Part B

Collecting Data

11. In your lab report, create a data table similar to the model shown below. Allow plenty of space to record your observations of each plant.

12. Check the control and experimental plants each day for one week. Record your observations of each plant in your lab report. Wash your hands after handling each plant to prevent contaminating your results.

Analysis and Conclusions

1. What differences, if any, did you detect in the two plants after one week?

2. Did the plants exposed to cigarette tobacco become infected with the tobacco mosaic virus?

3. Why do you think it was necessary to use tobacco from different brands of cigarettes?

4. What are some of the possible sources of error in the experiment?

5. Greenhouse operators generally do not allow smoking in their greenhouses. Aside from health and safety issues, how might your results support this practice?

Further Inquiry

The tobacco mosaic virus is capable of infecting different species of plants. Design an experiment to determine which of several types of plants are susceptible to the virus.

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