Step 1: Understanding the pie chart.
The pie chart is divided into three equal sectors representing Wheat, Ragi, and Rice. Each sector has an angle of $120^\circ$, as clearly shown in the diagram.
Step 2: Identifying the shaded portion.
The shaded portion corresponds to the Rice sector, which measures $120^\circ$.
Step 3: Calculating the percentage.
The total angle of a pie chart is $360^\circ$.
\[
\text{Percentage of shaded portion} = \left( \frac{120^\circ}{360^\circ} \right) \times 100
\]
\[
= \frac{1}{3} \times 100 = 33.33%
\]
Step 4: Conclusion.
The percentage of the shaded portion shown in the pie chart is 33.33%.
