When cells of nucellus in ovule make the embryo directly then it is ?

Options

A. Amphimictic
B. Parthenogenetic
C. Both 1 & 2
D. Apomictic

Answer

To solve the question "When cells of nucellus in ovule make the embryo directly then it is?", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Nucellus**: The nucellus is a tissue within the ovule that contains the female gametes (egg cells). It plays a crucial role in the development of the embryo.

2. **Embryo Formation**: In typical sexual reproduction, an embryo is formed when a sperm cell fertilizes an egg cell, resulting in a zygote. This process is known as syngamy.

3. **Apomixis Definition**: However, in some plants, embryos can develop without fertilization. This phenomenon is known as apomixis. In apomictic plants, the embryo can develop directly from the nucellus or other tissues without the fusion of gametes.

4. **Characteristics of Apomixis**: In apomictic reproduction, the cells of the nucellus can divide mitotically to form an embryo, which is genetically identical to the parent plant. This means that the embryo is diploid (2N) because it originates from diploid cells.

5. **Examples of Apomictic Plants**: Common examples of apomictic plants include mango and many citrus fruits. The embryos formed in this way are referred to as adventitious embryos.

6. **Conclusion**: Therefore, when cells of the nucellus in the ovule make the embryo directly, it is classified as apomictic.

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

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