Which of the following is not an example of reflex action?

Options

A. Withdrawal of limb upon touching a hot object
B. Closing of eyes when strong light is flashed across them
C. Watering of mouth on seeing favourite food
D. Walking on a busy road

Answer

To determine which of the following is not an example of reflex action, we first need to understand what reflex action is. Reflex action is an involuntary response to a stimulus that occurs without conscious thought. It is an automatic reaction that happens quickly in response to a specific stimulus.

### Step-by-Step Solution:

1. **Define Reflex Action**: Reflex action is an involuntary and automatic response to a stimulus. It does not require conscious thought and occurs rapidly.

2. **Analyze Each Option**:
- **Option 1: Withdrawal of limb upon touching a hot object**: This is a classic example of reflex action. The body automatically pulls back the limb to avoid injury without conscious thought.
- **Option 2: Closing of eyes when strong light is flashed**: This is also a reflex action. The eyes close automatically to protect themselves from bright light.
- **Option 3: Watering of mouth upon seeing favorite food**: This is an involuntary response as well. The salivary glands produce saliva automatically when we see food we like.
- **Option 4: Walking on a busy road**: This action requires conscious thought and planning. We must be aware of our surroundings and make decisions to avoid danger, which means it is not a reflex action.

3. **Conclusion**: Based on the analysis, the action that is not a reflex action is **walking on a busy road**. This requires conscious thought and planning, unlike the other options.

### Final Answer:
The correct answer is **Option 4: Walking on a busy road**.