Multiple choice

To which part of the root is the starch sheath of dicot stem homologous?

  1. Bundle sheath

  2. Endodermis

  3. Pericycle

  4. Rhizodermis
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B Correct answer
Explanation

The starch sheath (also called endodermis) in the dicot stem is the innermost layer of the cortex. In roots, the homologous structure is the endodermis, which performs the same function - regulating movement of substances into the vascular cylinder and containing starch grains. The endodermis is present in both stems and roots but is most conspicuous as a starch sheath in dicot stems.

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