Experimental learning combined with theoretical learning enhances the conceptual understanding of a subject. Therefore, the Online Labs (OLabs) that hosts science experiments was developed. OLabs uses interactive simulations with theory, procedure, animations, videos, assessments and reference material. Our study blended OLabs with concept maps to examine if it enhances students' learning in Biology. Concept mapping is a framework that provides a deeper knowledge of a subject by understanding the relationships among concepts. The study was quasi-experimental; pre-test, post-test and a satisfaction survey was used as measurement instruments. The study sample was 54 students from a school in Haripad, Kerala, India. The students were randomly grouped into a control and an experimental group. The experimental group that used concept maps as a learning aid scored slightly higher, suggesting blending concept maps can lead to a deeper understanding of the subject. Gender difference did not significantly affect the scores.