Question

paramecium contractile vacuole contractions
salt concentration outside
paramecium contractions per
minute
very high 2
high 8
medium 15
low 22
very low 30
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:

• Analyze each option:
• Option 1: The contractions per minute values (2, 8, 15, 22, 30) are different, so bars can't be of equal height.
• Option 2: The tallest bar should be for very low concentration (30 contractions per minute), not very high.
• Option 3: The bar for very low concentration (30) is \(30\div15 = 2\) times the height of the bar for medium concentration (15).
• Option 4: The bar for very high concentration (2) is \(2\div30=\frac{1}{15}\) of the bar for very low concentration, not five - times.

Answer:

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