Biology 3.1.3 Translocation

What is translocation?

Where are assimilates loaded into the phloem?

Where are assimilates removed from the phloem?

In which way do assimilates flow: source to sink, or sink to source

Give an example of how a leaf can be a source and a sink at different times

Give an example of how roots can be a source and a sink at different times

Describe the term mass flow

What is hydrostatic pressure?

How are assimilates loaded into the source? (refer to water potential and transport processes)

How are assimilates removed from the phloem at the sink? How is the hydrostatic pressure gradient maintained?

What are the two routes in which sucrose is loaded into the phloem? Describe them

In what form are assimilates transported around the plant (what substance)? Why?

What process allows sucrose molecules to pass into the phloem?

Describe the process of active loading

What protein transports H+ ions back into the companion cell?

What is tree ringing? What happens? How does it support the idea of phloem?

How do we know that active loading requires energy (ATP)?

What evidence is there against the theory of translocation?