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. |
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. |
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 |
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. |
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. |
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. |
1. | Metamerism first developed in Arthropoda |
2. | Triploblastic animals lacking coelom are platyhelminths and annelids |
3. | Coelomate animals in which blastopore forms anus are grouped under deuterostomes |
4. | Coelom is the body cavity found between ectoderm and outer body wall |
1. | Archaeopteryx is thought to be the transitional fossil between dinosaurs and birds since, like birds Archaeopteryx had feathers and a fused collar-bone indicating the flying ability |
2. | Cloaca is present in Balenoptera |
3. | In Physalia, digestion is first extracellular and then intracellular digestion occurs |
4. | Both (1) and (3) |
1. | Branchostoma : Notochord persist through out the life |
2. | Ascidia : Notochord present in larva and disappears in adult |
3. | Doliolum : Notochord present in the larval tail only |
4. | More than one option is correct |