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Translocation
the phloem transports the products of photosynthesis from the source to the sink
Source
the leaf
Sinks
area/use of storage
Companion cells
where most cell organelles are
very biochemically active
where metabolic processes occur
Sieve tubes
filter and lose most cell organelles to make space for transport
What is the mass flow hypothesis
suggests there is a passive mass flow of sugars from the phloem of the leaf where there is a highest concentration (the source) to other areas such as growing tissues where there is a lower concentration (the sink)