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All Journal Biotropika Biosfer: Jurnal Pendidikan Biologi
Jannah, Na'imatul
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Education Immunology & microbiology

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Problem-based blended learning: The student's critical thinking skills in the respiratory system Jannah, Na'imatul; Saifuddin, Much Fuad
Biosfer: Jurnal Pendidikan Biologi Vol. 17 No. 2 (2024): Biosfer: Jurnal Pendidikan Biologi
Publisher : Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/biosferjpb.36522

Abstract

Critical thinking skills should be integrated into high school biology education through problem-based blended learning.. This study aims to determine the effect of the Problem-Based blended learning model on students' critical thinking skills in the material on the respiratory system at SMA A. This quasi-experimental study used a nonrandomized control group, pretest-posttest design involving 2 XI classes, namely the control class, which consisted of 33 students and 32 students in the experimental class. Collecting data on critical thinking skills is using a test technique. The test instrument used is a question sheet (pretest and posttest). The data analysis consisted of analysis prerequisites in the form of a normality test and homogeneity test, as well as hypothesis testing in the form of the Mann-Whitney test. This study's results indicate a significant influence on students' critical thinking skills in the respiratory system material for class XI at SMA A after applying the Problem-Based blended learning model assisted by Google Classroom. This can be seen from the average test of critical thinking skills in the experimental class, which is higher than the control class.
Seed Priming and Silicon-Based Fertilizer Application Enhanced Salinity Tolerant of Tobacco Plant (Nicotiana tabacum L.) Jannah, Na'imatul; Rachmawati, Diah
Biotropika: Journal of Tropical Biology Vol. 14 No. 2 (2026)
Publisher : Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.biotropika.2026.014.02.13

Abstract

Tobacco (Nicotiana tabacum L.) is an important commodity due to its high economic value and utilisation. However, tobacco productivity is still suboptimal due to soil salinity. One effort that can be made to overcome salinity stress is to develop more tolerant tobacco varieties. To increase plant tolerance to salinity stress, seed priming and the application of silicon-based fertilisers to the growing medium can be carried out. Seed priming treatments, which control seed hydration, can increase seed germination. Silicon (Si) is a beneficial element that plays a role in increasing plant tolerance to stress. This study aims to examine the effect of seed priming and calcium silicate application on 'Jember Sili' tobacco in saline soil by observing germination, growth, and physiological responses. This Completely Randomized Design (CRD) study consisted of two factors: seed priming with calcium silicate (0 mM, 1 mM, 2 mM) and calcium silicate (CaSiO3) addition to the growing medium (0 mM, 1 mM, 2 mM). Data were analysed using SPSS for ANOVA, followed by DMRT at a 95% significance level. Tobacco (Nicotiana tabacum L. 'Jember Sili') responded positively to varying concentrations of calcium silicate priming, particularly at 1 mM, as indicated by a significant increase in germination percentage, germination rate, vigour index, Timson Germination Index (TGI), and Mean Germination Time (MGT). The 1 mM concentration was also optimal for increasing plant height, leaf number, dry weight of shoots and roots, and root length. Tobacco priming and calcium silicate application in low-saline soil also increased chlorophyll, carotenoid, and SOD levels. But it reduces H2O2 levels and MDA levels.
Co-Authors DIAH RACHMAWATI Much. Fuad Saifuddin