In which of the following plant the number of ovules in an ovary is one ?

Options

A. mango
B. orchids
C. water melon
D. papaya

Answer

To determine which plant has only one ovule in its ovary, we can analyze the options provided based on their botanical classifications.

### Step-by-Step Solution:

1. **Understanding the Terms**:
- An ovary with one ovule is referred to as monocarpillary.
- An ovary with multiple ovules is referred to as multicarpillary.

2. **Analyzing Each Option**:
- **Mango**:
- Belongs to the family Anacardiaceae.
- It is known to have a monocarpillary ovary, meaning it has only one ovule.
- **Orchids**:
- Belong to the family Orchidaceae.
- They typically have a multicarpillary ovary, which means they have multiple ovules.
- **Watermelon**:
- Belongs to the family Cucurbitaceae.
- It also has a multicarpillary ovary with many ovules.
- **Papaya**:
- Belongs to the family Caricaceae.
- Like the others, it has a multicarpillary ovary with multiple ovules.

3. **Conclusion**:
- Among the options, only the mango has a single ovule in its ovary, making it the correct answer.

### Final Answer:
The plant in which the number of ovules in an ovary is one is **Mango**.