Transport in Plants Flashcards
(19 cards)
Why do multicellular plants need transport systems?
Plants are large and need to move water and nutrients over distance
What is the vascular system in plants?
Xylem and phloem.
What is the structure and function of xylem vessels?
Lignified tubes transporting water and minerals.
What is the structure and function of phloem sieve tube elements?
Living cells transporting sugars.
What is the structure and function of companion cells?
Provide ATP and support for sieve tubes.
What is transpiration?
Evaporation of water from leaves.
What environmental factors affect transpiration rate?
Temperature, humidity, wind, light.
What is the purpose of using a potometer?
Measures water uptake
What are the pathways taken by water through a plant?
Apoplast and symplast pathways.
What is the apoplast pathway?
Water moves through cell walls
What is the symplast pathway?
Water moves through cytoplasm via plasmodesmata.
What is the role of water potential in water movement?
Drives water from soil into roots.
What is the transpiration stream?
Continuous movement of water from roots to leaves.
What are the roles of adhesion and cohesion in water transport?
Continuous movement of water from roots to leaves.
What adaptations do xerophytes have?
Thick cuticle, sunken stomata, rolled leaves
What adaptations do hydrophytes have?
Stomata on top, large air spaces, no cuticle.
What is translocation?
Movement of sugars in phloem.
What are sources and sinks in translocation?
Sources: where sugars made. Sinks: where sugars used
What is active loading in phloem transport?
