Bast fibers are(a)Sclerenchyma fibres(b)Phloem fibres(c)Libriform fibres(d)Fibres tracheids

Bast fibers are phloem fibers.

Phloem fibers are long, slender cells that provide mechanical support to the plant and are found in the phloem tissue, which is responsible for transporting nutrients and sugars throughout the plant. Bast fibers are derived from the secondary phloem of various plants and are commonly used in the textile industry due to their strength and durability.

Sclerenchyma fibers are another type of plant fiber, but they are different from bast fibers. Sclerenchyma fibers provide structural support and are found in various parts of the plant, including stems, leaves, and roots. They are characterized by thick cell walls and a rigid structure.

Libriform fibers, also known as wood fibers, are another type of plant fiber that are found in the xylem tissue of woody plants. They play a role in water conduction and mechanical support.

Fiber tracheids, on the other hand, are not specifically associated with bast fibers. Tracheids are a type of xylem cell that is involved in water conduction and support in plants. They are characterized by tapering ends and overlapping cell walls.