CBSE Class 7 Answered
why translocation is bidirectional and ascent of sap is undirectional?
Asked by arajeevshashank | 16 Feb, 2018, 07:34: PM
Expert Answer
Translocation is same as ascent of sap. There is a fact that "xylem transport is unidirectional and phloem transport is bi-directional.
Water is absorbed by the roots from the soil, so it moves only in the upward direction through the xylem. Hence, the water transport is unidirectional. Food is formed in leaves and is required by both the root system and the shoot system of the plant. Food is transported by the phloem. Phloem sap moves upwards and downwards making the food transport bidirectional so that it may reach to every part of the plant.
Answered by Sivanand Patnaik | 18 Feb, 2018, 05:17: PM
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