For this lab, you will be observing plants in both the light and in the dark. We will be using a familiar indicator, BTB, for this experiment. (Remember the mealworms?) BTB is an indicator of carbon dioxide, a key molecule in both photosynthesis and cellular respiration.
For the first video below, you will want to take notes along in your notebook and make predictions when prompted.
Did you finish your predictions?
Once you are done, go ahead and watch the next video and see what happened when Ms. Crowder performed the experiment:
Why do you think the results were so different? What could have caused those results? At the start of the next class you will be asked two check-in questions. To answer them correctly you will need to know:
How the BTB changed (what color did it turn).
What process occurred inside the plant that caused the change in the BTB?
Where did the CO2 move from? Where did the CO2 move to?
If you cannot answer the questions above then you need to watch the videos again. Be ready to discuss.