- ABirds.
- BReptiles.
- CMammals.
- DAmphibians.
Explanation:
Inter vertebral disc is found in the vertebral column of mammals. These are present between the bodies of adjacent vertebrae from second cervical vertebra to the sacrum. Each disc consists of an outer fibrous ring made of fibro cartilage and an inner soft pulpy, highly elastic substance. This disc-are majorly involved in formation of strong joints that permits various movements of the vertebral column and absorb vertical shocks.

Inter vertebral disc is not found in the vertebral column of birds reptiles or amphibians.
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Statement $I$: In $\mathrm{C}_3$ plants, some $\mathrm{O}_2$ binds to $\mathrm{RuBisCO}$, hence $\mathrm{CO}_2$ fixation is decreased.
Statement $II$: In $\mathrm{C}_4$ plants, mesophyll cells show very little photorespiration while bundle sheath cells do not show photorespiration.
In the light of the above statements, choose the correct answer from the options given below: