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Questions and Answers
What is the primary force that drives water up the xylem in plants?
What is the primary force that drives water up the xylem in plants?
What is the term for the movement of sugars and amino acids from leaves to roots and other parts of the plant?
What is the term for the movement of sugars and amino acids from leaves to roots and other parts of the plant?
What type of transport is used by cells to pump ions and molecules across cell membranes?
What type of transport is used by cells to pump ions and molecules across cell membranes?
What is the importance of transportation in plants in terms of responding to environmental changes?
What is the importance of transportation in plants in terms of responding to environmental changes?
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What is the name of the hypothesis that explains the transportation of phloem sap through the phloem?
What is the name of the hypothesis that explains the transportation of phloem sap through the phloem?
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Study Notes
Transportation in Plants
Types of Transportation
- Xylem transportation: water and minerals from roots to leaves
- Phloem transportation: sugars and amino acids from leaves to roots and other parts of the plant
Xylem Transportation
- Transpiration stream: water evaporates from leaves, creating a suction force that pulls water up the xylem
- Cohesion-tension theory: water molecules stick together, allowing them to be pulled up the xylem
- Root pressure: roots absorb water and exert pressure to push water up the xylem
Phloem Transportation
- Translocation: sugars and amino acids are transported from source (leaves) to sink (roots and other parts)
- Phloem sap: a mixture of sugars, amino acids, and other organic compounds
- Mass flow hypothesis: phloem sap is transported through the phloem under pressure, driven by osmotic pressure differences
Mechanisms of Transportation
- Active transport: cells use energy to pump ions and molecules across cell membranes
- Passive transport: molecules move down their concentration gradient through diffusion or osmosis
- Bulk flow: movement of fluid through the xylem and phloem under pressure
Importance of Transportation in Plants
- Supports photosynthesis: provides water and minerals necessary for photosynthesis
- Supports growth and development: provides sugars and amino acids necessary for growth and development
- Responds to environmental changes: plants adjust transportation to respond to changes in light, temperature, and water availability
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Description
Learn about the different types of transportation in plants, including xylem and phloem transportation, and their importance for plant growth and development.
