Correct Option
Bt brinjal is a genetically engineered variety of brinjal that incorporates the `cry1Ac` gene. This gene is derived from the soil bacterium `Bacillus thuringiensis` (Bt). The `cry1Ac` gene produces a specific Cry protein which is toxic to certain insect pests, most notably the Brinjal Fruit and Shoot Borer (`Leucinodes orbonalis`), a major pest affecting brinjal crops. The primary objective of developing Bt brinjal is to confer intrinsic resistance against these insect pests, thereby reducing the reliance on chemical pesticides and potentially enhancing crop productivity.
Incorrect Options
Option 2 is incorrect. The genetic modification in Bt brinjal is specifically targeted at pest resistance and does not aim to improve its taste or nutritive qualities. These traits are governed by different genetic mechanisms.
Option 3 is incorrect. Drought resistance is a complex plant trait involving genes that enable the plant to tolerate water stress. The `cry1Ac` gene, which provides insect resistance, does not confer drought tolerance.
Option 4 is incorrect. The Bt technology in brinjal is designed to provide resistance against insect pests. It does not influence the post-harvest characteristics or extend the shelf-life of the brinjal fruit.