MCQ
Non$-$symbiotic nitrogen fixing prokaryote is:
- ARhizobium
- BNostoc
- CFrankia
- ✓Azotobacter
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Here $A$ and $B$ refer to

$II.$ Differentiation
$III.$ Maturation
$IV.$ Senescence
Identify the correct sequence of the following events occurring in plants and choose the correct option accordingly