(a)[4]
Describe and explain how lignin and suberin help water transport through the roots and stem of a plant.
(b)
The enzyme laccase catalyses lignin formation in plants. Fig. 4.1 shows a diagram of the mode of action of laccase.
Biology 9700 · AS & A Level · Structure of transport tissues
Structure of transport tissues — practice question
Lignin and suberin are polymers found in plant tissues.
Worked solution & mark scheme
This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “suberin is hydrophobic and impermeable to water in the Casparian strip” …
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