A) Presence of coelom
B) Pharyngeal gill clefts in the early embryonic stages
C) A diaphragm that separates thorax from abdomen
D) Dorsal nerve cord
Correct Answer: A
Solution :
[a] Main characteristics of phylum Chordata are as follows: |
1. Bilateral symmetry; segmented body; three germ layers; well-developed coelom. |
2. Notochord (a skeletal rod) present at some stage in the life cycle. |
3. Single, dorsal, tubular nerve cord; anterior end of cord usually enlarged to form brain. |
4. Pharyngeal pouches present at some stage in the life cycle; in aquatic chordates these develop into gill slits. |
5. Postanal tail, usually projecting beyond the anus at some stage but may or may not persist. |
6. Segmented muscles in an unsegmented trunk. |
7. Ventral heart, with dorsal and ventral blood vessel; closed blood system. |
8. Complete digestive system. |
9. A cartilaginous or bony endoskeleton present in the majority of members (vertebrates). |
10. Presence of diaphragm is the characteristic feature of vertebrates e, g., Mammals. |
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