Different substances, such as sucrose and amino acids, can move in different directions in the phloem sieve tube elements.
Which statement explains this?
1 )
Active transport occurs in some phloem sieve tube elements and mass flow occurs in other sieve tube elements.
2 )
Both active transport and mass flow occur in each individual phloem sieve tube element.
3 )
Mass flow occurs in both directions at the same time in each individual phloem sieve tube element.
Mass flow occurs in different directions in different phloem sieve tube elements at the same time.
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