A process where the diploid cell of an ovule outside the embryo sac developing into another embryo sac with reduction is known as

Options

A. Parthenogenesis
B. Apospory
C. Double fertilization
D. Endosperm formation

Answer

To solve the question, we need to identify the correct term that describes the process where a diploid cell of an ovule outside the embryo sac develops into another embryo sac with reduction.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for a specific biological process involving a diploid cell of an ovule that develops into another embryo sac. This process must also involve reduction, which typically refers to the reduction of chromosome number.

2. **Analyzing the Options**:
- **Option 1: Parthenogenesis**: This is a type of asexual reproduction where an egg develops into an organism without fertilization. Since the question specifies the involvement of a diploid cell in an ovule, this option is incorrect.

- **Option 2: Apospory**: Apospory is the process where a diploid gametophyte (2N) forms directly from the sporophyte without meiosis. This means that the diploid cell of the ovule can develop into another embryo sac, which aligns with the question. This option is correct.

- **Option 3: Double Fertilization**: This process involves the fertilization of two different nuclei, leading to the formation of both the embryo and the endosperm. However, it does not describe the development of a diploid cell into an embryo sac, making this option incorrect.

- **Option 4: Endosperm Formation**: Endosperm is typically triploid and results from the fertilization of one sperm cell with two polar nuclei. This does not relate to the development of an embryo sac from a diploid cell, so this option is also incorrect.

3. **Conclusion**: After analyzing all the options, the correct answer is **Apospory** (Option 2), as it describes the process where a diploid cell of an ovule develops into another embryo sac with reduction.

### Final Answer:
The correct answer is **Apospory**.