Aleurone layer is rich in:
(a) Proteins
(b) Starch
(c) Lipids
(d) Auxins

Options

A. Proteins
B. Starch
C. Lipids
D. Auxins

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks what the aleurone layer is rich in. The options provided are proteins, starch, lipids, and auxins.

2. **Identifying the Aleurone Layer**: The aleurone layer is a tissue found in the seeds of many plants, particularly in monocotyledons (monocots). It is located just beneath the seed coat and surrounds the endosperm.

3. **Composition of the Aleurone Layer**: The cells of the aleurone layer are primarily filled with proteinaceous particles. This means that the aleurone layer is rich in proteins.

4. **Function of the Aleurone Layer**: The proteins stored in the aleurone layer play a crucial role during seed germination. They provide the necessary nutrients for the developing plant.

5. **Evaluating the Options**:
- (a) Proteins: Correct, as the aleurone layer is rich in proteins.
- (b) Starch: Incorrect, as the aleurone layer is not primarily composed of starch.
- (c) Lipids: Incorrect, as the aleurone layer does not contain a significant amount of lipids.
- (d) Auxins: Incorrect, as auxins are plant hormones and not a major component of the aleurone layer.

6. **Conclusion**: Based on the information, the correct answer is (a) Proteins.

**Final Answer**: (a) Proteins

---