Step 1: Understanding the Concept:
A transgenic plant is a plant that has had its genome modified through genetic engineering to contain one or more foreign genes. Step 2: Detailed Explanation:
The first transgenic plant was created in 1983.
Scientists successfully developed an antibiotic-resistant tobacco plant.
They introduced a chimeric gene for kanamycin resistance into the plant cells using an Agrobacterium plasmid vector.
This breakthrough laid the foundation for modern plant biotechnology and genetically modified crops.
Therefore, the first transgenic plant developed was tobacco. Step 3: Final Answer
The correct option is (A).