Which statement about the transport of sucrose is correct?
1 )
ATP synthesised by mitochondria of companion cells provides the energy to move sucrose from phloem sieve tube elements in leaves to sinks.
2 )
Sucrose moves through plasmodesmata by passive diffusion from mesophyll cells through companion cells to phloem sieve tube elements.
The water potential in phloem sieve tube elements becomes more negative following the entry of sucrose.
4 )
Water enters companion cells and hydrostatic pressure builds up to push sucrose into phloem sieve tube elements by mass flow.
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