The diagram represents one current theory for the movement of materials in phloem - HSC - SSCE Biology - Question 11 - 2011 - Paper 1
Question 11
The diagram represents one current theory for the movement of materials in phloem.
In the process illustrated in the diagram, water from xylem
(A) causes a build u... show full transcript
Worked Solution & Example Answer:The diagram represents one current theory for the movement of materials in phloem - HSC - SSCE Biology - Question 11 - 2011 - Paper 1
Step 1
A) causes a build up of pressure.
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Answer
In the context of phloem transport, water from the xylem aids in creating pressure that facilitates the movement of sucrose and other materials through the phloem. This pressure is generated by osmotic flow and is essential for efficient material transport.
Step 2
B) allows adhesion for capillarity.
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Answer
While water indeed plays a role in adhesion and capillarity, this process is more relevant to xylem transport rather than the direct movement of materials within the phloem.
Step 3
C) provides water for photosynthesis.
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Answer
Although water is crucial for photosynthesis, the emphasis in this question is on the role of water in the movement of materials in phloem, rather than its role in photosynthesis itself.
Step 4
D) dilutes sucrose for active transport.
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Answer
This is the most accurate choice. Water from the xylem serves to dilute the sucrose concentration in the phloem, which is necessary for the process of active transport, allowing the movement of sucrose toward the sink.
