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Q. No.Assertion (A) : In Mollusca, feathers like gills are present in the mantle cavity.
Reason (R) : These gills have respiratory and excretory functions.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Phylum Mollusca |
61%
From NCERT
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| Assertion (A): | Claspers are present in males of the class Chondrichthyes. |
| Reason (R): | Claspers assist copulation. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Comparative study of Cartilagenous & Bony Fishes |
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Assertion (A) : The organisms of Platyhelminths are usually hermaphrodites.
Reason (R) : These organisms possess internal as well as external fertilization.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Reason (R) : These organisms possess internal as well as external fertilization.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Phylum Ctenophora & Platyhelminthes |
68%
From NCERT
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Assertion (A) : Teeth of mammals are heterodont.
Reason (R) : Mammals possess more than a single tooth morphology.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Reason (R) : Mammals possess more than a single tooth morphology.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Study of Aves & Mammals |
72%
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Assertion (A) : Reptiles are poikilotherms.
Reason (R) : Reptiles possess eggs with shells which helped them to adapt in land environment.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Reason (R) : Reptiles possess eggs with shells which helped them to adapt in land environment.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Study of Reptilia |
81%
From NCERT
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Assertion (A): Echinoderms possess an endoskeleton of calcareous ossicles.
Reason (R): These organisms are marine or freshwater dwellings.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Reason (R): These organisms are marine or freshwater dwellings.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Phylum Echinodermata |
69%
From NCERT
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Assertion (A): Balanoglossus possess external fertilization.
Reason (R): Saccoglossus undergo direct development during their life cycle.
1. If both assertion and reason are true, the reason is the correct explanation of the assertion.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Reason (R): Saccoglossus undergo direct development during their life cycle.
1. If both assertion and reason are true, the reason is the correct explanation of the assertion.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Phylum Hemichordata |
66%
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Assertion (A): Aschelminths and Annelids possess bilateral symmetry.
Reason (R): Both Aschelminths and Annelids are coelomates
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Reason (R): Both Aschelminths and Annelids are coelomates
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Phylum Annelida | Phylum Arthropoda |
80%
From NCERT
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| Assertion (A): | Choanocytes or collar cells line the spongocoel and the canals in poriferans. |
| Reason (R): | Poriferans possess spicules and spongin fibres. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Phylum Porifera |
80%
From NCERT
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Assertion (A): All vertebrates are chordates but all the chordates are not vertebrates.
Reason (R): All the vertebrates are characterised by the presence of a notochord, a dorsal hollow nerve cord and paired pharyngeal gill slits at some stages of the life cycle.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Reason (R): All the vertebrates are characterised by the presence of a notochord, a dorsal hollow nerve cord and paired pharyngeal gill slits at some stages of the life cycle.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic: General Introduction: Vertebrates & Agnatha |
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