Which of the following statements are correct with reference to the frog ?
I. Eyes are bulged and covered by nictitating membrane.
II. Membranous tympanum recieves the sound signals.
III. The frog never drinks water.
IV. A pair of nostrils is present above the mouth.

Options

A. I and II
B. III and IV
C. I and IV
D. All of these

Answer

To determine which statements about frogs are correct, let's analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement I: Eyes are bulged and covered by nictitating membrane.**
- **Analysis:** Frogs have bulging eyes that are indeed covered by a nictitating membrane. This membrane serves to protect the eyes and keep them moist while the frog is on land.
- **Conclusion:** This statement is **correct**.

2. **Statement II: Membranous tympanum receives the sound signals.**
- **Analysis:** The tympanum, or eardrum, in frogs is responsible for receiving sound signals. It is a thin membrane that vibrates in response to sound waves, allowing frogs to hear.
- **Conclusion:** This statement is **correct**.

3. **Statement III: The frog never drinks water.**
- **Analysis:** Frogs do not drink water in the traditional sense. Instead, they absorb water through their skin, especially when they are in a moist environment. Thus, the statement that frogs never drink water is misleading.
- **Conclusion:** This statement is **incorrect**.

4. **Statement IV: A pair of nostrils is present above the mouth.**
- **Analysis:** Frogs have a pair of nostrils located above their mouths, which they use for breathing and smelling.
- **Conclusion:** This statement is **correct**.

### Summary of Findings:
- **Correct Statements:** I, II, and IV.
- **Incorrect Statement:** III.

### Final Answer:
The correct statements with reference to the frog are I, II, and IV.