Multiple choice Rate of translocation of photosynthesis in sieve tubes is 3-5 mm/hour 3-5 cm/hour 13-15 cm/hour 50-100 cm/hour Reveal answer Fill a bubble to check yourself D Correct answer Explanation The rate of translocation of organic solutes (photosynthates) in the phloem sieve tubes is generally accepted to be in the range of 50 to 100 cm/hour.