Which descriptions of the adaptations of xylem vessel elements to their function are correct?
1) They have pits between vessels allowing water to pass from one vessel to another.
2) They are thickened with lignin to stop them collapsing when the column of water is under tension.
3) They form a continuous hollow tube through the plant providing little resistance to water movement.
1, 2 and 3
2 )
1 and 3 only
3 )
2 only
4 )
2 and 3 only
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