Question

paramecium contractile vacuole contractions
sat concentration outside paramecium\tcontractions per minute
very high\t2
high\t8
medium\t15
low\t22
very low\t30
if this data is shown in a bar graph, which description accurately represents the bars?
the graph has five bars of equal height
the bars range from tallest for very high concentration to shortest for very low concentration
the bar for very low concentration is twice the height of the bar for medium concentration
the bar for very high concentration is five times the height of the bar for very low concentration

Explanation:

Step1: Analyze the data

The data has 5 rows for different salt - concentration levels outside paramecium and the corresponding contractions per minute. The values are 2 (very high), 8 (high), 15 (medium), 22 (low), 30 (very low).

Step2: Evaluate each option

• Option 1: The values are different, so the bars won't be of equal height.
• Option 2: The bar for very high concentration (2) is the shortest and for very low concentration (30) is the tallest, so this is incorrect.
• Option 3: The bar for very low concentration (30) is 30/15 = 2 times the height of the bar for medium concentration (15). This option is correct.
• Option 4: The bar for very high concentration (2) is 2/30 = 1/15 of the height of the bar for very low concentration, not five times.

Answer:

C. The bar for very low concentration is twice the height of the bar for medium concentration.