A) anterior centrum is convex
B) anterior centrum is concave
C) anterior centrum is saddle shaped
D) posterior centrum is concave
Correct Answer: B
Solution :
On the basis of centrum venebrae may be of following type : (i) Procoelus-vertebrae : Cavity is present on anterior side of centrum e.g., Amphibia. (ii) Acoelus : No cavity in centrum also known as amphiplatyon e.g., Mammals. (iii) Hetrocoelus vertebrae : SADDLE shaped vertebrae e.g.. Birds. (i)Ophisthocoelus vertebrae : (ii)Cavity present on posterior side of centrum e.g., Fishes and snakes.
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