Apomictic embryo of viable and diploid nature is developed by

Options

A. Apogamy
B. Non-recurrent agamospermy
C. Adventive embryony
D. Trophomixis

Answer

To answer the question regarding how an apomictic embryo of viable and diploid nature is developed, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Apomixis**:
- Apomixis is a form of asexual reproduction that occurs in flowering plants, where seeds are produced without fertilization. This means that the embryo develops directly from the maternal tissues of the ovule.

2. **Definition of Apomictic Embryo**:
- An apomictic embryo is formed from the maternal ovule without the involvement of male and female gametes. This embryo is typically diploid and viable, meaning it can develop into a mature plant.

3. **Types of Apomictic Embryos**:
- There are several mechanisms through which apomictic embryos can form, including:
- **Apogamy**: This involves the development of an embryo from a vegetative cell without fertilization. However, this does not lead to a viable diploid embryo.
- **Non-recurrent Agamospermia**: In this process, the microspore mother cell undergoes meiosis to form a haploid embryo sac, which results in sterile embryos. This is not applicable for viable diploid embryos.
- **Adventive Embryony**: This is the correct mechanism where embryos are formed without fertilization, and they are viable and diploid. This is the primary method through which apomictic embryos of viable and diploid nature are developed.

4. **Exclusion of Other Options**:
- **Trophomyxis**: This refers to the process of double fertilization, which is not related to the formation of apomictic embryos.

5. **Conclusion**:
- The correct answer to the question is that an apomictic embryo of viable and diploid nature is developed through **Adventive Embryony**.

### Final Answer:
An apomictic embryo of viable and diploid nature is developed by **Adventive Embryony**.