A) Mimosoideae
B) Caesalpinoideae
C) Papilionatae
D) Solanaceae
Correct Answer: C
Solution :
Plants belonging to sub-family papilionatae of family leguminosae (e.g., pea, gram etc.) bear nodule-like swellings, called root nodules. These nodules contain nitrogen fixing bacteria which fix atmospheric free nitrogen in to ammonia.
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