In AngularJS, a 'root scope' refers to the top-level scope that exists for the entire application. It serves as the global scope accessible to all controllers and views within the application. The root scope is created when the AngularJS application is initialized and provides a common space for sharing data and functions across different parts of the application. Understanding the concept of the root scope is essential for effective data management in AngularJS.

Directives in AngularJS play a pivotal role in dynamic view manipulation. They allow the creation of custom HTML tags and attributes, enabling developers to extend HTML syntax and create reusable components. By attaching behavior to elements, directives facilitate dynamic updates to the DOM, enhancing the flexibility and maintainability of AngularJS applications. Understanding the role of directives is essential for effective front-end development in AngularJS.

While $scope is essential for data binding and communication in AngularJS, improper use can impact the debugging process. Excessive use of $scope can make the scope hierarchy complex, making it challenging to trace variable values and dependencies during debugging. Developers may encounter difficulties understanding the flow of data between controllers and directives. Therefore, a judicious and organized use of $scope is necessary to streamline the debugging process in AngularJS applications.

The ng-model directive in AngularJS is primarily used for two-way data binding. It binds the value of HTML elements (like input, select, and textarea) to a property on the model. When the user interacts with the UI, changes are automatically reflected in the model, and vice versa. Understanding and using ng-model is essential for implementing efficient and dynamic forms in AngularJS applications.

By using Modules, $scope can avoid conflicts and ensure modularity in large AngularJS applications. Modules are a way to organize and structure an AngularJS application. They help in encapsulating code, defining boundaries, and managing dependencies, leading to a more modular and maintainable codebase. Understanding how to use Modules is essential for building scalable and organized AngularJS applications.

AngularJS's ng-model directive is used to bind HTML elements to data in the model. It creates a two-way data binding, allowing changes in the view to automatically update the model and vice versa. Understanding and using ng-model is fundamental for handling user input and updating data dynamically in AngularJS applications.

In AngularJS, the controller is linked to the view through data binding. Data binding establishes a connection between the controller (which manages the application logic) and the view (which handles the user interface). As the controller updates the model, the changes are automatically reflected in the view, ensuring a seamless and dynamic user experience. Understanding this linkage is essential for building interactive and responsive AngularJS applications.

The Dependency Injection pattern in AngularJS MVC facilitates modular and maintainable code structure. Dependency Injection is a design pattern where components receive their dependencies from an external source rather than creating them internally. In AngularJS, this pattern is crucial for achieving loose coupling between components, making the code more modular, and enhancing testability and maintainability.

The primary function of the scope in AngularJS is to manage data binding between the controller and the view. It serves as the glue that connects the controller, where application logic resides, with the view, responsible for user interface presentation. Understanding scope is crucial for achieving two-way data binding, where changes in the model (data) automatically reflect in the view and vice versa.

In AngularJS, expressions can be used within ngClass and ngStyle directives to dynamically assign classes or styles to HTML elements. The ngClass directive allows dynamic class binding based on expression evaluation, while ngStyle enables dynamic style assignment. This capability enhances the flexibility and responsiveness of AngularJS applications by allowing dynamic updates to the presentation layer based on changing data or user interactions.