Introduction
The genetically engineered form of brinjal, known as Bt-brinjal, has been developed with the objective of making it pest-resistant. This genetic modification involves the introduction of a gene from the soil bacterium Bacillus thuringiensis (Bt) into the brinjal plant. Bt produces a protein that is toxic to certain insect pests, providing the plant with built-in resistance against these pests.

Explanation
1. Pest resistance: The main objective of developing Bt-brinjal is to make it pest-resistant. This is achieved by inserting the Bt gene, which produces a protein toxic to certain insect pests. When these pests feed on the Bt-brinjal, they ingest the toxic protein, leading to their death. This helps in reducing the damage caused by pests and the need for chemical pesticides, thereby improving the overall yield and quality of the brinjal crop.

2. Benefits over chemical pesticides: Bt-brinjal offers several advantages over conventional brinjal varieties that rely on chemical pesticides for pest control. The use of chemical pesticides not only adds to production costs but also poses health risks to farmers and consumers. Bt-brinjal, on the other hand, reduces the need for chemical pesticides, making it a more environmentally friendly and sustainable option.

3. Improved crop yield: By incorporating pest resistance into the brinjal plant, Bt-brinjal helps to minimize yield losses caused by insect pests. Pests such as the fruit and shoot borer, which are major threats to brinjal crops, can cause significant damage and reduce yields. With Bt-brinjal, farmers can expect higher yields and better quality produce, leading to increased profits.

4. Reduced production costs: The use of chemical pesticides can be expensive for farmers, as they need to be applied multiple times during the growing season. Bt-brinjal reduces the reliance on chemical pesticides, resulting in lower production costs for farmers. This makes Bt-brinjal a more economically viable option for farmers, especially those with limited resources.

5. Health and environmental benefits: The use of chemical pesticides not only poses health risks to farmers but also has adverse effects on the environment. These pesticides can contaminate soil, water, and air, leading to ecological imbalances and harm to non-target organisms. By reducing the need for chemical pesticides, Bt-brinjal helps to minimize these risks and promotes a safer and healthier agricultural system.

Conclusion
The development of Bt-brinjal with pest-resistant traits has significant implications for improving crop yield, reducing production costs, and promoting sustainable agriculture. By harnessing the power of genetic engineering, Bt-brinjal offers a promising solution to the challenges posed by insect pests in brinjal cultivation.