| Pair of skeletal parts | Category | |
|---|---|---|
| (a)$\,\,$ | Sternum and ribs$\,\,$ | Axial skeleton |
| (b)$\,\,$ | Clavicle and glenoid cavity$\,\,$ | Pelvic girdle |
| (c)$\,\,$ | Flumerus and ulna$\,\,$ | Appendicular skeleton |
| (d)$\,\,$ | Malleus and stapes$\,\,$ | Ear ossicles |
| Genus name | Characters | Phylum | |
|---|---|---|---|
| (a) | Pila | (i) Body segmented (ii) Mouth with radula |
Mollusca |
| (b) | Asterias | (i) Spiny skinned (ii) Water vascularsystem |
Echinodermata |
| (c) | Sycon | (i) Pore bearing (ii) Canal system |
Porifera |
| (d) | Periplaneta | (i) Jointed appendages (ii) Chitinous exoskeleton |
Arthropoda |
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): All vertebrates are chordates but all chordates are not vertebrates
Reason (R): Notochord is replaced by the vertebral column in the adult vertebrates.
In the light of the above statements, choose the most appropriate answer from the options given below: