Scottish Highers Human Biology Problem Solving: The photograph shows cars parked

Question

The photograph shows cars parked in a street.

The judgement of distance depends on visual cues.

Explain how the following visual cues allow a person to judge how far away each car is from them in the street.

(i) Size

(ii) Superimposition

(b) State the term used for the ability of the brain to judge the distance of an object based on the different images received by each eye.

(c) Students carried out the following experiment on the judgement of distance.

1. One student raised their right arm and closed both eyes.
2. A coin was randomly placed on the bench in front of them.
3. The student opened both eyes and immediately lowered their arm trying to touch the coin with their index finger.
4. The distance between the coin and the spot where the index finger landed was measured.
5. Steps 1-4 were repeated, firstly only opening the left eye and secondly opening the right eye.
6. Then steps 1-5 were repeated another nine times.

The results are shown in the table.

| Attempt | Distance between coin and spot where finger landed (cm) |
|---------|--------------------------------------------------------|
| 1       | 2 | 4 | 12 |
| 2       | 4 | 8 | 14 |
| 3       | 1 | 6 | 16 |
| 4       | 1 | 8 | 14 |
| 5       | 0 | 5 | 13 |
| 6       | 0 | 7 | 11 |
| 7       | 1 | 10 | 18 |
| 8       | 1 | 7 | 14 |
| 9       | 1 | 8 | 15 |
| 10      | 1 | 8 | 15 |
| Average  | 0.9 | 6.7 | 15.0 |

(i) Calculate the missing distance for attempt 9.

(ii) Suggest a reason why the coin was randomly placed for each attempt.

(iii) The results of the experiment show that two eyes are more accurate than one for judging distance.
State another conclusion which can be drawn from the results.

The photograph shows cars parked in a street - Scottish Highers Human Biology - Question 9 - 2018

Worked Solution & Example Answer:The photograph shows cars parked in a street - Scottish Highers Human Biology - Question 9 - 2018

Size

Superimposition

State the term used for the ability of the brain to judge the distance of an object based on the different images received by each eye.

Calculate the missing distance for attempt 9.

Suggest a reason why the coin was randomly placed for each attempt.

State another conclusion which can be drawn from the results.

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