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What is the primary function of roots in the process of plant transport?
What is the primary function of roots in the process of plant transport?
- To transport sugars produced by photosynthesis
- To exchange gases with the air spaces of soil
- To absorb water and dissolved minerals from the soil (correct)
- To regulate the loss of water from leaves through stomata
What is the role of O2 in the process of cellular respiration in plant roots?
What is the role of O2 in the process of cellular respiration in plant roots?
- It is used to synthesize ATP
- It is involved in the transport of water and minerals
- It supports the breakdown of sugars (correct)
- It is produced as a byproduct of photosynthesis
What is the direction of water transport in xylem sap?
What is the direction of water transport in xylem sap?
- From shoots to roots
- From roots to shoots (correct)
- From roots to leaves
- From leaves to roots
What is the role of stomata in the process of plant transport?
What is the role of stomata in the process of plant transport?
What is the source of carbon for photosynthesis in plants?
What is the source of carbon for photosynthesis in plants?
What is the result of transpiration in plants?
What is the result of transpiration in plants?
What is the primary function of xylem vessels in a plant?
What is the primary function of xylem vessels in a plant?
What is the process by which water and minerals are absorbed from the soil into the root hair cells?
What is the process by which water and minerals are absorbed from the soil into the root hair cells?
What is the name of the plant tissue that transports water and minerals from the roots to the leaves?
What is the name of the plant tissue that transports water and minerals from the roots to the leaves?
What is the direction of water transport in xylem vessels?
What is the direction of water transport in xylem vessels?
What is the type of cell that makes up the xylem vessels?
What is the type of cell that makes up the xylem vessels?
What is the purpose of transpiration in plants?
What is the purpose of transpiration in plants?
What is the main function of water in the uptake and transport of molecules in plants?
What is the main function of water in the uptake and transport of molecules in plants?
How does transpiration impact the process of gas exchange in plants?
How does transpiration impact the process of gas exchange in plants?
What role does water play in providing structural support to plant cells?
What role does water play in providing structural support to plant cells?
How does an increase in temperature affect the rate of water uptake by plants?
How does an increase in temperature affect the rate of water uptake by plants?
What happens to the rate of transpiration when humidity levels increase?
What happens to the rate of transpiration when humidity levels increase?
How does an increase in wind speed impact the process of transpiration in plants?
How does an increase in wind speed impact the process of transpiration in plants?
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Study Notes
Plant Transport
- Plant transport occurs at three scales: intracellular, short distance (cell-to-cell), and long distance (xylem and phloem)
- Intracellular transport involves physical processes such as diffusion, osmosis, and active transport
- Short distance transport involves transport between adjacent cells
- Long distance transport involves transport between roots, stems, and leaves through xylem and phloem tissues
Xylem and Phloem
- Xylem tissue transports water and minerals from roots to all other parts of the plant
- Xylem vessels consist of dead cells with thick, strengthened cellulose cell walls and a hollow lumen
- Phloem tissue transports sugars (sucrose) and amino acids made in leaves to all other plant parts
- Phloem consists of columns of living cells
Water Transport
- Water is absorbed from the soil through root hair cells
- Water is transported through xylem vessels up the stem to the leaves
- Water evaporates from the leaves (transpiration)
Transpiration
- Transpiration is the loss of water vapor out of leaves (and stems) through stomata by diffusion
- Transpiration occurs in three stages:
- Evaporation of water from mesophyll cells in leaves
- Diffusion of water vapor through stomata into the air
- Transpiration stream: water moves from higher to lower water potential
- Transpiration is affected by weather conditions, including temperature, wind speed, light intensity, and humidity
Importance of Water in Plants
- Water is a solvent for the uptake and transport of molecules
- Water is a major component of cells
- Water is a good medium for biochemical reactions
- Water provides structural support via turgor pressure in leaves
- Water is involved in plant movements and temperature stabilization
- Water is the medium for the transfer of plant gametes
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