Which of the followinig is true ?

Options

A. Frog has monocular vision .
B. Frog has membrane present al lhc body surface.
C. Frog is myopic (short sighted) on land.
D. All of these are true.

Answer

To determine which of the statements about frogs is true, we will analyze each option provided in the question step by step.

### Step-by-Step Solution:

1. **Analyze the First Statement: "Frog has monolocular vision."**
- Monolocular vision refers to the ability to use both eyes separately. Frogs have their eyes positioned on the sides of their heads, allowing them to see two objects at once. This type of vision increases their field of view but limits depth perception.
- **Conclusion:** This statement is **true**.

2. **Analyze the Second Statement: "Frog has membrane present at body surface."**
- Frogs have various membranes on their body surface, such as the tympanum, which is found in the ear region. This membrane plays a role in hearing.
- **Conclusion:** This statement is also **true**.

3. **Analyze the Third Statement: "Frog is myopic (short-sighted) on land."**
- Myopia means being near-sighted. Frogs are indeed myopic when on land, meaning they can see objects clearly only at a short distance. Their large, round lenses contribute to a wide field of view but do not focus well on distant objects.
- **Conclusion:** This statement is **true**.

4. **Analyze the Fourth Statement: "All of these are true."**
- Since we have established that all the previous statements are true, this statement must also be true.
- **Conclusion:** This statement is **true**.

### Final Answer:
All of the statements provided about frogs are true.