Cooperative teaching methods have emerged as a significant paradigm shift from traditional teaching methods, highlighting notable benefits that have a profound influence on academic achievement. Guided by previous studies on cooperative teaching methods, we examined the effectiveness of teaching methods (jigsaw vs. lecture-cum-demonstration methods) on the academic achievement of biology among class 11 students. The sample comprised 68 students in class 11. In a school setting, 35 participants were randomly assigned to the experimental group, and 33 were assigned to the control group. The study utilized a quasiexperimental research design to assess the effectiveness of different teaching methods. Specifically, a nonequivalent control group design was employed, comprising one experimental group and one control group. To ensure comparability between the groups in terms of academic performance, Raven's Progressive Matrices Intelligence test score was used as a covariate. The results revealed that class 11 biology students in the experimental group had notably higher test scores than did those in the control group. Additionally, the study revealed that gender did not significantly influence academic achievement in biology for class 11 students when intelligence was used as a covariate. The academic achievement of class 11 biology students appears to be independent of the interaction between gender and method of teaching. We explicitly demonstrate that the jigsaw technique can enhance the biology achievement of senior secondary school students and can serve as an effective alternative to traditional experimental teaching methods in India.