The flask-shaped organ X at the centre of a flower is surrounded by a number of little stalks Y having swollen tops which lie just inside the ring of petals.
What does the swollen top of organ Y contain ?

Answer

To answer the question about the flask-shaped organ X at the center of a flower and the swollen tops of the stalks Y surrounding it, we can break down the solution into the following steps:

### Step-by-Step Solution:

1. **Identify Organ X**:
- The organ X described as flask-shaped and located at the center of the flower is the pistil, which is the female reproductive part of the flower. The pistil consists of three main parts: the stigma, style, and ovary.

2. **Identify Organ Y**:
- The little stalks Y surrounding the pistil are the stamens, which are the male reproductive parts of the flower. Each stamen consists of a filament (the stalk) and an anther (the swollen top).

3. **Focus on the Swollen Tops of Organ Y**:
- The swollen tops of the stalks Y are specifically the anthers. The anther is the part of the stamen that produces pollen.

4. **Content of the Anther**:
- The swollen tops (anthers) contain pollen grains. Pollen grains are the male gametes of flowering plants and are essential for the process of reproduction.

5. **Conclusion**:
- Therefore, the swollen top of organ Y (the anther) contains pollen grains, which are crucial for fertilization in the reproductive process of plants.

### Final Answer:
The swollen top of organ Y contains pollen grains.