Question

What prevents wall to wall apoplast movement of absorbed water casparian strips?

Answer 1

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Inside a plant, the apoplast is the space outside the plasma membrane within which material can diffuse freely. It is interrupted by the Casparian strip in roots, by air spaces between plant cells and by the plant cuticle. ... The apoplastic route facilitates the transport of water and solutes across a tissue or organ.

Answer 2

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1. Casparian strip is band of waterproof, corky tissue that is found on the side and walls of the endodermis of roots.
2. The strip prevents water from entering the pericycle except through the cytoplasm of endodermal cells; this may be important in producing root pressure.

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