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10 Cards in this Set

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  • Back
Explain the need for larger organisms to have a transport system.
As an organism increases in size, the surface area to volume ratio decreases and gases are unable to diffuse enough
Explain why transpireation is an inevitable consequence of gas exchange.
The guard cells become turgid which opens the stoma. Gases diffuse in and out, and water is evaporated from mesophyll cells.
Explain water potential.
Water potential is the ability of a solution to pull water towards it by osmosis.
Describe water potential.
Pure water has a water potential of zero. So any solution has a negative water potential. A concentrated solution has a very negaitve water potential.
How does water pass from the soil to the root.
Describe the mechanism of how water moves from cell to cell.
Either apoplast or symplast.
Differentiate between apoplast and symplast pathways.
Apoplast goes through the non living parts in between the cell walls and membranes. The symplast moves through the living.
What are plasmadesmata?
Small gaps in the cell walls of plant cells that speed up the passage of water by osmosis.
Define translocation
Is the movement of organic compounds around the plant through thre phloem from a source to a sink.
What are the 2 main mechanisms that xerophyrtes use.
Reduce the diffusion gradient, or they reduce surface area of their leaves.