MCQ
Human eyeball consists of three layers and it encloses:
- ALens, iris, optic nerve.
- ✓Lens, acquous humor and vitreous humor.
- CCornea, lens, iris.
- DCornea, lens, optic nerve.

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$(A)$ $(B)$
$X$ in the given statement refers to
Statement $I$:The primary $CO _{2}$ acceptor in $C _{4}$ plants is phosphoenolpyruvate and is found in the mesophyll cells.
Statement $II:$Mesophyll cells of $C _{4}$ plants lack RuBisCo enzyme.
In the light of the above statements, choose the correct answer from the options given below: