Discussion
Which one of the following statements on Casparian strips is correct?
Answer: C
The correct statement is that Casparian strips act as a cellular barrier to allow selective nutrient uptake and exclusion of pathogens.
The Casparian strip is a band of suberin and lignin in the radial and transverse walls of the root endodermis. It blocks the apoplastic path, so water and solutes must cross the endodermal plasma membranes, where uptake is selective, and it also hinders the entry of pathogens into the stele.
It is found in the endodermis (and in some plants an exodermis), not the epidermis, and it is a feature of roots, not mainly of shoots. Non-vascular plants such as mosses have no endodermis or vascular tissue at all, so the strip cannot be common in them.
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