phloem and transloction

Question 1

transfer cell

Answer 1

load sucrose into sieve tube at source. uload at sink

Question 2

sieve tube

Answer 2

sieve plates and sieve pores to allow fluid to flow through

Question 3

companion cell

Answer 3

organelles that support.eg- mitochondria to provide mtabolic support for sieve tubes

Question 4

peripheral cytoplasm

Answer 4

few organelles so less resistance to fluid flow

Question 5

trabsloction

Answer 5

sucrose produced at source
transfer cell pump sucrose into phloem sieve tubes using energy in the form of ATP
high sucrose conc in sieve tubes at source
draws water into sieve tubes by osmosis from adjacent xylem vessels- increase hydrostatic press at loading end
fluid flow from high to low hydro press by mass transport
sucrose actively unloaded in sinks
solute conc lower in sieve tube at sink
water move back into xylem- osmosis
decrease hydro press