Constructivism is a new approach in education that claims humans are better able to understand the information they have constructed by themselves. According to constructivist theories, learning is a social advancement that involves language, real world situations, and interaction and collaboration among learners. Co-operative learning strategies are based on social constructivism which is one of the main streams of constructivism. In this concept, students work in a small group and collectively for better learning. Students get the chance for the active participation than the passive listener like in traditional teaching methods. In the present study, an attempt was made to check the effectiveness of co-operative learning strategies and Lecture method on B. Ed students in Science Education subject. The Post Test- Only, Two Equivalent Groups – Experimental and control group Design was used for the present research. A significant achievement was seen in experimental group based on co-operative learning strategies as compare to control group instructed by Lecture method in B. Ed students.