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Sieve tubes are suited for translocation of food because they possess

1. bordered pits
2. no end walls
3. broader lumen and perforated cross walls
4. no protoplasm

Correct answer: broader lumen and perforated cross walls

Solution

Sieve tubes transport sugars efficiently because their cells form long conducting channels with a broad lumen, and the sieve plates (perforated cross walls) allow sap to pass from one element to the next. This structure minimizes obstruction and supports mass flow of food.

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