Environmental problems are those problems that are related to the environment and can make a negative impact on nature, on the life of the living organism.Example: Pollution, greenhouse effect, global warming, etc.? Model is a project which helps to understand the topics by visualization.The qualities developed by the model creation are:Helps students to find out the information by searching from different sources.Make the thought process of the student Divergent.Emphasis on students to think critically.Develops the skills of presentation.understand the related topic by concepts. making the environment of the classroom interesting.Emphasis on the students towards teamwork.So option (3) is the correct answer.Additional Information National Exhibition: This is the program in which students represent their projects as models based on their learning.