Nocturnal vision is characterized by 

Options

A. more sensitivity, less resolution
B. less sensitivity, high resolution
C. only sensitivity
D. only resolution

Answer

To answer the question "Nocturnal vision is characterized by," we will analyze the characteristics of nocturnal vision, particularly in organisms like cockroaches that exhibit this type of vision.

### Step-by-Step Solution:

1. **Understanding Nocturnal Vision**:
- Nocturnal vision refers to the ability to see in low light conditions, typically at night. This type of vision is crucial for survival in many animals that are active during the night.

2. **Role of Ommatidia**:
- In organisms like cockroaches, nocturnal vision is facilitated by structures called ommatidia. These are the individual units of compound eyes that allow the organism to detect light.

3. **Sensitivity to Light**:
- Ommatidia are designed to be highly sensitive to light, which is essential for seeing in dark environments. This means that nocturnal vision is characterized by **more sensitivity** to light.

4. **Resolution**:
- While ommatidia are sensitive, they provide less resolution compared to the eyes of diurnal (day-active) animals. This means that while they can detect light well, the clarity of the images they produce is not as high.

5. **Conclusion**:
- Therefore, nocturnal vision is characterized by **more sensitivity** to light and **less resolution**. This combination allows nocturnal animals to navigate and find food in the dark.

### Final Answer:
Nocturnal vision is characterized by **more sensitivity and less resolution**.

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