Sieve tubes are better suited for translocation, because
(a) Possess a broader lumen and perforted cross walls
(b) Are broader than longer
(c) Possess bordered pits
(d) Possess no end walls

Options

A. Possess a broader lumen and perforted cross walls
B. Are broader than longer
C. Possess bordered pits
D. Possess no end walls

Answer

To determine why sieve tubes are better suited for translocation, we need to analyze the options provided in the question:

1. **Understanding Sieve Tubes**: Sieve tubes are part of the phloem tissue in plants, which is responsible for the transport of nutrients, particularly sugars like sucrose, from the leaves (source) to other parts of the plant (sink).

2. **Analyzing the Options**:
- **(a) Possess a broader lumen and perforated cross walls**: Sieve tubes have a wider lumen that allows for easier flow of substances. The perforated cross walls (sieve plates) facilitate the movement of sap between adjacent sieve tube elements, making translocation efficient.
- **(b) Are broader than longer**: While sieve tubes are elongated, their primary function is not defined by their width compared to their length.
- **(c) Possess bordered pits**: Bordered pits are found in xylem vessels, not sieve tubes, and are not relevant to the translocation process in phloem.
- **(d) Possess no end walls**: Sieve tubes do have end walls, but these walls are perforated to allow for the flow of sap. Thus, this statement is misleading.

3. **Conclusion**: The best option that explains why sieve tubes are suited for translocation is **(a) possess a broader lumen and perforated cross walls**. This structural adaptation allows for efficient transport of nutrients throughout the plant.

### Final Answer:
Sieve tubes are better suited for translocation because they possess a broader lumen and perforated cross walls (Option A).