Multiple Choice
In order to be transported throughout a plant, viruses exploit __________.
34. Vascular Plant Transport
Water Potential
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When referring to phloem transport, what creates the sink in roots?
A
The active transport of mineral ions into xylem cells
B
The osmosis of water into xylem cells
C
The absorption of water from the soil through epidermal cells
D
All of the listed responses are correct.
E
The active transport of sugars from phloem to cortex cells
Verified step by step guidance1
Understand the concept of phloem transport: Phloem is responsible for transporting sugars (primarily sucrose) and other organic nutrients throughout the plant. This process is known as translocation.
Identify the source and sink: In phloem transport, the 'source' is where sugars are produced (e.g., leaves during photosynthesis), and the 'sink' is where sugars are used or stored (e.g., roots, fruits, seeds).
Recognize the role of active transport: The sink is created by the active transport of sugars from the phloem into the surrounding cells, such as cortex cells in the roots. This process requires energy in the form of ATP.
Understand the movement of water: As sugars are actively transported into the sink cells, water follows by osmosis due to the increased solute concentration in these cells, maintaining the flow of phloem sap.
Clarify the incorrect options: The active transport of mineral ions and osmosis of water into xylem cells are related to xylem transport, not phloem. The absorption of water from the soil is a separate process involving root hairs and is not directly related to creating a sink in phloem transport.
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