A transgenic food crop which may help in solving the problem of night blindness in developing countries is

Options

A. Bt cotton
B. golden rice
C. Flavr
D. Bt corn

Answer

**Step-by-Step Solution:**

1. **Understanding Night Blindness**: Night blindness is primarily caused by a deficiency of vitamin A, which is essential for maintaining healthy vision, particularly in low-light conditions.

2. **Identifying the Solution**: To address the issue of night blindness, especially in developing countries where vitamin A deficiency is prevalent, a transgenic food crop that can provide a source of vitamin A is needed.

3. **Introducing Golden Rice**: Golden rice is a genetically modified variety of rice that has been engineered to produce beta-carotene, which is a precursor to vitamin A. This means that when consumed, the body can convert beta-carotene into vitamin A.

4. **Genetic Modification Process**: The development of golden rice involved inserting two genes from the daffodil plant and one gene from a bacterial species into the rice genome. This genetic modification allows the rice plant to synthesize beta-carotene.

5. **Significance of Golden Rice**: Since rice is a staple food in many developing countries, particularly in Asia, the introduction of golden rice can significantly help in alleviating vitamin A deficiency and, consequently, reduce the incidence of night blindness.

6. **Conclusion**: Therefore, the transgenic food crop that may help in solving the problem of night blindness in developing countries is **Golden Rice**.

---