- 1(current)
Q. No.Notochord is:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | an endodermally derived rod-like structure. |
| II: | formed on the dorsal side during embryonic development in some animals. |
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: Â Phylum Chordata |
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Level 2: 60%+
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Consider the given two statements:
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
| Statement I: | All vertebrates are chordates but all chordates are not vertebrates. |
| Statement II: | All vertebrates are tetrapods. |
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: Â Phylum Chordata |
 75%
Level 2: 60%+
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Which statement correctly differentiates between Urochordates and Cephalochordates?
| 1. | Urochordates retain their notochord throughout their life, whereas Cephalochordates lose their notochord during the larval stage. |
| 2. | Cephalochordates, such as lancelets, retain a notochord extending the full length of their body into adulthood, whereas Urochordates, like tunicates, only possess a notochord during their larval stage. |
| 3. | Both Urochordates and Cephalochordates exhibit a complex nervous system comparable to that of higher vertebrates. |
| 4. | Urochordates are primarily terrestrial, whereas Cephalochordates are exclusively aquatic. |
Subtopic: Â Phylum Chordata |
 87%
Level 1: 80%+
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Which statement about circulatory systems is correct?
| 1. | All vertebrates have an open circulatory system. |
| 2. | Invertebrates have a closed circulatory system, while vertebrates have an open system. |
| 3. | Mollusks and arthropods typically exhibit a closed circulatory system. |
| 4. | Mammals have a closed circulatory system, while insects have an open system. |
Subtopic: Â Phylum Chordata |Â Basis of Classification |
 90%
Level 1: 80%+
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