If you define integer variable and a object variable and a structure then how those will be plotted in memory.

Integer , structure – System.ValueType -- Allocated memory on stack , infact integer is primitive type recognized and allocated memory by compiler itself .
Infact , System.Int32 definition is as follows :
[C#]
[Serializable]
public struct Int32 : IComparable, IFormattable, IConvertible
So , it’s a struct by definition , which is the same case with various other value types .
Object – Base class , that is by default reference type , so at runtime JIT compiler allocates memory on the “Heap” Data structure .
Reference types are defined as class , derived directly or indirectly by System.ReferenceType