leacl 8t the questions below. 1. True or False. As soon as you obtain your Petri

Question

leacl 8t the questions below. 1. True or False. As soon as you obtain your Petri Dish from last week, you will open the dish to measure the presence of any bacterial growth 2. True or False. When recording the results from last week's bacteria growth, you will measure the diameter of the "zone of inhibition" in centimeters 3. True or False. When you are finished with your bacteria-containing Petri Dish, you may assume it is OK to dispose of it in the regular trash can. 4. Lichens are a type of plant. 5. A portion of the lichen "body" is photosynthetic. _7. In nature, lichens are typically sensitive to poor air quality. 6. You will use methylene blue dye to stain the lichens. 8. When a stained lichen is placed in a clear fluid of any type, it should release all of the dye it had absorbed. 9. When a stained and rinsed lichen disk is placed in a clear chemical test solution, and the solution gets darker, it means the lichen has absorbed that test chemical, (and released the dye). 0. During the lab exercise, each team will be answering questions about some common sources of air pollution.

Explanation / Answer

Ans 1) False – No, the petri plate will not be opened as soon as it is obtained. Opening it immediately leads to contamination and growth of other microbes.

Ans 2) False – The zone of inhibition is measured in millimeters.

Ans 3) False – It is not okay to dispose it off in regular trash can as it might cause spread of infection.

Ans 4) False – They are type of fungi and have tiny, leafless branches which have flat leaf like structures and appears like powder.

Ans 5) False – A part of their body is not photosynthesis but they grow on plants and use the plants as substrate.

Ans 7) True – The lichens are very sensitive to the sulphur dioxide that is present in the air pollution. The air quality is very poor which interferes with mechanism of lichen.

Ans 6) True – Methylene Blue Dye is used for staining the lichen. It helps in the whole process of in-vivo staining.

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