Which one of the following statement is correct

Options

A. Albumen covering eggs of frog swells and forms protective jelly after coming in contact with water
B. Fertilization in rabbit is helped by hyaluronidase which is present in eggs
C. During fertilization in rabbit the entire sperm including tail enters egg
D. In case of toad, fertilization takes place in moist soil

Explanation

To determine which statement is correct among the given options regarding human reproduction and fertilization, we can analyze each option step by step.

### Step-by-Step Solution:

1. **Analyze Option A**: "Albumin covering, eggs of frog, swells and forms protective jelly after coming in contact with water."
- This statement is true. When frog eggs come into contact with water, the albumin (a protein) in the egg swells and forms a protective jelly-like layer around the egg, which helps in protecting it from environmental factors.

2. **Analyze Option B**: "Fertilization in rabbit is helped by an enzyme hyaluronidase which is present in eggs."
- This statement is false. Hyaluronidase is an enzyme produced by sperm, not eggs. It helps the sperm penetrate the outer layers of the egg during fertilization.

3. **Analyze Option C**: "During fertilization in rabbit, the entire sperm including tail enters eggs."
- This statement is also false. In rabbits, only the head of the sperm enters the egg; the tail does not enter.

4. **Analyze Option D**: "In case of toad, fertilization takes place in moist cell."
- This statement is incorrect. Toads typically undergo external fertilization, which occurs in water, not in moist cells.

5. **Conclusion**: Since options B, C, and D are incorrect, the only correct statement is option A.

### Final Answer:
The correct statement is **Option A**: "Albumin covering, eggs of frog, swells and forms protective jelly after coming in contact with water."

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