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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%
Level 2: 60%+
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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 | Class Chondrichthyes |
Level 3: 35%-60%
Hints
Given below are two statements:
| 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. |
Subtopic: Phylum Platyhelminthes |
69%
Level 2: 60%+
Hints
Given below are two statements:
| 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. |
Subtopic: Study of Aves & Mammals |
74%
Level 2: 60%+
Hints
| 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. |
Subtopic: Study of Reptilia |
80%
Level 1: 80%+
Hints
Given below are two statements:
| 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. |
Subtopic: Phylum Echinodermata |
68%
Level 2: 60%+
Hints
Consider the given two statements:
| Assertion (A): | Balanoglossus possess external fertilization. |
| Reason(R): | Saccoglossus undergo direct development during their life cycle. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A) |
| 2. | Both (A) and (R) are True and (R) does not correctly explain (A) |
| 3. | (A) is True, (R) is False |
| 4. | (A) is False, (R) is False |
Subtopic: Phylum Hemichordata |
68%
Level 2: 60%+
Hints
| 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. |
Subtopic: Phylum Annelida | Phylum Arthropoda |
80%
Level 1: 80%+
Hints
| 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 |
82%
Level 1: 80%+
Hints
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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. |
Subtopic: General Introduction: Vertebrates & Agnatha |
51%
Level 3: 35%-60%
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