............. of plant flowers are the best material to study meiosis.

Explanation

**Step-by-Step Solution:**

1. **Understanding Meiosis**: Meiosis is a type of cell division that reduces the chromosome number by half, resulting in the formation of gametes (sex cells). This process is crucial for sexual reproduction.

2. **Identifying the Plant Structure**: In flowering plants, the structure that is involved in the production of male gametes is the anther, which is part of the stamen (the male reproductive organ of the flower).

3. **Function of the Anther**: The anther contains pollen grains, which are produced from the male sporogenous cells through the process of meiosis. Each pollen grain represents a male gamete.

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