Adventive embryony in Citrus is due to

Options

A. Nucellus
B. lnteguments
C. Zygotic embryo
D. Fertilized egg

Answer

**Step-by-Step Text Solution:**

1. **Understanding Adventive Embryony**: Adventive embryony refers to the formation of embryos from tissues other than the fertilized ovule, specifically from the nucellus in certain plants.

2. **Identifying the Nucellus**: The nucellus is a tissue that surrounds the embryo sac in the ovule. It plays a crucial role in the development of the seed.

3. **Function of the Nucellus**: The primary function of the nucellus is to provide nourishment to the developing embryo. It can also develop into a structure called perisperm.

4. **Understanding Perisperm**: Perisperm is a tissue that serves as a food reserve for the embryo, similar to endosperm in other plants. It is derived from the nucellus.

5. **Genetic Similarity**: In some plants, the embryos formed from the nucellus are genetically similar to the parent plant. This phenomenon is referred to as adventive embryony.

6. **Evaluating the Options**: The question provides four options:
- A) Nucellus
- B) Integuments
- C) Zygotic embryo
- D) Fertilized egg

Among these, the correct answer is A) Nucellus, as it is responsible for the adventive embryony in Citrus.

7. **Conclusion**: Therefore, the correct answer to the question is that adventive embryony in Citrus is due to the nucellus.