Medicinal plants are plants that can be used for the treatment of diseases with active ingredientscontained in them. Identification of medicinal plants needs to be done because of the variety ofmedicinal plants currently available. This study aims to find out which plants are used as medicine,which parts of the plant are used and how to manage and diseases that can be cured by medicinalplants in Talang Kelapa District. This research is descriptive qualitative with quota samplingtechniques and triangulation techniques as well as data analysis techniques modeled by Miles andHuberman. The results of identification studies in Talang Kelapa District were obtained by 38species from 22 families of medicinal plants. The most used part is leaves, besides the roots, stems,flowers, fruits, rhizomes, sap, tubers and all parts. Some diseases that can be cured by these plantsinclude diabetes, hypertension, cholesterol, fever, diarrhea, itching, canker sores and eliminatemenstrual pain which is processed by mashing then smeared, dripped, dried and pasted, brewedand consumed directly as a vegetable, vegetables or other food mixes. But the management methodthat is in great demand is boiled.

Biolarvicide is the larvicide derived from plants and relatively safe. The objective of this study was to determine the effect of pletekan leaf powder (Ruellia tuberosa), mimosa (Mimosa pudica), papaya (Carica papaya), and guava (Psidium guajava) on Culex quiquefasciatus larval mortality. The method was an experimental with a completely randomized design consisted of 5 treatments (0 gr, 0,25 gr, 0,5 gr, 0,75 gr, and 1 gr) and 5 repetitions for each plant. The data were analyzed by analysis of variance. Based on the results, leaf powder used in the study, namely guava leaves powder (1 gr), mimosa (1 gr), leaves of pletekan (1 gr), and leaves of papaya (1 gr) showed a very significant effect (P < 0,05) on Culex quiquefasciatus larval mortality. It can be concluded that the pletekan, mimosa, papaya, and guava had the potential as biolarvicide of Culex quinquefasciatus.

The learning model with an approach that can be used to achieve cognitive success is by using the PBL model with the STEM approach. This study aims to determine the effect of the PBL model with the STEM approach on the cognitive competence of students in the digestive system material for class XI in SMA / MA. This research was conducted from January to February 2021. The method in this study was a real-time experiment or pre-experimental one group pre-test - post-test design. Pre - experimental one group pre-test - post-test design. The population in this study were students of class XI. The sample in the study consisted of 18 students who were an experimental class taken using test techniques. The test technique here is an objective test, namely multiple choice and essays or questions about this technique will be carried out before and after the research (pretest and posttest). The data in this study were obtained from a number of quantitative data, namely the cognitive aspects obtained from the pre-test and post-test scores. After the data has been obtained, the next step is to analyze the data. This can be seen from the results of the t-test used to calculate the hypothesis and test the level of effectiveness. The results showed that the PBL model with the STEM approach showed differences in the cognitive competences of students. This can be proven by the 2 tailed significance value is 0.000, which is less than 0.05, which means that H0 is rejected and Ha is accepted. Data analysis techniques can be proven by the results of the N-gain test value. This can be proven by the difference between the pre-test and post-test results of the experimental class, namely 46.5 - 65.3 = 33.67%. Conclusion. That the PBL learning model with the STEM approach has an effect on the results of students' cognitive competencies is acceptable. This can be proven by the normality, homogeneity, t-test and N-gain test. The effect of the application of PBL model learning with the STEM approach is a moderate criterion. �

Retention is the key to the success of a learning program. Several studies have shown that retention can be influenced by metacognitive skills, critical thinking, cognitive learning outcomes, and applied learning models. Meanwhile, testing the relationship between the three factors mentioned above and retention is only done using simple and multiple regression with two factors. This correlational study was conducted to determine the relationship between three factors, namely metacognitive skills, critical thinking, and cognitive learning outcomes on retention in students taught by RQA and QASEE learning models, as well as conventional learning. A total of 107 pre-service teachers of Biology Education students in South Sumatra, Indonesia, were involved in this study. The results showed a relationship between metacognitive skills, critical thinking, and cognitive learning outcomes with retention in students who were taught the RQA learning model. However, in the QASEE learning model and conventional learning, this relationship was not found. Thus, it can be concluded that more than two factors affect retention. Then, applying the appropriate learning model also influences the success of a learning program. Finally, conventional learning that only emphasizes efforts to get students to pass the exam must be abandoned immediately.