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Transport in Plants — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYTransport in Plants3 Marks
Question
Explain why xylem transport is unidirectional and phloem transport bi-directional.
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Answer

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.

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