The current theory to explain the movement of materials within the phloem of a living plant involves the following steps:
1 - HSC - SSCE Biology - Question 14 - 2014 - Paper 1
Question 14
The current theory to explain the movement of materials within the phloem of a living plant involves the following steps:
1. Osmosis
2. Active transport of sugars i... show full transcript
Worked Solution & Example Answer:The current theory to explain the movement of materials within the phloem of a living plant involves the following steps:
1 - HSC - SSCE Biology - Question 14 - 2014 - Paper 1
Step 1
Flow of sugar solution up and down
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Answer
In the phloem, after the sugars are actively transported from the photosynthetic cells, they dissolve in the solution and flow up and down the plant.
Step 2
Active transport of sugars from photosynthetic cells
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Answer
Sugars produced in the leaves (photosynthetic cells) are transported into the phloem through active transport, which requires energy.
Step 3
Osmosis
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Answer
This transportation leads to a higher concentration of sugars in the phloem compared to surrounding cells, causing water to enter the phloem by osmosis.
Step 4
Active transport of sugars into non-photosynthetic cells
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Answer
Finally, sugars are then actively transported into non-photosynthetic cells for use or storage, completing the cycle of sugar movement.
