<![CDATA[Based on observation and interview of Biology teacher of Al-Kautsar Senior High School students critical thinking skill were not optimally developed yet. This experiment aims to find out the influence of applying pictured card media combined with Jigsaw cooperative learning modeltowards improvement of students critical thinking skill. This study is quasi experiment using pretest posttest group non- equivalent design. Sample were students from X7 and X6 class which obtained from population by random sampling technique. Quantitative data was obtained from the average of pretest and posttest scores and was statistically analyzed using t-test in 95% confidence levels. Qualitative data were student’s learning activities and students responses and was analyzed descriptively. Result of this study shows that the average of student`s critical thinking skill and student learning activities percentage in all observed aspects improve significantly. The students also gives good responses toward applying pictured card media through cooperative learning model type Jigsaw. Keywords: picture card media,, cooperative learning of Jigsaw type critical thinking skill, protista]]>
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