It is a process of embryosac formation from cell of nucellus, without undergoing meiosis ?

Options

A. Polyembryony
B. Incompatibility
C. Parthenocarpy
D. Parthenogenesis

Explanation

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for a process where an embryo sac is formed from the cells of the nucellus without undergoing meiosis. This indicates that we are looking for a type of embryonic development that does not involve the typical reduction division.

2. **Identifying Key Terms**: The key terms in the question are "embryo sac," "nucellus," and "without undergoing meiosis." The nucellus is a tissue within the ovule that contains the embryo sac.

3. **Exploring Relevant Processes**: In plant reproduction, there are several processes related to embryo formation:
- **Polyembryony**: This is the occurrence of multiple embryos from a single fertilized egg.
- **Adventive Embryony**: This is a specific type of polyembryony where embryos develop from cells other than the egg cell, such as nucellar cells, without meiosis.

4. **Conclusion**: The process described in the question is known as **Adventive Embryony** or **Sporophytic Budding**. This occurs when a diploid cell from the nucellus develops directly into an embryo sac without undergoing meiosis.

5. **Final Answer**: The correct answer to the question is **Adventive Embryony**.