Which of the following structures do not represent sporophytic generation in flowering plants ?

Options

A. Stigma and style
B. Ovary and nucellus
C. Megaspore and microspore
D. Megaspore mother cell and integument

Answer

To solve the question "Which of the following structures do not represent sporophytic generation in flowering plants?", we will analyze each option step by step.

### Step-by-Step Solution:

1. **Understanding Generations**:
- Flowering plants (angiosperms) exhibit two generations: the sporophytic generation (diploid) and the gametophytic generation (haploid).
- The sporophyte is the dominant generation in flowering plants, producing spores through meiosis.

2. **Analyzing Each Option**:
- **Option 1: Stigma and Style**:
- Both stigma and style are parts of the flower and are diploid structures. They belong to the sporophytic generation.

- **Option 2: Ovary and Nucellus**:
- The ovary is part of the flower and contains the nucellus, both of which are diploid. Thus, they also represent the sporophytic generation.

- **Option 3: Megaspore and Microspore**:
- Megaspores and microspores are produced from the sporophyte through meiosis. However, they are haploid and represent the gametophytic generation, not the sporophytic generation.

- **Option 4: Megaspore Mother Cells and Integument**:
- Megaspore mother cells (megaspore mother cells are diploid) and integument (which is also diploid) are part of the ovule and represent the sporophytic generation.

3. **Conclusion**:
- The only option that does not represent the sporophytic generation is **Option 3: Megaspore and Microspore**.

### Final Answer:
**Option 3: Megaspore and Microspore** do not represent sporophytic generation in flowering plants.