This study aims to determine the critical thinking skills of class X science students in Talang Ubi District on virus material. Type of quantitative descriptive research. The population of all students of class X Science in Talang Ubi District. The sample used in class X IPA 1 in SMA Negeri 1 Talang Ubi, SMA Negeri 2 Unggulan Talang Ubi, and SMA YKPP Pendopo. Data collection techniques using purposive sampling. Retrieval of data using instruments about the ability to think critically on virus material using the framework developed by Facione (2013), consist of five indicators namely: interpretation, analysis, evaluation, inference, explanation, and self-regulation. The results of the study of Critical Thinking Ability in the District of Talang Ubi can be categorized as low, with a percentage value of 59.26%. For the average number of indicators obtained in Talang Ubi District, namely: interpretation indicator has a percentage of 87.94%, and analytical indicator of 60.27%, and evaluation indicator of 45.52%, an inference indicator of 52.83%, an explanatory indicator by 40.00% and self-regulation indicators by 69.01%. This study can be concluded that the critical thinking ability of high school students of class X IPA in Talang Ubi sub-district on virus material is categorized as low. These results indicate that strategies, teaching materials, and learning media need to be developed to facilitate students' thinking skills.

This research aimed to compile a product development, knowing the feasibility and knowing the effectiveness of challenge-based learning (CBL) modules in an environmental material to empower the critical thinking ability. The research was a research & development model of Borg & Gall. Validation the product was done by material expert, expert of development and design module, expert of device and evaluation of learning , a linguist and practitioner of learning of Biology. Subject of the research was a student of grade X MIA Islamic State Senior High School Karanganyar. This research results are: (1) module in the form of product module for teachers and students CBL based on environmental material was developed based on CBL syntax and indicators of Fascione's critical thinking that visualized in the objective, material, activities , and evaluation items; (2) appropriateness of module for teachers and student based on CBL environment material according to the validation results of qualified as good until very good; (3) Modules based CBL environmental material is effective to improve the ability of student critical thinking.

Critical thinking skills are competencies that must be trained in students because these skills are essential to compete in the life of the 21st century. The purpose of this study is to determine the level of critical thinking skills of students in biological material in Muhammadiyah High School throughout Palembang. This research is a qualitative descriptive study; the population and sample in this study were students of class XI IPA Muhammadiyah High School in Palembang. The research instrument used was a test of critical thinking skills as many as 20 multiple choice questions of semester XI biology material 1. The data obtained will be analyzed quantitatively. Quantitative analysis is used to analyze students' test results. The results showed the level of critical thinking skills of students in Muhammadiyah High Schools throughout Palembang City varied; the exceptionally high category was obtained at 1.85%, top category amounting to 14.5%, medium category 66.6%, low category 16.4% and category very low at 0.5%. The results of this study provide information on the profile of students 'critical thinking skills in Muhammadiyah High Schools throughout Palembang City with the highest moderate category so that teachers are expected to be able to design learning process activities that can empower students' critical thinking skills.

The purpose of this study was to determine the effect of Project Based Learning model of the student’s creative thinking skills. The methode used in this research was quasi-experimental. Subjects in this study were the seventh semester students of class C the experimental class and class A as the control. The results indicated that there was a significant increase of student’s creative thinking skills in experimental class compared to the control class which was indicated by N-gain test result (0.004 <0.05) in which the average of experimental calss was higher than the control class. The analysis per-indicator showed an increase of experimental class which the Fluence indicator was included in high category, the Flexibility and Originality indicators were fair, and the Elaboration indicator was low. These results were supported by the higher learning activity of student’s experimental class compared to those of control class. In addition, the student rerspons questionnaire showed a positive results to the application of the Project Based Learning model.

Penelitian ini bertujuan untuk mengetahui pengaruh dari model Problem Based Learning terhadap keterampilan berpikir kritis siswa. Metode yang digunakan adalah metode Quasi eksperimen dan desain penelitiannya adalah Non equivalen control group design. Sampel dalam penelitian ini adalah kelas X MIPA 3 SMA Unggul Negeri 4 Palembang sebagai kelas eksperimen dan kelas X MIPA 4 SMA Unggul Negeri 4 Palembang sebagai kelas kontrol. Teknik pengumpulan data yang digunakan adalah teknik tes tertulis berupa soal yang yang berbentuk uraian yang berjumlah 16 soal yang mengacu kepada soal berpikir kritis. Uji Hipotesis yang digunakan adalah uji t data berpasangan (paired sample t test), hasil yang diperoleh dari perhitungan Paired Sample T-Test dengan (0,05%) didapatkan nilai signifikansi (2-tailed) 0,000 < 0,05, dengan nilai t-hitung lebih besar dari t-tabel, yaitu didapat nilai t-hitung adalah 7,923 dan nilai t-tabelnya adalah 2,042. Artinya dapat disimpulkan bahwa model Problem Based Learning berpengaruh terhadap keterampilan berpikir kritis siswa kelas X pada materi keanekaragaman hayati