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Which one of the following is commonly used in transfer of foreign DNA into crop plants?

1. Meloidogyne incognita
2. Agrobacterium tumefaciens
3. Penicillium expansum
4. Trichoderma harzianum

Correct answer: Agrobacterium tumefaciens

Solution

Agrobacterium tumefaciens naturally transfers a segment of its Ti plasmid DNA into plant cells, which scientists exploit to create transgenic crops. The other options are fungi or a nematode and are not standard vectors for plant DNA transfer.

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