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Q. No.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: Â General Introduction: Vertebrates & Agnatha |
From NCERT
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Choose the correct match:
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
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
Subtopic: Â Phylum Hemichordata |Â General Introduction: Vertebrates & Agnatha |
 82%
From NCERT
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Lampreys:
1. May or may not possess jaw
2. Is included in the division Agnatha where notochord is present only in the early stages
3. Possess an elongated body with gill slits for respiration
4. Are devoid of scales and possess paired fins
1. May or may not possess jaw
2. Is included in the division Agnatha where notochord is present only in the early stages
3. Possess an elongated body with gill slits for respiration
4. Are devoid of scales and possess paired fins
Subtopic: Â General Introduction: Vertebrates & Agnatha |
 52%
From NCERT
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