OCR Biology 3.3 Key Definitions

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  • Created by: milly._98
  • Created on: 25-04-16 12:47
Meristem
A layer of dividing cells
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Phloem
Transports dissolved assimilates down the stem
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Xylem
Transports water up the stem
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Vascular Tissue
Consists of cells specialised for transporting fluids by mass flow
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Companion Cells
The cells that help to load sucrose into the sieve tubes
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Sieve Tube Elements
Makes up the tubes in phloem tissue that carries sap up and down the plant
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Plasmodesmata
Gaps in the cell wall containing cytoplasm that connects two cells
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Potometer
A device that can measure the rate of water uptake as a leafy stem transpires
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Transpiration
The loss of water vapour from the aerial parts of a plant, mostly through the stomata in the leaves
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Transpiration Stream
The flow of water through a plant from the roots to the leaves via the xylem vessels
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Adhesion
The attraction between the water molecules and the walls of the xylem vessel
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Cohesion
The attraction between water molecules caused by the hydrogen bonds
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Hydrophyte
A plant adapted to living in water or where the ground is very wet
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Xerophyte
A plant adapted to living in dry conditions
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Assimilates
Substances that have become a part of the plant
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Sink
A part of the plant where those materials are removed from the transport system
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Source
A part of the plant that loads materials into the transport system
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Translocation
The transport of assimilates throughout a plant
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Other cards in this set

Card 2

Front

Transports dissolved assimilates down the stem

Back

Phloem

Card 3

Front

Transports water up the stem

Back

Preview of the back of card 3

Card 4

Front

Consists of cells specialised for transporting fluids by mass flow

Back

Preview of the back of card 4

Card 5

Front

The cells that help to load sucrose into the sieve tubes

Back

Preview of the back of card 5
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