Translocation (OCR GCSE Biology A, Combined (Gateway Science Suite)): Flashcards
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What is translocation?
What is translocation?
Transport of sugars & nutrients from leaves via phloem
Which vessels transport sugars?
Which vessels transport sugars?
Phloem vessels
Main sugar form transported in translocation
Main sugar form transported in translocation
Sucrose
Source in translocation
Source in translocation
Leaves (where sugars are produced)
Sink in translocation
Sink in translocation
Where sugars are used or stored
Two components of phloem tissue
Two components of phloem tissue
Sieve tube elements and companion cells
Direction of movement in translocation
Direction of movement in translocation
Both directions (up and down)
What drives sugar flow in phloem?
What drives sugar flow in phloem?
Pressure differences between source and sink
Hypothesis explaining translocation mechanism
Hypothesis explaining translocation mechanism
Pressure-flow hypothesis
Storage form of excess sugars in plants
Storage form of excess sugars in plants
Starch
How does increased photosynthesis affect translocation?
How does increased photosynthesis affect translocation?
Enhances/increases translocation rate
How does temperature affect translocation?
How does temperature affect translocation?
Increases rate by speeding up metabolism
What role does water play in translocation?
What role does water play in translocation?
Maintains pressure flow in phloem
Which nutrient is crucial for phloem function?
Which nutrient is crucial for phloem function?
Potassium
Tracer used to measure translocation
Tracer used to measure translocation
Carbon-14 (radioactive isotope)