Q13 of 16 Page 11

What is the essential role the root endodermis plays during mineral absorption in plants?

The root endodermis has a layer of suberin in this layer which has the ability to actively transport ions only in one direction.

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11 Describe transpiration pull model of water transport in plants. What are the factors influencing transpiration? How is it useful to plants? 12 Discuss the factors responsible for ascent of xylem sap in plants. 14 Explain why xylem transport is unidirectional and phloem transport bi-directional. 15 Explain pressure flow hypothesis of translocation of sugars in plants.