Q. Transport of organic solutes is supposed to take place by pressure flow hypothesis through phloem tissue from source to sink. Choose the false statement about vascular tissue transport
A) Phloem transport mainly water and sucrose but other sugars, hormone and aminoacids are also transported
B) Water enters into the sieve tube by the process of osmosis
C) Water and solute move through the sieve tube along the pressure gradient
D) Sieve tube in the source have a low turgor pressure (pressure potential)
Explanation
Translocation of organic nutrients by phloem can be explained accurately by pressure flow model of Munch. According to the model, the source region always shows higher osmotic concentration. Sieve tube with loaded organic food absorb water from nearby xylem and develop a higher turgor pressure. Movement of organic food occur from an area of higher turgor pressure to a region of lower turgor pressure
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.