A simple one-seeded , dry , indehiscent fruit in which pericarp and testa are fused is

Options

A. Nut
B. Achene
C. Cypsela
D. Caryopsis

Answer

To solve the question "A simple one-seeded, dry, indehiscent fruit in which pericarp and testa are fused is," we need to analyze the options provided and determine which one fits the description given.

### Step-by-Step Solution:

1. **Understanding the Terms**:
- **Simple fruit**: A fruit that develops from a single ovary.
- **One-seeded**: The fruit contains only one seed.
- **Dry**: The fruit does not have a fleshy pericarp.
- **Indehiscent**: The fruit does not split open at maturity to release seeds.
- **Pericarp and testa are fused**: The outer layer of the fruit (pericarp) is fused with the seed coat (testa).

2. **Analyzing the Options**:
- **Option 1: Nut**:
- A nut is a hard, indehiscent fruit, but it usually contains more than one seed and does not have the pericarp fused with the testa. Therefore, this option is incorrect.

- **Option 2: Achene**:
- An achene is a small, indehiscent fruit with one seed, but the pericarp and testa are not fused. Thus, this option is also incorrect.

- **Option 3: Capsule**:
- A capsule is a dry fruit that splits open when mature (dehiscent) and usually contains multiple seeds. Therefore, this option is incorrect.

- **Option 4: Caryopsis**:
- A caryopsis is a type of dry, indehiscent fruit that contains one seed, where the pericarp and testa are fused together. This matches the description given in the question.

3. **Conclusion**:
- The correct answer is **Caryopsis**.

### Final Answer:
The simple one-seeded, dry, indehiscent fruit in which pericarp and testa are fused is **Caryopsis**.