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The most thoroughly studied fact of the known bacteria-plant interactions is the

1. cyanobacterial symbiosis with some aquatic ferns
2. gall formation on certain angiosperms by Agrobacterium
3. nodulation of Sesbania stems by nitrogen fixing bacteria
4. plant growth stimulation by phosphate-solubilising bacteria

Correct answer: gall formation on certain angiosperms by Agrobacterium

Solution

Agrobacterium-induced gall formation is the best-studied bacteria-plant interaction because it is a classic model for how bacteria transfer DNA into plant cells and alter growth. This has been investigated extensively in plant pathology and biotechnology.

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