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