The amount of water needed daily by plants for photosynthesis, cell growth, and cell maintenance is very small, and yet plants require large volumes of water in order to live. It is estimated that over 90 percent of the water absorbed by plants is lost into the air. Most of the water loss is due to evaporation from the plant through the small openings in leaves called stomata. This loss of water vapor from plants is referred to as transpiration.

The data represent the average transpiration value for twenty plants under each of the six experimental conditions. The room conditions were a temperature of 22°C, fluorescent lighting, and low humidity.

Okay? I believe I don't see any data or question anywhere here except your little introduction.

To calculate the average transpiration value for each experimental condition, you would need the data for the transpiration values of the twenty plants under each condition. From the information given, it is not explicitly mentioned what the experimental conditions are, so it's difficult to provide a specific calculation. However, I can guide you on how to calculate the average transpiration value using the available data.

Here are the general steps to calculate the average transpiration value:

1. Collect the data: Make sure you have the transpiration data for each of the twenty plants under each experimental condition.

2. Sum up the transpiration values: Add up all the transpiration values for a specific experimental condition.

3. Calculate the average: Divide the sum of the transpiration values by the number of plants (in this case, 20) to find the average transpiration value.

4. Repeat steps 2 and 3 for each experimental condition: Perform these calculations for all the different experimental conditions you have data for.

By following the above steps, you can find the average transpiration value for each of the six experimental conditions mentioned.