MCQ
Closed vascular bundles lacks.
- APith
- BXylem
- ✓Cambium
- DXylem vessels

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$(I)$. Open $N a^{+i i}$ channel
$(II)$. Closed $N a^{+i i}$ channel
$(III)$. Closed $K^{+i i}$ channel
$(IV)$. Open $K^{+i i}$ channel