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Q. No.A defining feature in animals of phylum Cnidaria will be:
1. radial symmetry
2. alternation of generations
3. tentacles with stinging cells
4. bioluminescence
Subtopic: Phylum Coelenterata |
56%
From NCERT
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The exoskeleton of arthropods, fungal cell wall and radula of molluscs is primarily composed of:
| 1. | Calcium carbonate | 2. | Chitin |
| 3. | Collagen | 4. | Silica |
Subtopic: Phylum Arthropoda | Phylum Mollusca |
90%
From NCERT
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All Porifers:
1. are marine animals
2. are radially symmetrical
3. reproduce only sexually
4. have cellular grade of organization
1. are marine animals
2. are radially symmetrical
3. reproduce only sexually
4. have cellular grade of organization
Subtopic: Basis of Classification |
88%
From NCERT
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Physalia (Portuguese man-of-war), Adamsia (Sea anemone), Pennatula (Sea-pen), Gorgonia (Sea-fan) and Meandrina (Brain coral) all belong to:
| 1. | Sponges | 2. | Cnidaria |
| 3. | Mollusca | 4. | Echinodermata |
Subtopic: Phylum Coelenterata |
91%
From NCERT
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Consider the given two statements:
| Assertion(A): | Muscle tissue is not seen in diploblastic animals. |
| Reason (R): | An undifferentiated layer, mesoglea, is present in between the ectoderm and endoderm in diploblastic animals. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 3. | (A) is True; (R) is False |
| 4. | Both (A) and (R) are False |
Subtopic: Phylum Coelenterata |
From NCERT
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| Statement I: | In Cnidarians, polyp is a sessile and in cylindrical form and medusa is umbrella-shaped and free-swimming. |
| Statement II: | In Cnidarians, polyps produce medusae asexually and medusae form the polyps sexually. |
| 1. | Statement I is correct; Statement II is correct |
| 2. | Statement I is correct; Statement II is incorrect |
| 3. | Statement I is incorrect; Statement II is correct |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: Phylum Coelenterata |
90%
From NCERT
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Subtopic: Phylum Coelenterata | Phylum Mollusca |
80%
From NCERT
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Amphibians are not characterised by the presence of:
1. Dry skin, with placoid scales
2. Eyelids
3. A tympanum
4. Three-chambered heart
1. Dry skin, with placoid scales
2. Eyelids
3. A tympanum
4. Three-chambered heart
Subtopic: Study of Amphibians |
77%
From NCERT
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Crocodiles:
| I: | have a four chambered heart. |
| II: | are endotherms. |
| 1. | Only I is correct |
| 2. | Only II is correct |
| 3. | Both I and II are correct |
| 4. | Both I and II are incorrect |
Subtopic: Study of Reptilia |
69%
From NCERT
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Ornithorhynchus is:
1. a flightless bird
2. a limbless amphibian
3. an egg laying mammal
4. an extinct reptile that was direct ancestor of mammals
1. a flightless bird
2. a limbless amphibian
3. an egg laying mammal
4. an extinct reptile that was direct ancestor of mammals
Subtopic: Study of Aves & Mammals |
77%
From NCERT
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