Inferior achenial one chambered and one seeded fruit derived from bicarpellary pistil with pericarp and seed-coat free. Which of the following fruit belongs to this category of fruits ?

Options

A. Wheat
B. Mustard
C. Pea
D. Sunflower

Answer

To solve the question regarding the type of fruit that is an inferior achene, one-chambered, and one-seeded, derived from a bicarpellary pistil with a pericarp and seed-coat free, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definitions**:
- **Achene**: A type of dry fruit that is usually one-seeded and does not open to release the seed.
- **Inferior Ovary**: An ovary that is located below the attachment of the other floral parts.
- **Bicarpellary Pistil**: A pistil composed of two carpels.

2. **Identify the Characteristics**:
- The fruit is described as inferior, meaning it develops from an inferior ovary.
- It is one-chambered (unilocular) and one-seeded (uni-ovuled).
- The pericarp (the fruit wall) and seed coat are free, indicating that they are not fused together.

3. **Evaluate the Options**:
- **Wheat**: Produces a karyopsis, which is a type of fruit where the pericarp is fused with the seed coat. This does not fit the criteria.
- **Mustard**: Produces a siliqua, which develops from a superior ovary and has a false septum. This also does not fit.
- **Pea**: Produces legumes or pods, which develop from a superior ovary. This does not fit the criteria either.
- **Sunflower**: Produces a type of achene from an inferior ovary, which is one-chambered and one-seeded, with the pericarp and seed coat being free.

4. **Conclusion**:
- Based on the analysis, the correct answer is **Sunflower** (option D), as it meets all the specified characteristics of the fruit described in the question.

### Final Answer:
The fruit that belongs to the category of inferior achenial, one-chambered, and one-seeded fruit derived from a bicarpellary pistil with pericarp and seed-coat free is **Sunflower**.