The question is asking for the component that is NOT a part of conducting tissue in plants. Conducting tissue refers to the specialized tissue in plants that is responsible for transporting water, nutrients, and other substances throughout the plant.

Option 1: Fibres - Fibres are not a component of conducting tissue in plants. Fibres are a type of sclerenchyma cells that provide structural support to the plant. They are not involved in the transport of substances.

Option 2: Tracheids - Tracheids are a type of cells present in the xylem tissue, which is a part of the conducting tissue in plants. Tracheids are responsible for transporting water and minerals upwards from the roots to other parts of the plant.

Option 3: Pericycle - Pericycle is not a component of conducting tissue in plants. Pericycle is a layer of cells that surrounds the vascular tissue, and it is involved in lateral root development.

Option 4: Sieve tubes - Sieve tubes are a type of cells present in the phloem tissue, which is another component of conducting tissue in plants. Sieve tubes are responsible for transporting sugars and other organic compounds from the leaves to the rest of the plant.

Therefore, option 3 (Pericycle