Cereals and millets are mainly deficient in which amino acids?

Options

A. Sulphur containing amino acid-methionine and crysteine
B. Lysine
C. Tryptophan
D. Both (2) & (3)

Answer

To answer the question regarding which amino acids cereals and millets are mainly deficient in, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks which amino acids are deficient in cereals and millets.

2. **Identifying Essential Amino Acids**: Essential amino acids are those that cannot be synthesized by the body and must be obtained from the diet.

3. **Recognizing the Nature of Cereals and Millets**: Cereals and millets are often referred to as "incomplete proteins." This means they do not provide all the essential amino acids in sufficient quantities.

4. **Identifying Deficient Amino Acids**:
- Cereals and millets are particularly low in lysine, which is one of the essential amino acids.
- They may also have deficiencies in threonine and tryptophan.

5. **Analyzing the Options**: The options provided include:
- Methionine and cysteine
- Lysine
- Tryptophan
- Both lysine and tryptophan

6. **Conclusion**: Based on the information, cereals and millets are mainly deficient in lysine, and they also have lower levels of threonine and tryptophan. Therefore, the correct answer is that they are deficient in both lysine and tryptophan.

### Final Answer:
Cereals and millets are mainly deficient in lysine and tryptophan.

---