Assessment and evaluation is one of the most important aspect of the teaching-learning process. Formative assessment plays a key role in evaluation the understanding of the students on regular basis. Concept maps is one such tool which can be used to evaluate the students. Hence keeping this in mind the study conducted focused on investigating the use of concept maps in the teaching of Science which is full of processes and complex concepts. The experimental study conducted on standard sixth students focussed on their ability to make concept maps to represent their understanding of the topics taught by the teacher in the classroom. These findings suggest the importance of using concept maps in teaching of Science to enhance students critical thinking, retention, interest, creativity and the comprehension level. The study emphasized the significance of concept map as a tool and its implications focussing on knowing the students perspectives, support holistic learning and support students discussion.