Problem 88
Mass flow hypothesis was first described by (a) Swanson (b) Buchman (c) Kursanov (d) Munch.
Problem 89
A girdled plant (upto bast) may survive for some time b it will eventually die, because (a) water will not move downwards (b) water will not move upwards (c) sugars and other organic materials will not m downwards (d) sugars and other organic materials will not m. upwards.
Problem 90
Ringing/girdling experiments demonstrate (a) phloem is responsible for translocation of food (b) xylem is responsible for ascent of sap (c) transpiration pull (d) both (a) and (b).
