CISM Science Guild Participates in the 2nd Philippine Biology Olympiad 2019: SISID

Ateneo de Manila University (ADMU) hosted the 2nd Philippine Biology Olympiad (PBO) 2Ol9: Sisid last February 23 to 24, 2O19 at the AdMU Campus in Quezon City. A total of 370 participants from 98 high schools all over the Philippines arrived at the Ateneo de Manila University campus to join the two-day program of Philippine Biology Olympiad (PBO) 2019: SISID which determined the country’s four delegates to compete at the International Biology Olympiad (IBO) in Szeged, Hungary. Two major events were Quiz Bee and the Laboratory Skills. Supplementary activities were poster making, facilitated big group discussions, symposiums, and amazing race as the culminating activity. All these activities aim to foster camaraderie among participants, enhance the students’ interest, passion, and awareness on issues in specific learning area in the Biological Sciences.

Four (4) students from our school participated in this year’s PBO 2019: SISID:
Brian Martin Muñoz (Grade 7MS)
Deniz Dagtas (Grade 10AG)
Annika Laude (Grade 10AG)
Matthew Lawrence Tan (G11PB)

Congratulations to these four amazing students who actively participated and indeed gave their best in the said event. You have proved that success isn’t always measured in numbers. It is measured by the strong will, the breadth of your hopes and the way you handle challenges along the way. Special thanks to my co-moderator and CISM’s MS Science teacher, Ms. Madhumita Saini and to the entire Science Team. Kudos!

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“Visking” Tubing Experiment

The human body is a complex system that consists of varying organ structures working and indefatigably functioning in sync together to maintain equilibrium, thus, to sustain life.

IB DP Year 2 students took their first on-hand experiment on digestion, called “Visking Tubing Experiment”. One of the best ways to learn and understand the processes that take place in the body is by modelling. This experiment provides a visual way of demonstrating diffusion through a semi-permeable membrane. It was used to model the human gut as well as to investigate the effect of the enzyme called amylase on starch. Two standard macromolecule tests were done. The first test done is called the Iodine Test. It is done to determine the presence of starch in certain foods or substance. The second test done was the Benedict’s test, which is used to test for the presence of reducing sugars, such as glucose.
The Visking Tubing Experiment set-up

Benedict’s solution, used to test for the reducing or simple sugars.

Iodine solution, used to test for starch. A blue-black color results if starch is present. Otherwise, the original brown color will will be retained.

All samples were taken and were submerged in hot water bath. Benedict’s reagent starts out aqua-blue in color. As it is heated in the presence of reducing sugars, it turns yellow, green, orange or brick-red. The final color of the reagent signifies the concentration of reducing sugar. Brick red signifies a high concentration of glucose.

Iodine solution

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