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All Journal Jurnal Biologi Tropis Jurnal Pendidikan Ilmu Pengetahuan Alam (JP-IPA)
Isnanto, Erliana Putri
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Education Immunology & microbiology Physics

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Long Periodism on the Speed of Nine O’clock Flowers (Portulaca grandiflora) Oktaviani, Intan; Agustina, Melinda; Susanti, Hemalia; Sundari, Muncar; Isnanto, Erliana Putri; Putri, Khalisah Nabila
Jurnal Biologi Tropis Vol. 25 No. 1 (2025): Januari - Maret
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v25i1.8344

Abstract

Long photoperiods can delay flower initiation and slow down the growth and formation of flower primordia, which can postpone flowering. This study aims to determine the photoperiodic response of the Nine O'clock flower (Portulaca grandiflora) to short light exposure. The research was conducted over one month (November-December 2024), with data collection specifically carried out on December 7, 2024, in Jombor Village, Bendosari District, Sukoharjo Regency, Central Java, from 05:08 AM to 10:00 AM. Observations were made on 19 plants to record blooming times, and data were analyzed descriptively and qualitatively. The results indicated that the blooming times of the Nine O'clock flower varied slightly among the observed plants, with an average blooming time of approximately 2 hours. In conclusion, while the Nine O'clock flower exhibits slight variations in blooming times, further research is recommended, particularly in locations with different altitudes. This study contributes to the understanding of the photoperiodic response of Portulaca grandiflora and its cultivation practices.  
Analisis Kualitas Butir Soal Tes Biologi Menggunakan Rasch Model Oktaviani, Intan; Lestari, Pramesti Ayu; Isnanto, Erliana Putri; Putri, Khalishah Nabilla; Ardiansyah, Muhammad Ilham; Suwarto, Suwarto
Jurnal Pendidikan Ilmu Pengetahuan Alam (JP-IPA) Vol 7, No 2 (2026): Mei 2026
Publisher : STKIP HARAPAN BIMA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56842/jp-ipa.v7i2.1002

Abstract

This study aims to analyze the quality of a test instrument using the Rasch model with the assistance of the QUEST software. The analysis was conducted on ten test items developed as a learning evaluation tool. The results showed that only five items received responses from students and could be analyzed quantitatively. These five items demonstrated conformity with the Rasch model, as indicated by INFIT MNSQ values within the acceptable range and OUTFIT t values that met the item fit criteria. The analysis of item difficulty revealed that the instrument contained a range of difficulty levels, including easy, difficult, and very difficult items. However, the item reliability and person reliability values were classified as low, indicating that the consistency of the instrument and the stability of the measurement results were not yet optimal. In addition, several items did not function properly because they did not receive any student responses and therefore lacked empirical validity. Based on these findings, it can be concluded that the developed test instrument does not yet fully meet the criteria of a high-quality learning evaluation tool and still requires improvement, particularly in terms of item quality and instrument reliability.
Co-Authors Agustina, Melinda Ardiansyah, Muhammad Ilham Lestari, Pramesti Ayu Oktaviani, Intan Putri, Khalisah Nabila Putri, Khalishah Nabilla Sundari, Muncar Susanti, Hemalia Suwarto Suwarto