From the provided data, we can see the different concentrations of salt outside the paramecium and the corresponding number of contractions per minute of the contractile vacuole. Here's the provided data in a summarized form:
1. Very high salt concentration: 2 contractions per minute
2. High salt concentration: 8 contractions per minute
3. Medium salt concentration: 15 contractions per minute
4. Low salt concentration: 22 contractions per minute
5. Very low salt concentration: 30 contractions per minute
When this data is represented on a bar graph:
- The x-axis would represent the salt concentration outside the paramecium with categories: Very high, High, Medium, Low, Very low.
- The y-axis would represent the number of contractions per minute.
Each concentration level will have a corresponding bar whose height is proportional to the number of contractions per minute.
Given the values of contractions per minute, we can draw the following conclusions about the bar heights:
- The bar for "Very high" concentration is the shortest, representing 2 contractions per minute.
- The bar for "High" concentration is taller, representing 8 contractions per minute.
- The bar for "Medium" concentration is taller than the "High" but shorter than the "Low", representing 15 contractions per minute.
- The bar for "Low" concentration is even taller, representing 22 contractions per minute.
- The bar for "Very low" concentration is the tallest, representing 30 contractions per minute.
Therefore, the statement "The graph has five bars of equal height" is incorrect. The bars on the graph actually vary in height, corresponding to the number of contractions per minute at each salt concentration. The heights increase as the salt concentration decreases.
