Transport proteins move sugar molecules into cells.
(a)[2]
Explain why transport proteins are needed to move sugar molecules, such as glucose and fructose, into cells.
(b)[5]
Using the information in Fig. 5.1, explain how sucrose:
• enters the companion cell
• passes from the companion cell into the sieve tube element.
(c)[1]
Sucrose is transported through phloem sieve tubes to sinks.
State two examples of sinks.
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