Plant Tissues, Organs & Systems (AQA GCSE Biology): Flashcards
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Definition of translocation
Definition of translocation
Transport of dissolved sugars and organic nutrients from leaves to other plant parts
Vessels where translocation occurs
Vessels where translocation occurs
Phloem vessels
Main form of sugar transported in translocation
Main form of sugar transported in translocation
Sucrose
What 'source' means in translocation
What 'source' means in translocation
Where sugars are produced (leaves)
Two components of phloem tissue
Two components of phloem tissue
Sieve tube elements and companion cells
Direction of sugar movement in phloem
Direction of sugar movement in phloem
Both directions (up and down)
What drives sugar flow in phloem
What drives sugar flow in phloem
Pressure differences between source and sink
What 'sink' means in translocation
What 'sink' means in translocation
Where sugars are used or stored
Hypothesis describing translocation process
Hypothesis describing translocation process
Pressure-flow hypothesis
Effect of high photosynthesis rate on translocation
Effect of high photosynthesis rate on translocation
Increases translocation rate (more sugar available)
Effect of higher temperature on translocation
Effect of higher temperature on translocation
Increases rate by speeding up metabolism
Role of water in translocation
Role of water in translocation
Maintains pressure flow in phloem
Nutrient crucial for phloem function
Nutrient crucial for phloem function
Potassium
Radioactive tracer used to measure translocation
Radioactive tracer used to measure translocation
Carbon-14
Why non-photosynthetic parts need translocation
Why non-photosynthetic parts need translocation
They rely entirely on it to receive sugars