Which of the following statements explain why a stem is both cut and connected to a potometer under water?
1 To prevent plasmolysis of xylem vessel elements
2 To prevent the collapse of xylem vessel elements
3 To prevent air entering xylem vessel elements
1 )
1 only
3 only
3 )
2 and 3 only
4 )
1, 2 and 3
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