2.3B Translocation (in phloem)

Question 1

what is translocation

Answer 1

the active (ATP) movement of the soluble products of photosynthesis (sucrose + amino acids) through the phloem, from source to sink

Question 2

where is the source(production)

Answer 2

leaf

Question 3

where is the sink(where products are required)

Answer 3

roots

Question 4

explain the process of MASS flow translocation

Answer 4

• sucrose actively pumped into phloem by companion cells
• water potential decreased, water diffuses from xylem via osmosis
• hydrostatic pressure increases ∴ water + solutes forced downwards (to relieve pressure) = MASS FLOW