Q. The translocation of organic solutes in sieve tube members is supported by :
A) root pressure and transpiration pull
B) P-proteins
C) mass flow involving a carrier and ATP
D) cytoplasmic streaming
Explanation
[Solution from source] Food moves in sieve tubes by mass (pressure) flow, and loading of sugars into sieve tubes uses carrier proteins and ATP. Root pressure and transpiration pull move water in xylem, not food in phloem. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.