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In nodule formation, rhizobia first colonise and attach to:

ARoot cap cells
BRoot core cells
CRoot node cells
DRoot hair cells
Answer & Solution
Correct answer: D. Root hair cells
1. They multiply around the root first. 2. The root hairs then curl. 3. They attach to epidermal and root hair cells. _Source: syllabus Biology, Ch 12 'Mineral Nutrition'_
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