Statement-$1$: The endodermis in a dicot stem is also known as the starch sheath.
Statement-$2$: The cells of the endodermis are rich in starch grains.

• A
  Statement-$1$ is true,Statement-$2$ is true. Statement-$2$ is not the correct explanation of Statement-$1$.
• B
  Statement-$1$ is false,Statement-$2$ is true.
• C
  Statement-$1$ is true,Statement-$2$ is false.
• D
  Statement-$1$ is true,Statement-$2$ is true. Statement-$2$ is the correct explanation of Statement-$1$.