Use the data you collected from the experiment you designed and any other data you believe is relevant from other groups in the class to address the following questions:
1. What significant changes in gas pressure did you measure during your experiment, and what did they indicate?
2. What plant specimens did you use and where in them was cellular differentiation taking place? If you believe differentiation did not take place, explain why.
3. What evidence for this differentiation did you observe? Explain at least two reasons why you believe that differentiation occurred?
4. Why might rates of respiration vary at different times in direct correlation to the morphology present?
5. What advantages do organisms that undergo differentiation have over those that do not?
6. Choose an animal that undergoes metamorphosis and design a lab that would demonstrate that metamorphic change was indeed taking place.
7. What might differences in metabolic rates between related species at the same developmental stages signify?
8. How could you use your experimental protocol to study the evolution of organisms?
9. Carbon dioxide probes record the concentration of CO2
molecules in a closed system instead of the pressure of the gas.
If you had used this kind of sensor instead of a gas pressure probe in
the experiment you just performed, what kinds of data would you have expected
to collect? Graph these hypothetical results and explain what these results
mean and why you would have gotten them.
10. A scientist studying respiration removes a coleoptile from a sprouting bean seed. She then snips off its apical tip and places it in a respirometer (A) to measure its metabolic rate. She then puts the remaining coleoptile tissue (minus apical tip) in another respirometer (B) and attaches both respirometers to gas pressure probes (similar to the ones you used) to test how fast the two tissues samples consume oxygen respectively. The scientist collects her results and publishes them.
. Your task is to predict what the results were of the scientist's experiment and draw a graph of the sorts of data you think were collected (be sure to label your graph appropriately). Explain why you think the scientist got these results, and then identify what the dependent and independent variables were in the original experiment.