Phloem Tissue Components Explained

Phloem tissue is one of the two types of transport tissue in vascular plants, distinguished from xylem. It transports sugars produced during photosynthesis from the leaves to other parts of the plant.

Key Components of Phloem

The main components that make up phloem tissue include:

• Sieve elements (sieve cells and sieve-tube elements): Responsible for conduction.
• Companion cells: Provide metabolic support to sieve elements.
• Phloem parenchyma: Involved in storage and loading/unloading of sugars.
• Phloem fibres: Provide structural support.

Analyzing the Options

Evaluating the provided options to identify a phloem component:

• Sieve tubes: These are formed by sieve-tube elements and are the primary conducting structures in the phloem. This is a correct component of phloem.
• Tracheids: These are elongated cells that are part of the xylem, aiding in water transport.
• Xylem fibres: These provide structural support to the xylem tissue.
• Vessels: These form continuous tubes within the xylem for efficient water transport.

Therefore, sieve tubes are a component of phloem tissue.