This study investigated effects of advanced organizers on retention and performance in conservation concepts among secondary Biology students in Jahun, Jigawa State, Nigeria. One hundred and thirty seven (137) students were randomly selected from eleven (11) senior secondary schools that constituted the sample for the study from a total population of one thousand two hundred and twenty five (1225) SSII students in Jahun zone. The study adopted the pretest, post test and post-post test quasi experimental and control group design. The students in experimental group were taught using lecture method enriched with advanced organizers while those in control group were taught using lecture method for the period of six weeks. The topic taught was conservation of natural resources from senior secondary school curriculum. The instrument used for data collection was Conservation Concept Performance Test (CCPT) with reliability coefficient of 0.89. Four Research questions and four null hypotheses were formulated and tested using independent t-Test at 0.05 level of significance. Pictorial and textual advanced organizers were developed, also a lesson plan was developed for experimental and control groups. The major findings from the study include: obtaining a significant difference between the mean academic performance scores of students taught conservation concepts with advanced organizers and those taught without advanced organizers in favour of the former. There is also a significant difference between the mean retention scores of students taught conservation concepts with advanced organizers and those taught without advanced organizers in favour of the former. Another finding is that there is no significant difference between the mean academic performance scores of male and female students taught conservation concepts with advanced organizers .There is also no significant difference between the mean retention scores of male and female students taught conservation concepts with advanced organizers. Based on the findings it was recommended that advanced organizers be used by biology teachers to teach in senior Secondary Schools among others.