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 process where a diploid cell of an ovule outside the embryo sac develops into another embryo sac with reduction. Let's break it down step by step:

### Step 1: Understand the Terms
- **Diploid Cell**: A cell containing two complete sets of chromosomes, one from each parent.
- **Embryo Sac**: The female gametophyte in seed plants, which contains the egg cell and other cells involved in fertilization.
- **Reduction**: This typically refers to meiosis, where the chromosome number is halved.

### Step 2: Analyze the Options
1. **Parthenogenesis**: This is a form of asexual reproduction where an egg develops into an individual without fertilization. This does not involve the formation of an embryo sac from a diploid cell.

2. **Apospory**: This is a process where a diploid cell (2N) develops into a gametophyte (embryo sac) without meiosis. Apospory involves the formation of an embryo sac from a diploid cell outside the normal embryo sac, which matches the description in the question.

3. **Double Fertilization**: This occurs in angiosperms where one sperm fertilizes the egg, and another sperm fuses with two polar nuclei to form the endosperm. This does not relate to the formation of an embryo sac from a diploid cell.

4. **Endosperm Formation**: This is a process related to the development of the endosperm after fertilization and does not pertain to the formation of an embryo sac from a diploid cell.

### Step 3: Conclusion
Based on the analysis of the options, the correct answer to the question is **Apospory**. This process involves the development of an embryo sac from a diploid cell outside the embryo sac, which aligns with the description provided in the question.

### Final Answer
The process where the diploid cell of an ovule outside the embryo sac develops into another embryo sac with reduction is known as **Apospory**.

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