A group of students design an experiment to measure reaction times using a computer-based visual stimulus. When a red screen turns green, each student must press the spacebar as quickly as possible.
The table shows the reaction times in seconds for ten students tested with their dominant hand and their non-dominant hand:
| Student | Dominant hand reaction time (s) | Non-dominant hand reaction time (s) |
|---|---|---|
| 1 | 0.19 | 0.24 |
| 2 | 0.21 | 0.25 |
| 3 | 0.18 | 0.24 |
| 4 | 0.22 | 0.28 |
| 5 | 0.20 | 0.25 |
| 6 | 0.21 | 0.27 |
| 7 | 0.19 | 0.25 |
| 8 | 0.23 | 0.26 |
| 9 | 0.21 | 0.29 |
| 10 | 0.20 | 0.26 |
Find the mode of the reaction times for the dominant hand.
Calculate the median of the reaction times for the dominant hand.
Identify the stimulus in this reaction time test.
Complete the sequence representing a reflex arc for this response:
Stimulus→I→Sensory neurone→Central Nervous System (CNS)→II→Effector→Response \text{Stimulus} \rightarrow \text{I} \rightarrow \text{Sensory neurone} \rightarrow \text{Central Nervous System (CNS)} \rightarrow \text{II} \rightarrow \text{Effector} \rightarrow \text{Response} Stimulus→I→Sensory neurone→Central Nervous System (CNS)→II→Effector→ResponseState the names of structures I and II.
135 exam-style questions on OCR GCSE Biology 3.1 Coordination and control – the nervous system, covering 3.1.1 Structure of the nervous system, 3.1.2 Coordinated response, 3.1.3 The reflex arc, 3.1.4 Structure of the eye, 3.1.5 Defects of the eye, 3.1.6 Structure and function of the brain, 3.1.7 Difficulties of investigating brain function, and 3.1.8 Limitations in treating nervous system damage. Each one has a worked solution and a mark scheme showing where the marks go.