What is correct for phloem sieve tube elements?
1 )
Companion cells provide structural support to the phloem sieve tube elements.
2 )
Lignified walls of phloem sieve tube elements prevent transport of mineral salts by mass flow.
3 )
Phloem sieve tube elements become narrower as movement of sucrose occurs.
Plasmodesmata allow movement of water and solutes across cell walls of phloem sieve tube elements.
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