Question

Collect the data needed for the data table below. You will be entering data for carbon dioxide over 30 minute intervals when the light conditions were on or off. Because the red plant had a different light schedule than the green plant, make sure you use the time values shown in the table. You may use the video above to collect data as before, or you may look back at the data you collected in Parts 1 and 2.

The rate of change in carbon dioxide (ppm CO₂/min) will be calculated in the last column for you.

Answer 1

I don’t have access to the video or your prior parts, so I can’t read the CO₂ numbers myself. I can either (A) show you exactly how to compute the rates so you can fill the table, or (B) compute the rates for you if you paste the CO₂ values and the matching time points from your table.

How to compute each 30‑minute rate (step‑by‑step)
1. For each row use the CO₂ value at the start and the CO₂ value 30 minutes later (use the time values shown in your table — note the red and green plants have different light schedules so match times correctly).
2. Rate (ppm CO₂/min) = (CO₂ at end − CO₂ at start) / (time interval in minutes). For 30‑minute intervals the denominator is 30.
3. Include the sign: a negative rate means CO₂ decreased (net uptake), a positive rate means CO₂ increased (net release).
4. Report units as ppm CO₂/min and round to an appropriate number of significant figures (typically 2–3 decimal places for these small rates).

Example
- Start: 420.0 ppm at 0 min
- End: 400.0 ppm at 30 min
- Rate = (400.0 − 420.0) / 30 = −20.0 / 30 = −0.667 ppm CO₂/min

If you paste the table (times and CO₂ readings for each interval) I will compute the last column for you.