Which description of movement in phloem is correct?
1 )
Adding sucrose to a sieve tube element increases its water potential so that water enters and increases the hydrostatic pressure.
2 )
At a sink, such as a storage organ, sucrose is removed from a sieve tube element and polymerised into starch.
3 )
At a source, such as a photosynthesising leaf, sucrose enters a sieve tube element by facilitated diffusion.
At a source, sucrose is loaded into a companion cell using a protein that carries both hydrogen ions and sucrose molecules.
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