Amino acids present in improved varieties of maize are

Options

A. methionine and alanine
B. alanine and cysteine
C. methionine and cysteine
D. Lysine and tryptophan

Answer

To answer the question about the amino acids present in improved varieties of maize, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Biofortification**:
- Biofortification refers to the process of enhancing the nutritional quality of food crops through conventional plant breeding or modern biotechnology. This process aims to improve the quantity and quality of essential nutrients in crops.

2. **Identifying the Normal Variety of Maize**:
- The normal or traditional varieties of maize typically have lower levels of certain essential amino acids.

3. **Recognizing the Improved Varieties**:
- Improved varieties of maize have been developed to enhance their nutritional content. Specifically, these varieties have been bred to increase the levels of certain amino acids.

4. **Key Amino Acids in Improved Maize**:
- The two primary amino acids that have been significantly increased in the improved varieties of maize are **lysine** and **tryptophan**.
- These amino acids are essential for human nutrition and are often deficient in many cereal grains.

5. **Examples of Improved Varieties**:
- Some of the improved varieties of maize that have higher levels of lysine and tryptophan include **Shakti**, **Ratan**, and **Protina**.

6. **Conclusion**:
- Therefore, the amino acids present in improved varieties of maize are **lysine** and **tryptophan**.

### Final Answer:
The amino acids present in improved varieties of maize are **lysine** and **tryptophan**.

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