Tag Archives: lab experiment

Photosynthesis and Respiration

Welcome back from the October break! I know you’re all excited to be back in class after a week of sleeping in and lazing around with your friends and families. Hopefully, the following lab experiment will ease everyone back into the routine of school…

The processes of photosynthesis and respiration are essentially inverse reactions. Photosynthesis uses carbon dioxide and water as reactants to produce glucose and oxygen gas. Respiration uses glucose and oxygen gas as reactants to produce carbon dioxide and water. The only difference is that photosynthesis requires an input of light energy to drive the reaction, energy which is stored in the C-H bonds of the glucose molecules produced.

Here you will find the instructions for Lab 31C Photosynthesis-Respiration (CO2 and O2), which I originally planned for the day we return from the break. Unfortunately, most of the science department order has not yet arrived, including our new oxygen sensors, which means we don’t have enough equipment for everyone to get to do the lab. But thanks to modern technology, we can still run the lab virtually! Open the document and read the questions and extensions after the procedure and data tables. These should help guide your thinking with the photosynthesis/respiration labs you’re designing on your own.

Photosynthesis-respiration lab setup. Screen capture image from Vernier Loggerpro.

Photosynthesis-respiration lab setup. Screen capture image from Vernier LoggerPro software.

Planning the Photosynthesis and Respiration Lab

I’ll add more later, but for the moment, please use this lab report planner to develop the investigation you will design into photosynthesis and respiration in Philodendron hastatum and Sansevieria trifasciata.

Below is a link to the planner as a Google form. When you complete the planner and click ‘submit,’ I will receive a digital version of your responses, which means I can then quickly see what you’re planning for your investigation and give you some timely feedback in class. ***Please note that you must be signed in to your IST Gmail account in order to see and use the planner form!

Click on the following link to download a MS Word version of the planner. It covers all parts of the lab report process in MYP science and is a little more detailed than the embedded Google form above. Photosynthesis-Respiration Lab Report Planner

Photosynthesis Experiment #7

Sansevieria trifasciata

Sansevieria trifasciata

This week in grade 9 science, we’ll start the process of developing your investigations into photosynthesis and respiration in Sansevieria trifasciata and Philodendron hastatum plants. The first steps of that process are a couple of preliminary experiment to establish an understanding of these essential processes.

Philodendron hastatum

Philodendron hastatum

The experiment below is the one we’ll be doing in class on Thursday and Friday of this week. Please make sure you’ve read all the way through the procedure before we start in the lab!

You will submit digital versions of the data tables and the analysis questions for homework after you’ve finished this experiment. You may send them via email.