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Which of the following statements is true?
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- Vessels are multicellular with narrow lumen
- Tracheids are multicellular with narrow lumen
- Vessels are unicellular with wide lumen
- Tracheids are unicellular with wide lumen
Correct Option: D
Vessels are elongated, multicellular water conducting channels with wide lumen formed by end to end fusion of a large number of vessel elements. Tracheids are elongated dead cells with tapering ends having lignified walls and large or wide lumen. Their main function is conduction of water and minerals from root to leaf.