Identify the location and function of the following structures:
$(i)$ Casparian strips
$(ii)$ Starch sheath

(N/A) $(i)$ Location: Found in the endodermal cells of dicot roots,where suberin and lignin thicken the radial and tangential walls in the form of a strip.
$\Rightarrow$ Function: Acts as a barrier that is impermeable to water,forcing water to move through the symplastic pathway.
$(ii)$ Location: Found in the endodermis of dicot stems (e.g.,sunflower),where the cells contain abundant starch grains.
$\Rightarrow$ Function: Serves as a storage site for starch,hence it is often referred to as the starch sheath.