Which statement correctly describes movement in phloem?
- AAdding sucrose to a sieve tube element increases its water potential so that water enters and increases the hydrostatic pressure.
- BAt a sink, such as a storage organ, sucrose is removed from a sieve tube element and polymerised into starch.
- CAt a source, such as a photosynthesising leaf, sucrose enters a sieve tube element by facilitated diffusion.
- DAt a source, sucrose is loaded into a companion cell using a protein that carries both hydrogen ions and sucrose molecules.