Coelenterata |
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Which of the following germinal layer is absent in Cnidarians
| 1. | Ectoderm | 2. | Endoderm |
| 3. | Mesoderm | 4. | Both 2 and 3 |
Subtopic: Â Phylum Coelenterata |
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Cnidarians exist in two basic body forms: polyp and medusa. Some cnidarians, like Obelia, alternate between these two forms in a process called metagenesis. In this process:
| 1. | Polyps reproduce sexually, forming medusae. |
| 2. | Medusae reproduce asexually, forming polyps. |
| 3. | Medusae reproduce sexually, forming polyps, while polyps reproduce asexually, forming medusae. |
| 4. | Both polyps and medusae reproduce asexually. |
Subtopic: Â Phylum Coelenterata |
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A sort of alternation and generation seen in Cnidarians is termed:
| 1. | Metamorphosis | 2. | Epiboly |
| 3. | Metagenesis | 4. | Anagenesis |
Subtopic: Â Phylum Coelenterata |
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Which of the following is incorrect statement
1. Polyp produce medusae asexually
2. Medusae produce polyp sexually
3. Polyp produce medusae sexually
4. Obelia shows metagenesis
Subtopic: Â Phylum Coelenterata |
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Cnidocytes contain stinging organelles known as:
1. Nematocysts
2. Lophophores
3. Statocysts
4. Trochophores
1. Nematocysts
2. Lophophores
3. Statocysts
4. Trochophores
Subtopic: Â Phylum Coelenterata |
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A cnidarian receives nutrients and oxygen, by diffusion, from its
1. blood vessels.
2. lymph vessels.
3. gastrovascular cavity.
4. book lungs and villi.
1. blood vessels.
2. lymph vessels.
3. gastrovascular cavity.
4. book lungs and villi.
Subtopic: Â Phylum Coelenterata |
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