What is the yellow dust present in the middle of a flower called?

Pollen 

The correct answer is Option (2) - Pollen

The yellow dust present in the middle of a flower is called: Pollen

Pollen is a powdery substance produced by the male reproductive organs (anthers) of flowering plants. It contains the male gametes (sperm cells) of the plant and is responsible for fertilizing the female reproductive organs (ovules) of the same or another flower, leading to the formation of seeds. Pollen grains are often visible as yellow or orange dust-like structures found in the center of flowers. They are typically dispersed by wind, insects, birds, or other pollinators to facilitate the pollination process.