Biology 9700 · AS & A Level · Transport mechanisms
Transport mechanisms — practice question
In flowering plants, assimilates are transported through phloem tissue from sources to sinks.
(a(i))[2]
Explain why a root can function as both a source and a sink.
(a(ii))[1]
State two examples of assimilates that are moved in the phloem.
(b)[4]
Describe and explain the mechanism responsible for the movement of phloem sap in sieve tubes.
(c)[3]
Compare the results for varieties $V1$ and $V2$ with those of the control plants, $C$.
Worked solution & mark scheme
This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Assimilates include sucrose, amino acids, monosaccharides, disaccharides or hormones.” …