In citrus, a seed has 10 embryos. Out of 10 embryos

Options

A. One is normal and 9 are adventive, mostly nucellar embryos
B. One is adventive, mosltly nucellar and 9 are normal embryos
C. 5 are nucellar and 5 are normal embryos
D. One is normal and 9 are monozygotic embryos

Answer

### Step-by-Step Solution:

1. **Understanding the Context**: The question states that in citrus, a seed has 10 embryos. We need to analyze the characteristics of these embryos based on the statements provided.

2. **Identifying the Types of Embryos**: In citrus, there is typically one normal embryo that results from fertilization (the zygote), and the rest are advantageous embryos that develop from the new-seller tissue surrounding the embryo sac.

3. **Analyzing the Statements**:
- **Statement 1**: "One is normal and nine are advantageous, mostly new-seller embryos."
- This statement is correct. The normal embryo is the result of fertilization, while the other nine embryos are formed from the new-seller tissue.

- **Statement 2**: "One is advantageous, mostly new-seller and nine are normal embryos."
- This statement is incorrect. It incorrectly states that there are nine normal embryos, which contradicts the known formation process in citrus.

- **Statement 3**: "Five are new-seller and five are normal embryos."
- This statement is also incorrect. The ratio of embryos is not 50-50; there is one normal embryo and nine advantageous embryos.

- **Statement 4**: "One is normal and nine are mono-zygotic embryos."
- This statement is incorrect. Mono-zygotic embryos refer to embryos that develop from a single fertilized egg, which does not apply to the additional embryos formed from new-seller tissue.

4. **Conclusion**: Based on the analysis of the statements, the correct statement is the first one: "One is normal and nine are advantageous, mostly new-seller embryos."

### Final Answer:
The correct statement is: "One is normal and nine are advantageous, mostly new-seller embryos."

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