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The following graph compares the hearing of humans with the hearing of two flying foxes - VCE - SSCE Biology - Question 25 - 2007 - Paper 1
Question 25
The following graph compares the hearing of humans with the hearing of two flying foxes. The threshold is a measure of sensitivity where the higher the value, the l... show full transcript
Worked Solution & Example Answer:The following graph compares the hearing of humans with the hearing of two flying foxes - VCE - SSCE Biology - Question 25 - 2007 - Paper 1
Step 1
A. It is more difficult for a human to hear the sound if it has a frequency of 1 kHz than if it has a frequency of 10 kHz.
Answer
The graph indicates that at 1 kHz, the threshold for humans is higher than at 10 kHz, meaning that more sound is needed for the human to hear in the lower frequency range. Therefore, this statement is true.
Step 2
B. A grey-headed flying fox can hear the sound at 10 kHz better than the little red flying fox.
Answer
According to the graph, the threshold for the grey-headed flying fox at 10 kHz is lower than that of the little red flying fox. This confirms that the grey-headed flying fox has better sensitivity at this frequency, making this statement true.
Step 3
C. A grey-headed flying fox hears all sounds better than the little red flying fox whatever the frequency of the sound.
Answer
This statement cannot be confirmed as true for all frequencies based on the graph. While the grey-headed flying fox appears to hear better at some frequencies, this does not hold for all sound frequencies, making this statement false.
Step 4
D. At frequencies below 1 kHz, humans have more difficulty hearing the sound than both flying foxes.
Answer
The graph shows that at frequencies below 1 kHz, the threshold for humans is significantly higher than that of both flying foxes. This indicates that humans generally have more difficulty hearing sounds in this range compared to the flying foxes, making this statement true.