List I | List II | ||
A. | Pleurobrachia | I. | Mollusca |
B. | Radula | II. | Ctenophora |
C. | Stomochord | III. | Osteichthyes |
D. | Air bladder | IV. | Hemichordata |
List I | List II | ||
A. | Pterophyllum | I. | Hag fish |
B. | Myxine | II. | Saw fish |
C. | Pristis | III. | Angel fish |
D. | Exocoetus | IV. | Flying fish |
1. | A-III, B-I, C-II, D-IV |
2. | A-IV, B-I, C-II, D-III |
3. | A-III, B-II, C-I, D-IV |
4. | A-II, B-I, C-III, D-IV |
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. |
1. | A, B & D only |
2. | B, D & E only |
3. | B, C & D only |
4. | A & C only |
List-I | List-II | ||
A. | Chondrichthyes | I. | Clarias |
B. | Cyclostomata | II. | Carcharodon |
C. | Osteichthyes | III. | Myxine |
D. | Amphibia | IV. | Ichthyophis |
1. | A-II,B-IV,C-I,D-III |
2. | A-I,B-III,C-II,D-IV |
3. | A-II,B-III,C-I,D-IV |
4. | A-I,B-II,C-III,D-IV |
Assertion (A): | Members of subphylum vertebrate possess notochord during the embryonic period. The notochord is replaced by a cartilaginous or bony vertebral column in the adult. |
Reason (R): | All chordates are vertebrates but not all vertebrates are chordates |
1. | (A) is True but (R) is False |
2. | (A) is False but (R) is True |
3. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
4. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
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. |
Which one of the following features are not true for chordates?
(a) Heart is dorsal.
(b) Pharynx is perforated by gill slits.
(c) Central nervous system is ventral, solid and single.
(d) Post-anal tail is present.
(e) Notochord is present.
Choose the most appropriate answer from the option given below:
1. | (e) only | 2. | (a), (d) and (c) only |
3. | (b) and (c) only | 4. | (a) and (c) only |
Which of the following statements are true for the phylum-Chordata?
(a) | In Urochordata, notochord extends from head to tail and is present throughout their life |
(b) | In Vertebrata, notochord is present during the embryonic period only |
(c) | Central nervous system is dorsal and hollow |
(d) | Chordata is divided into 3 sub-phyla : Hemichordata, Tunicata and Cephalochordata |
1. (c) and (a)
2. (a) and (b)
3. (b) and (c)
4. (d) and (c)
All vertebrates are chordates but all chordates are not vertebrates, why?
1. | Notochord is replaced by a vertebral column in the adults of some chordates. |
2. | The ventral hollow nerve cord remains throughout life in some chordates. |
3. | All chordates possess a vertebral column. |
4. | All chordates possess notochords throughout their lives. |