what is the mechanism of phloem transport
Answers
Answer: Phloem is a vascular tissue which transports food in our body
Answer:
(1) The part of plant where food is synthesized is known as source and where it is utlizeds sink.
(2) Food is translocated through phloem tissue in the form of sucrose along the concentration gradient from source to sink.
(3) Munchs pressure flow theory or mass flow hypothesis is widely accepted theory for sugar transport.
(4) Glucose is synthesized in photosynthetic cells hence endo-osmosis occurs due to increased osmotic concentration.
(5) With this turgor pressure increases and sugar is forced in sieve tube of vein from photosynthetic cell - Vein loading.
(6) At the sink, sugar is uilzed and excess amount converted to starch, hence osmotic concentralion is lowered and exosmosis takes place.
(7) Turgor pressure is lowered hence turgor pressure gradient is set and food is translocated passively against concentration gradient- Vein unloading