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14 Cards in this Set
- Front
- Back
Name all the cell Organelles
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Why do multicellular plants need transport systems?
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1) Plants need substances like water, minerals and sugars.
2) Small SA:V ratio - diffusion too slow 3) To move substances to individual cells quickly |
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Describe how the structure of Xylem vessels relates to their function
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1) Made fron dead cells aligned end-to-end
2) Pits in the lignified walls allow water to move sideways from one vessel to another 3) Amount of lignin increases as the cell gets older |
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Give four reasons why the flow of water is not impeded in the Xylem.
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1) No end walls
2) No cell contents 3) There is no nucleus or cytoplasm 4) Lignin thickening prevents walls from collapsing |
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What is the function of Phloem tissue?
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To transport sugars across the plant. Up or down the stem.
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Phloem tissue consists of two types of cell:
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Sieve tube elements
Companion cells |
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Sieve tubes are lined up ___-___-___ to form a tube, in which the plants transports _____. The sucrose is dissolved in ____ to form ___. The tube contains sieve ____ at intervals.
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End-to-end, sugars, water, sap, sieve plates.
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In which part of the Phloem does the plant transport sugars?
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Sieve tubes
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The sieve tubes have very ____ walls.
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Thin.
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The sieve tubes allow ____ to pass through
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Solutes like sugars.
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For every sieve tube element there is a?
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Companion cell
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What is the function of companion cells?
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Companion cells have numerous mitochondria, these produce ATP which help load sucrose into the sieve tubes.
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The cytoplasm of companion cells and sieve tube elements are linked through many ________.
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Plasmodesmata.
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What is the function of Xylem tissue?
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To transport water and minerals from the roots up to the leaves and other parts of the plant.
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