A) 3-5 mm/h
B) 3-5 cm/h
C) 1-15 cm/h
D) 60-100 cm/h
Correct Answer: D
Solution :
Dixon (1923) reported that the sieve tube contents move at the rate of SO cm per hour while the simple diffusion of sugar molecules takes place at the rate of 0.2 mm per day.
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