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21 Cards in this Set
- Front
- Back
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Xylem |
Transports water and minerals from roots to shoots. |
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Phloem |
Transports products of photosynthesis from where they are made or stored to where they are needed. |
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Phyllotaxy |
The arrangement of leaves on a stem. |
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Protoplast |
The living part of the cell which also includes the plasma membrane. |
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Aquaporins |
Transport proteins that facilitate the transport of water molecules across plant cell plasma membranes. |
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Aquaporins |
Transport proteins that facilitate the transport of water molecules across plant cell plasma membranes. |
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Bulk flow |
The movement of liquid in response to a pressure gradient. |
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Endodermis |
The innermost layer of cells in the root cortex. |
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Casuarina strip |
The barrier that blocks minerals from passing into the vascular cylinder via the apoplast. |
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Transpiration |
The loss of water vapor from leaves and other aerial parts of the plant. |
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Guttation |
The exudation of water droplets that can be seen in the morning on the tips or edges of some plant leaves. |
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Cohesion-tension hypothesis |
Transpiration provides the pull for the ascent of xylem sap, and the cohesion of water molecules transmits this pull along the entire length of the xylem from shoots to roots. |
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Cavitation |
The formation of a water vapor pocket which stops the flow of xylem. |
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Circadian rhythms
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Eukaryotic organisms that have internal clocks that operate on a 24 hour cycle which is called a circadian rhythm.
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Abscisic acid
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A hormone that is produced in roots and leaves in response to water deficiency that signals guard cells to close their stomatae.
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Xerophytes
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Plants adapted to arid environments.
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Translocation
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The transport of the products of photosynthesis, carried out by the phloem.
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Phloem sap
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The aqueous solution that flows through sieve tubes which differs from the xylem sap that flows through tracheids and vessel elements.
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Sugar source
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A plant organ that is a net producer of sugar by photosynthesis or by breakdown of starch.
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Sugar sink
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A plant organ that is a net consumer or depository of sugar. These organs include roots, buds, stems, and fruits.
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Self thinning
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Plants may choose to abort some flowers, seeds, or fruits to allow the remaining sugar sinks to be properly supported by the sugar sources. |
