Ovules are not found enclosed in ovary in :
(a) gymnosperms
(b) spermatophytes
(c) dicotyledons
(d) monocotyledons

Options

A. gymnosperms
B. spermatophytes
C. dicotyledons
D. monocotyledons

Explanation

To solve the question, "Ovules are not found enclosed in ovary in:", we need to analyze each option provided.

### Step-by-Step Solution:

1. **Understanding the Terms**:
- **Ovules**: These are the structures in seed plants that develop into seeds after fertilization.
- **Ovary**: This is the part of the flower that contains ovules. In angiosperms (flowering plants), ovules are enclosed within the ovary.

2. **Evaluating Each Option**:
- **(a) Gymnosperms**: Gymnosperms are a group of seed-bearing plants that do not form flowers or fruits. The ovules in gymnosperms are not enclosed in an ovary; they are exposed on the surface of cones (e.g., conifers). Thus, gymnosperms have "naked ovules."

- **(b) Spermatophytes**: This term refers to seed-producing plants, which include both gymnosperms and angiosperms. Since gymnosperms are included in this group, this option is too broad and does not specifically answer the question.

- **(c) Dicotyledons**: Dicotyledons (or dicots) are a group of angiosperms where the ovules are enclosed within the ovary. Therefore, this option does not fit the criteria of the question.

- **(d) Monocotyledons**: Similar to dicots, monocots are also angiosperms, and their ovules are also enclosed within the ovary. Thus, this option is also incorrect.

3. **Conclusion**: Based on the analysis, the correct answer is **(a) gymnosperms**, as they are the only group listed where ovules are not enclosed in an ovary.

### Final Answer:
**(a) gymnosperms**