evidence for movement of ions in the xylem Flashcards
(6 cards)
1
Q
What is used as tracers to provide evidence that ion transport happens in the xylem?
A
Radioactive tracers
2
Q
What is used to separate the xylem and phloem?
A
A wax cylinder
This prevents lateral (sideways) transport.
3
Q
What are the roots of the plants supplied with?
A
Radioactively labelled potassium ions (42 K)
4
Q
What happens after the radioactive substance has been in the plant for a few hours?
A
The amount of radioactivity is measured in the xylem and the phloem.
5
Q
What are the results in the xylem?
A
The radioactivity is larger indicating the transport of ions occurs in the tissue.
6
Q
What are the results in the phloem?
A
Small amount of radioactivity because of the lateral transport from the xylem where wax cylinder isn’t present.
