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Dynamic allocation is the process of allocating memory to objects during runtime using pointers and the 'new' keyword. The constructor is a special member function of a class that is executed whenever an object is created. The main role of a constructor is to initialize the object's attributes.

Yes, when a class object is dynamically allocated in memory, its constructor is executed. The constructor is executed when you create an object through dynamic allocation or through normal object declaration. In both cases, every time you create an object, the constructor is called to initialize object attributes.

The constructor is executed at the time of object creation. In the case of dynamic allocation, it happens when you use the 'new' keyword to allocate memory and create an object. The 'new' keyword first allocates memory and then calls the constructor to initialize the object's attributes. For example, consider the following code snippet: ```cpp class MyClass { public: MyClass() { cout << "Constructor called" << endl; } }; int main() { MyClass *obj = new MyClass(); // Constructor is called here when memory is dynamically allocated and object is created return 0; } ``` When you run this code, you will see the output "Constructor called," indicating that the constructor was executed during dynamic allocation.