Q. No.| List I | List II | ||
| A. | Pleurobrachia | I. | Mollusca |
| B. | Radula | II. | Ctenophora |
| C. | Stomochord | III. | Osteichthyes |
| D. | Air bladder | IV. | Hemichordata |
Choose the correct answer from the options given below:
1. A-II, B-I, C-IV, D-III
2. A-II, B-IV, C-I, D-III
3. A-IV, B-III, C-II, D-I
4. A-IV, B-II, C-III, D-I
Consider the following features:
A: Organ system level of organisation
B: Bilateral symmetry
C: True coelom with segmentation of body
Select the correct option of animal groups that possess all the above characteristics:
| 1. | Annelida, Mollusca and Chordata |
| 2. | Annelida, Arthropoda and Chordata |
| 3. | Annelida, Arthropoda and Mollusca |
| 4. | Arthropoda, Mollusca and Chordata |
Which of the following character is not found in all the chordates:
1. Diaphragm
2. Coelom
3. Pharyngeal gill clifts
4. Dorsal nerve cord
Crocodile and Penguin are similar to Whale and Dogfish in which one of the following features?
1. Lay eggs and guard them till they hatch
2. Possess bony skeleton
3. Have gill slits at some stage
4. Possess a solid single-stranded central nervous system
A. Pharynx is perforated by gill slits.
B. Notochord is absent.
C. Central nervous system is dorsal.
D. Heart is dorsal if present.
F. Post anal tail is absent.
Choose the most appropriate answer from the options given below:
1. A, B & D only
2. B, D & E only
3. B, C & D only
4. A & C only
In which of the following animal post-anal tail is found:
1. Earthworm
2. Lower invertebrate
3. Scorpion
4. Snake
In which of the following, the notochord is present in the embryonic stage?
| 1. | All chordates | 2. | Some chordates |
| 3. | Vertebrates | 4. | Non-chordates |
Which one of the following statements is totally wrong about the occurrence of a notochord, while the other three are correct?
| 1. | It is present throughout life in Amphioxus |
| 2. | It is present only in larval tails in Ascidians |
| 3. | It is replaced by the vertebral column in an adult frog |
| 4. | It is absent throughout life in humans from the very beginning |
| A: | Presence of a mid-dorsal, solid and double nerve cord. |
| B: | Presence of closed circulatory system. |
| C: | Presence of paired pharyngeal gill slits |
| D: | Presence of dorsal heart. |
| E: | Triploblastic pseudocoelomate animals. |
| 1. | C, D and E only | 2. | A, C and D only |
| 3. | B and C only | 4. | B, D and E only |
| Assertion (A): | All vertebrates are chordates but all chordates are not vertebrates. |
| Reason (R): | Notochord is replaced by vertebral column in the adult vertebrates. |
| 1. | (A) is False but (R) is True. |
| 2. | Both (A) and (R) are True and (R) correctly explains (A). |
| 3. | Both (A) and (R) are True and (R) does not correctly explain (A). |
| 4. | (A) is True but (R) is False. |
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